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plant science Archives - Page 78 of 84 - The Global Plant Council

Sep 24
2

Large-scale genomics will improve the yield, climate-resilience, and quality of bread wheat, new study shows

By | Future Directions, News, Plant Science, Research

Scientists identified significant new chromosomal regions for wheat yield and disease resistance, which will speed up global breeding efforts.

Using the full wheat genome map published in 2018, combined with data from field testing of wheat breeding lines in multiple countries, an international team of scientists has identified significant new chromosomal regions for wheat yield and disease resistance and created a freely-available collection of genetic information and markers for more than 40,000 wheat lines.

Reported in Nature Genetics, the results will speed up global efforts to breed more productive and climate-resilient varieties of bread wheat, a critical crop for world food security that is under threat from rising temperatures, rapidly-evolving fungal pathogens, and more frequent droughts, according to Philomin Juliana, wheat scientist at the International Maize and Wheat Improvement Center (CIMMYT) and first author of the new study.

“This work directly connects the wheat genome reference map with wheat lines and extensive field data from CIMMYT’s global wheat breeding network,” said Juliana. “That network in turn links to over 200 breeding programs and research centers worldwide and contributes to yield and other key traits in varieties sown on nearly half the world’s wheat lands.”

The staple food for more than 2.5 billion people, wheat provides 20% of human dietary calories and protein worldwide and is critical for the nutrition and food security of hundreds of millions of poor persons in regions such as North Africa and South Asia.

“Farmers and societies today face new challenges to feed rising and rapidly-urbanizing populations, and wheat epitomizes the issues,” said Ravi Singh, CIMMYT wheat breeder and corresponding author of the study. “Higher temperatures are holding back yields in major wheat-growing areas, extreme weather events are common, crop diseases are spreading and becoming more virulent, and soil and water are being depleted.”

Juliana said the study results help pave the way to apply genomic selection, an approach that has transformed dairy cow husbandry, for more efficient wheat breeding.

“Molecular markers are getting cheaper to use; meanwhile, it’s very costly to do field testing and selection involving many thousands of wheat plants over successive generations,” Juliana said. “Genome-wide marker-based selection can help breeders to precisely identify good lines in early breeding generations and to test plantlets in greenhouses, thereby complementing and streamlining field testing.”

The new study found that genomic selection could be particularly effective in breeding for wheat end-use quality and for resistance to stem rust disease, whose causal pathogen has been evolving and spreading in the form of highly-virulent new races.

The new study also documents the effectiveness of the global public breeding efforts by CIMMYT and partners, showing that improved wheat varieties from this work have accumulated multiple gene variants that favor higher yields, according to Hans-Joachim Braun, director of CIMMYT’s global wheat program.

“This international collaboration, which is the world’s largest publicly-funded wheat breeding program, benefits farmers worldwide and offers high-quality wheat lines that are released directly to farmers in countries, such as Afghanistan, that are unable to run a full-fledged wheat breeding program,”

Braun explained.

The study results are expected to support future gene discovery, molecular breeding, and gene editing in wheat, Braun said.

Together with more resource-efficient cropping systems, high-yielding and climate-resilient wheat varieties will constitute a key component of the sustainable intensification of food production described in Strategy 3 of the recent EAT-Lancet Commission recommendations to transform the global food system. Large-scale genomics will play a key role in developing these varieties and staying ahead of climate- and disease-related threats to food security.

Read the paper: Nature Genetics

Article source: CIMMYT

Image: Apollo Habtamu/CIMMYT

Sep 23
0
saisies

Daisies that close at night have camouflaged petals to protect them from herbivores

By | News, Plant Science

Species of daisy that close their flowers at night, produce colour in their exposed lower petals that makes them harder to spot for herbivores, reducing herbivory rates of flowers. The findings are presented in the British Ecological Society journal Functional Ecology.

Researchers from Stellenbosch University, South Africa found that tortoises, one of the main herbivores of the daisies, were unable to distinguish the lower petal surfaces against a green leaf background. Tortoises prefer to eat protein-rich flowers over leaves, but when confronted with closed flowers, they showed no preference between them.

When the researchers modelled the colours of the lower petal surfaces in the vision of other herbivores, they also found these colours to be indistinguishable from leaves.

In contrast, species of daisy that do not close at night produced the same colouration on their lower petals as the upper petals exposed to pollinators.

Plants face an evolutionary conflict between having flowers that attract pollinators while avoiding herbivores. Often plants defend themselves chemically, but this can have adverse effects on pollination.

“When plants defend their flowers chemically, the pollination interactions can be negatively influenced. Our study shows a novel way in which flowers can avoid herbivores, without compromising pollination interactions.

– says Dr. Jurene Kemp, lead author of the study.

“These flowers can potentially circumvent the conflict of attracting both pollinators and herbivores by producing attractive colours on the surfaces that are exposed to pollinators (when flowers are open) and cryptic colours that are exposed when herbivores are active (when flowers are closed).”

In Namaqualand, South Africa, where the research took place, daises bloom annually in a spring flowering. This makes preserving flowers, responsible for reproduction, particularly important.

The researchers examined the colouration of 77 Asteraceae species, modelling how they appear in the visual systems of chameleons, horses and goats as proxies for tortoises and larger herbivores in the area, like springbok. They then tested the preferences of real tortoises with both open and closed flowers against leaf backgrounds.

Not all Asteraceae species that close their flowers had cryptically coloured lower petal surfaces, but in the experiments, the tortoises did not readily eat these flowers. Dr. Kemp said, “One interesting question would be to test whether non-cryptic flowers have chemical defences, and whether these chemical defences are absent in the cryptic flowers.”

On further research Dr. Kemp said “Unfortunately, we could only do this using one plant family in one botanical region, it would be great to see if other plant species also use colour to avoid herbivores.”

The researchers would also have liked to use larger herbivores such as springboks in their behavioural experiments, but Dr. Kemp adds that “this was practically not possible.”

Read the paper: Functional Ecology

Article source: British Ecological society Press Office

Image: Jurene Kemp


Jul 19
0

These algae can live inside fungi. It could be how land plants first evolved.

By | MSU-DOE Plant Research Laboratory, News, Plant Science

Picture a typical documentary scene on the evolution of life. It probably starts with little bugs in a murky, primordial soup. Eons of time zip by as bugs turn into fish, fish swim to land as their fins morph into limbs for crawling animals, which then stand up on two legs, to finally end up with walking humans.

The picture is very animal-centric. But what about plants? They also made the jump from water to land. Scientists think that green algae are their water-living ancestors, but we are not sure how the transition to land plants happened.

New research from Michigan State University, and published in the journal eLife, presents evidence that algae could have piggybacked on fungi to leave the water and to colonize the land, over 500 million years ago.

“Fungi are found all over the planet. They create symbiotic relationships with most land plants. That is one reason we think they were essential for evolution of life on land. But until now, we have not seen evidence of fungi internalizing living algae,” says Zhi-Yan Du, study co-author and member of the labs of Christoph Benning, and now, Gregory Bonito.

Researchers selected a strain of soil fungus and marine alga from old lineages, respectively Mortierella elongata and Nannochloropsis oceanica.

When grown together, both organisms form a strong relationship.

“Microscopy images show the algal cells aggregating around and attaching to fungal cells,” Du says. “The algal wall is slightly broken down, and its fibrous extensions appear to grab the surface of the fungus.”

Surprisingly, when they are grown together for a long time – around a month – some algal cells enter the fungal cells. Both organisms remain active and healthy in this relationship.

This is the first time scientists have seen fungi internalize a expand iconeukaryotic, photosynthetic organism. They call it a ‘photosynthetic mycelium’.

“Both organisms get additional benefits from being together,” Du says. “They exchange nutrients, with a likely net flow of carbon from alga to fungus, and a net flow of nitrogen in the other direction. Interestingly, the fungus needs physical contact with living algal cells to get nutrients. Algal cells don’t need physical contact or living fungus to benefit from the interaction. Fungal cells, dead or alive, release nutrients in their surroundings.”

“Even better, when nutrients are scarce, algal and fungal cells grown together fend off starvation by feeding each other. They do better than when they are grown separately.”

Perhaps this increased hardiness explains how algae survived the trek onto land.

“In nature, similar symbiotic events might be going on, more than we realize,” Du adds. “We now have a system to study how a expand iconphotosynthetic organism can live inside a non-photosynthetic one and how this symbiosis evolves and functions.”

Both organisms are biotech related strains because they produce high amounts of oil. Du is testing them as a platform to produce high-value compounds, such as biofuels or Omega 3 fatty acids.

“Because the two organisms are more resilient together, they might better survive the stresses of bioproduction,” Du says. “We could also lower the cost of harvesting algae, which is a large reason biofuel costs are still prohibitive.”

Read the paper: eLife

Article source: MSU-DOE Plant Research Laboratory

Image: Zhi-Yan Du, colored by Igor Houwat; from eLife

Jun 06
1

An economist’s perspective on plant sciences: Under-appreciated, over-regulated and under-funded

By | Blog, Future Directions

David Zilberman

Modified crops such as Golden Rice could have major benefits for people in developing nations. Image credit: IRRI Licensed under CC BY 2.0

By David Zilberman, Professor and Robinson Chair, Agriculture and Resource Economics, UC Berkeley

When I started working on agronomical issues in the 1970s, the most exciting technologies were related to water, machinery, and harvesting. Plant genetics seemed to be quite a boring enterprise. But as I became familiar with the Green Revolution, I realized the importance of plant research, and that the golden rule in agriculture is to find the optimal mixture between biotic and abiotic technologies. As an economist working on technology, I started to realize that the past fifty years have drastically changed the way plant sciences are done, and the potential and value of their product.

The discovery of the innerworkings of a cell, combined with the power of computers and precision tools, has changed medicine, but it has perhaps the potential to make an even bigger impact on plant sciences and agriculture. I have been working on the economics and policy aspects of agricultural biotechnology (see also Journal of Economic Perspectives).  Despite the restrictions on genetically modified varieties, they increase yields and make food more affordable for the poor. They also reduce greenhouse gas emissions and actually improved human health (by reducing exposure to chemicals and aflatoxin). But biotechnologies have had limited impact because of regulations that limit their use mostly to feed and fiber crops, and the practical ban on use of GMOs in Europe and parts of Africa.

It’s clear that developing countries can be the major beneficiaries of these technologies. They can save billions of dollars and address severe health and malnourishment problems. Furthermore, applications of biotechnology on food crops can reduce food security problems and increase access to valuable fresh produce throughout the world. Modern biotechnology can provide tools to accelerate adaptation to climate change, and I am surprised that some of the organizations most aware of climate change don’t recognize the value of biotechnology to address it.

Plant science research has already made major achievements using traditional and advanced tools to provide better varieties and improve the global food situation in a world with a fast growing population. There is a large body of literature documenting the rate of return of research, and much of the achievements have been the development of new varieties. The literature suggests that public research that provided much of the benefit has been underfunded, and its funding is declining. Thus, plant research hasn’t reached its potential.

Thus far, applied research in plant sciences at many universities concentrate on grasses, like corn and wheat, but underemphasize trees and algae. One explanation to the emphasis on grasses is the immediate economic benefits they seem to provide. With all the modern tools of biology, the big challenges and some of the most radical and relevant knowledge can come from the study of trees and algae within the context of forest and oceans. Studies of these specimens will enhance our understanding of living systems, is crucially important from a macro-ecological perspective, and from a practical perspective of finding new materials, new foods and efficient sources of energy.

Poplar is one of the most commonly used trees in plant science research. Image credit: Walter Siegmund 

I believe that society tends to underinvest in plant sciences, both because science is underfunded in general and because of the regulations of biotechnology that limit their use, as mentioned above. The contribution of plant scientists to address problems of climate change, deforestation, food security, and environmental quality are under-emphasized and under-recognized. This leads to less investment in this area, less contribution, and less student interest. But more investment in plant sciences may provide better understanding of their impact and how to regulate them, and provide more promising applications. So we are in a vicious cycle of over-regulation and under-funding that mostly hurt regions and populations that are vulnerable, and reduce our capabilities to deal with global changes.

To move forward, we need to have more enlightened regulations that will allow us to take advantage of this incredible science and big jolts in terms of support for research in plant sciences. Enlightened regulations would balance benefits and risks, reduce the cost of access to modern biotechnologies. They also would allow efficient and mutually beneficial transfer of knowledge and genetic materials across locations. Plant sciences is one discipline where the distribution of efforts across locations globally can be especially beneficial as we can learn about the performance of plant systems throughout the world. Therefore, investments in plant sciences should be distributed globally. For example, a major effort to raise funding for 100 Chairs of Plant Sciences around the world, especially in developing countries, will be a good start. It should be associated with support for student research, as well as forums the exchange of new ideas. And finally, new investments in arboretums and greenhouses.

Plant sciences have been providing humanity essential knowledge that enabled the growth and evolution of human civilization without much fanfare. New tools increase its potential and the excitement and value of research in these areas. Society needs to expand their support to plant sciences to enable it to flourish around the world, as well as enlightened regulation to gain benefits from the fruits of this research.

May 16
0

When lipids meet hormones: plants’ answer to complex stresses

By | Blog, Research

This blog has been reposted with permission from the MSU-DOE Plant Research Laboratory.

Unlike animals, plants can’t run away when things get bad. That can be the weather changing or a caterpillar starting to slowly munch on a leaf. Instead, they change themselves inside, using a complex system of  hormones, to adapt to challenges.

Now, MSU-DOE Plant Research Laboratory scientists are connecting two plant defense systems to how these plants do photosynthesis. The study, conducted in the labs of Christoph Benning and Gregg Howe, is in the journal, The Plant Cell.

At the heart of this connection is the chloroplast, the engine of photosynthesis. It specializes in producing compounds that plants survive with. But plants have evolved ways to use it for other, completely unrelated purposes.

Their trick is to harvest their own chloroplasts’ protective membranes, made of  lipids, the molecules found in fats and oils. Lipids have many uses, from making up cell boundaries, to being part of plant hormones, to storing energy.

If plants need lipids for some purpose other than serving as membranes, special proteins break down chloroplast membrane lipids. Then, the resulting products go to where they need to be for further processing.

For example, one such protein, breaks down lipids that end up in plant seed oil. Plant seed oil is both a basic food component and a precursor for biodiesel production.

Now, Kun (Kenny) Wang, a former Benning lab grad student, reports two more such chloroplast proteins with different purposes. Their lipid breakdown products help plants turn on their defense system against living pests and other herbivores. In turn, the proteins, PLIP2 and PLIP3, are themselves activated by another defense system against non-living threats.

Playing the telephone game inside plants

In a nutshell, the plant plays a version of the popular children’s game, Telephone, with itself. In the real game, players form a line. The first person whispers a message into the ear of the next person in the line, and so on, until the last player announces the message to the entire group.

In plants, defense systems and chloroplasts also pass along chemical messages down a line. Breaking it down:

  1. The plant senses non-living threats, like cold or drought, and indicates it through one hormone (ABA)
  2. This alarm triggers the two identified proteins to breakdown lipids from the chloroplast membrane
  3. The lipid products turn into another hormone (JA) which takes part in the insect defense system. Plant growth slows to a crawl. Energy goes to producing defensive chemicals.

“The cross-talk between defense systems has a purpose. For example, there is mounting evidence that plants facing drought are more vulnerable to caterpillar attacks,” Kenny says. “One can imagine plants evolving precautionary strategies for varied conditions. And the cross-talk helps plants form a comprehensive defense strategy.”

Kenny adds, “The chloroplast is amazing. We suspect its membrane lipids spur functions other than defense or oil production. That implies more Telephone games leading to different ends we don’t know yet. We have yet to properly examine that area.”

“Those functions could help us better understand plants and engineer them to be more resistant to complex stresses.”

Moving on to Harvard Medical School

Kenny recently got his PhD from the MSU Department of Biochemistry and Molecular Biology. He has just started a post-doc position in the Farese-Walther lab at Harvard Medical School.

“They look at lipid metabolism in mammals and have started a project connecting it with brain disease in humans,” Kenny says. “There is increasing evidence that problems with lipid metabolism in the brain might lead to dementia, Alzheimer’s, etc.”

“I benefited a lot from my time at MSU. The community is very successful here: the people are nice, and you have support from colleagues and facilities. Although we scientists should sometimes be independent in our work, we also need to interact with our communities. No matter how good you are, there is a limit to your impact as an individual. That is one of the lessons I applied when looking for my post-doc.”

Photo of the author, Kun (Kenny) Wang. By Kenny Wang

Read the original article here.

Jan 24
0

Reflections from the “Feed the Future” conference in Burkina Faso

By | Blog, Research

By Atsuko Kanazawa, Igor Houwat, Cynthia Donovan

This article is reposted with permission from the Michigan State University team. You can find the original post here: MSU-DOE Plant Research Laboratory

By Atsuko Kanazawa

Atsuko Kanazawa is a plant scientist in the lab of David Kramer. Her main focus is on understanding the basics of photosynthesis, the process by which plants capture solar energy to generate our planet’s food supply.

This type of research has implications beyond academia, however, and the Kramer lab is using their knowledge, in addition to new technologies developed in their labs, to help farmers improve land management practices.

One component of the lab’s outreach efforts is its participation in the Legume Innovation Lab (LIL) at Michigan State University, a program which contributes to food security and economic growth in developing countries in Sub-Saharan Africa and Latin America.

Atsuko recently joined a contingent that attended a LIL conference in Burkina Faso to discuss legume management with scientists from West Africa, Central America, Haiti, and the US. The experience was an eye opener, to say the least.

To understand some of the challenges faced by farmers in Africa, take a look at this picture, Atsuko says.

“When we look at corn fields in the Midwest, the corn stalks grow uniformly and are usually about the same height,” Atsuko says. “As you can see in this photo from Burkina Faso, their growth is not even.”

“Soil scientists tell us that much farmland in Africa suffers from poor nutrient content. In fact, farmers sometimes rely on finding a spot of good growth where animals have happened to fertilize the soil.”

Even if local farmers understand their problems, they often find that the appropriate solutions are beyond their reach. For example, items like fertilizer and pesticides are very expensive to buy.

That is where USAID’s Feed the Future and LIL step in, bringing economists, educators, nutritionists, and scientists to work with local universities, institutions, and private organizations towards designing best practices that improve farming and nutrition.

Atsuko says, “LIL works with local populations to select the most suitable crops for local conditions, improve soil quality, and manage pests and diseases in financially and environmentally sustainable ways.”

Unearthing sources of protein

At the Burkina Faso conference, the Kramer lab reported how a team of US and Zambian researchers are mapping bean genes and identifying varieties that can sustainably grow in hot and drought conditions.

The team is relying on a new technology platform, called PhotosynQ, which has been designed and developed in the Kramer labs in Michigan.

PhotosynQ includes a hand-held instrument that can measure plant, soil, water, and environmental parameters. The device is relatively inexpensive and easy to use, which solves accessibility issues for communities with weak purchasing power.

The heart of PhotosynQ, however, is its open-source online platform, where users upload collected data so that it can be collaboratively analyzed among a community of 2400+ researchers, educators, and farmers from over 18 countries. The idea is to solve local problems through global collaboration.

Atsuko notes that the Zambia project’s focus on beans is part of the larger context under which USAID and LIL are functioning.

“From what I was told by other scientists, protein availability in diets tends to be a problem in developing countries, and that particularly affects children’s development,” Atsuko says. “Beans are cheaper than meat, and they are a good source of protein. Introducing high quality beans aims to improve nutrition quality.”

Science alone is sometimes not enough

But, as LIL has found, good science and relationships don’t necessarily translate into new crops being embraced by local communities.

Farmers might be reluctant to try a new variety, because they don’t know how well it will perform or if it will cook well or taste good. They also worry that if a new crop is popular, they won’t have ready access to seed quantities that meet demand.

Sometimes, as Atsuko learned at the conference, the issue goes beyond farming or nutrition considerations. In one instance, local West African communities were reluctant to try out a bean variety suggested by LIL and its partners.

The issue was its color.

“One scientist reported that during a recent famine, West African countries imported cowpeas from their neighbors, and those beans had a similar color to the variety LIL was suggesting. So the reluctance was related to a memory from a bad time.”

This particular story does have a happy ending. LIL and the Burkina Faso governmental research agency, INERA, eventually suggested two varieties of cowpeas that were embraced by farmers. Their given names best translate as, “Hope,” and “Money,” perhaps as anticipation of the good life to come.

Another fruitful, perhaps more direct, approach of working with local communities has been supporting women-run cowpea seed and grain farms. These ventures are partnerships between LIL, the national research institute, private institutions, and Burkina Faso’s state and local governments.

Atsuko and other conference attendees visited two of these farms in person. The Women’s Association Yiye in Lago is a particularly impressive success story. Operating since 2009, it now includes 360 associated producing and processing groups, involving 5642 women and 40 men.

“They have been very active,” Atsuko remarks. “You name it: soil management, bean quality management, pest and disease control, and overall economic management, all these have been implemented by this consortium in a methodical fashion.”

“One of the local farm managers told our visiting group that their crop is wonderful, with high yield and good nutrition quality. Children are growing well, and their families can send them to good schools.”

As the numbers indicate, women are the main force behind the success. The reason is that, usually, men don’t do the fieldwork on cowpeas. “But that local farm manager said that now the farm is very successful, men were going to have to work harder and pitch in!”

Back in Michigan, Atsuko is back to the lab bench to continue her photosynthesis research. She still thinks about her Burkina Faso trip, especially how her participation in LIL’s collaborative framework facilitates the work she and her colleagues pursue in West Africa and other parts of the continent.

“We are very lucky to have technologies and knowledge that can be adapted by working with local populations. We ask them to tell us what they need, because they know what the real problems are, and then we jointly try to come up with tailored solutions.”

“It is a successful model, and I feel we are very privileged to be a part of our collaborators’ lives.”

This article is reposted with permission from the Michigan State University team. You can find the original post here: MSU-DOE Plant Research Laboratory

Oct 11
0

Taking the brakes off plant production: not so good after all

By | Blog, Research

Reposted with kind permission from the MSU-DOE Plant Research Laboratory. Original article.

By: Igor Houwat, Atsuko Kanazawa, David Kramer

The need for speed: increasing plant yield is one way to increase food and fuel resources. But asking plants to simply do more of the usual is a strategy that can backfire. Photo by Romain Peli on Unsplash

When engineers want to speed something up, they look for the “pinch points”, the slowest steps in a system, and make them faster.

Say, you want more water to flow through your plumbing. You’d find the narrowest pipe and replace it with a bigger one.

Many labs are attempting this method with  photosynthesis, the process that plants and algae use to capture solar energy.

All of our food and most of our fuels have come from photosynthesis. As our population increases, we need more food and fuel, requiring that we improve the efficiency of photosynthesis.

But, Dr. Atsuko Kanazawa and the Kramer Lab are finding that, for biological systems, the “pinch point” method can potentially do more harm than good, because the pinch points are there for a reason!  So, how can this be done?

 

ATP synthase: an amazing biological nanomachine

Atsuko and her colleagues at the MSU-DOE Plant Research Laboratory (PRL) have been working on this problem for over 15 years. They have focused on a tiny machine in the  chloroplast called the  ATP synthase, a complex of proteins essential to storing solar energy in “high energy molecules” that power life on Earth.

That same ATP molecule and a very similar ATP synthase are both used by animals, including humans, to grow, maintain health, and move.

In plants, the ATP synthase happens to be one of the slowest process in photosynthesis, often limiting the amount of energy plants can store.

Photosynthetic systems trap sunlight energy that starts the reaction to move electrons forward in an assembly-line fashion to make useful energy compounds. The ATP synthase is one of the “pinch points” that slows the flow as needed, so plants stay healthy. In cfq, the absence of feedback leads to an electron pile up at PSI, and a crashed system. By MSU-DOE Plant Research Laboratory, except tornado graphic/CC0 Creative Commons

 

Kicking up the gears of plant production

Atsuko thought, if the ATP synthase is such an important pinch point, what happens if it were faster? Would it be better at photosynthesis and give us faster growing plants?

Years ago, she got her hands on a mutant plant, called cfq, from a colleague. “It had an ATP synthase that worked non-stop, without slowing down, which was a curious example to investigate. In fact, under controlled laboratory conditions – very mild and steady light, temperature, and water conditions – this mutant plant grew bigger than its wild cousin.”

But when the researchers grew the plant under the more varied conditions it experiences in real life, it suffered serious damage, nearly dying.

“In nature, light and temperature quality change all the time, whether through the passing hours, or the presence of cloud cover or winds that blow through the leaves,” she says.

 

Plants slow photosynthesis for a reason!

Recent innovations from the Kramer lab are enabling Atusko and her colleagues to probe into how real environmental conditions affect plant growth.

Atsuko’s research now shows that the slowness of the ATP synthase is not an accident; it’s an important braking mechanism that prevents photosynthesis from producing harmful chemicals, called reactive oxygen species, which can damage or kill the plant.

“It turns out that sunlight can be damaging to plants,” says Dave Kramer, Hannah Distinguished Professor and lead investigator in the Kramer lab.

“When plants cannot use the light energy they are capturing, photosynthesis backs up and toxic chemicals accumulate, potentially destroying parts of the photosynthetic system. It is especially dangerous when light and other conditions, like temperature, change rapidly.”

“We need to figure out how the plant presses on the brakes and tune it so that it responds faster…”

The ATP synthase senses these changes and slows down light capture to prevent damage. In that light, the cfqmutant’s fast ATP is a bad idea for the plant’s well-being.

“It’s as if I promised to make your car run faster by removing the brakes. In fact, it would work, but only for a short while. Then things go very wrong!” Dave says.

“In order to improve photosynthesis, what we need is not to remove the brakes completely, like in cfq, but to control them better,” Dave says. “Specifically, we need to figure out how the plant presses on the brakes and tune it so that it responds faster and more efficiently,” David says.

Atsuko adds: “Scientists are trying different methods to improve photosynthesis. Ultimately, we all want to tackle some long-term problems. Crucially, we need to continue feeding the Earth’s population, which is exploding in size.”

The study is published in the journal, Frontiers in Plant Science.

 

Oct 06
1

Potatoes, allies on Earth and on Mars

By | Blog, Future Directions

By
Zoraida Portillo (Perú)

[LIMA] A joint initiative between NASA and the International Potato Centre (CIP), which is based in Peru, offers scientific evidence that it is possible to grow at least four types of potatoes on Mars.

A scenario starring the root crop was portrayed in the movie “The Martian” (2015), in which a lost astronaut, played by Matt Damon, survives on potatoes he cultivates on the red planet while awaiting rescue.

But in addition to this interplanetary possibility, scientists also observed the crop is genetically suited to adapting to the changes creating more adverse environmental conditions on Earth.

So before turning fiction into reality, the tuber has a mission on Earth.

The hardy potato quartet

The study has identified four types of potatoes, out of 65 examined, which have shown resistance to high salinity conditions and were able to form tubers in a type of soil similar to that on Mars.
One of these is the Tacna variety, developed in Peru in 1993. It was introduced to China shortly afterwards, where it showed high tolerance to droughts and saline soils with hardly any need for irrigation.

This variety became so popular in China that it was ‘adopted’ in 2006 under the name of Jizhangshu 8. The same high tolerance was seen on the saline and arid soils of Uzbekistan, a country with high temperatures and water shortages, where the variety was also introduced and renamed as Pskom.

The second variety that passed the salinity test is being cultivated in coastal areas of Bangladesh that have high salinity soils and high temperatures. The other two types are promising clones — potatoes that are being tested for attributes that would make them candidates for becoming new varieties.

These four potato types were created as a result of the CIP’s breeding programme to encourage adaptation to conditions in subtropical lowlands, such as extreme temperatures, which are expected to be strongly affected by climate change.

Down to Earth

In addition to these four potato ‘finalists’, other clones and varieties have shown promising results when tested in severe environmental conditions. The findings offer researchers new clues about the genetic traits that can help tubers cope with severe weather scenarios on Earth.

“It was a pleasant surprise to see that the potatoes that we have improved to tolerate adverse conditions were able to produce tubers on this soil [soil similar to that on Mars],” says Walter Amorós, CIP potato breeder and one of the five researchers involved in the project, who has studied potatoes for more than 30 years.

According to Alberto García, adviser to the UN Food and Agriculture Organization in Peru who is in charge of food security programmes, this experiment “serves to verify that potato, a produce of great nutritional value, is a crop extremely adaptable to the worst conditions”, something that is very relevant for current climate scenarios.

García stresses that global temperatures are now rising at a rate higher than expected, affecting not only potatoes but also other crops. Many now need to be cultivated at higher altitudes — which, he says, is not always a disadvantage and may even be beneficial for crops that were previously cultivated in valleys.

“But it can also have negative consequences that we have to anticipate,” adds García. Therefore, he says this experiment can inspire others to think about future scenarios and look for other crops than can adapt to extreme conditions that will have an impact on agriculture.

Similar to Mars

The project began with a search for soils similar to that found on Mars. Julio Valdivia-Silva, a Peruvian researcher who worked at NASA’s Ames Research Center, eventually concluded that the soil samples collected in the Pampas de la Joya region of southern Peru were the most similar to Martian soil.

Arid, sterile and formed by volcanic rocks, these soil samples were extremely saline.

Helped by engineers from the University of Engineering and Technology (UTEC) in Lima and based on designs by NASA’s Ames Research Center, the CIP built CubeSat — a miniature satellite that recreates, in a confined environment, a Martian-like atmosphere. This is where the potatoes were cultivated.

“If potatoes could tolerate the extreme conditions to which we exposed them in our CubeSat, they have a good opportunity to develop on Mars,” says Valdivia-Silva.

They then conducted several rounds of experiments to find out which varieties could better withstand the extreme conditions, and what minimum conditions each crop needed to survive.

CubeSat, hermetically sealed, housed a container with La Joya soil, where each one of the tubers was cultivated. CubeSat itself supplied water and nutrients, controlled the temperature according to that expected at different times on Mars, and also regulated the planet’s pressure, oxygen and carbon dioxide levels.

Cameras were installed to record the process, broadcasting developments on the soil and making it possible to see the precise moment in which potatoes sprouted.

Based on the results, CIP scientists say that in order to grow potatoes on Mars, space missions will have to prepare the soil so it has a loose structure and contains nutrients that allow the tubers to obtain enough oxygen and water.

In a next phase of the project, the scientists hope to expose successful varieties to more extreme environmental conditions. This requires, among other things, developing a prototype satellite similar to CubeSat that can replicate more extreme conditions with greater precision, at a price tag of US$ 100,000.

This piece was produced by SciDev.Net’s Latin America and Caribbean desk.

This article was originally published on SciDev.Net. Read the original article.

Aug 07
1

Fighting Fusarium wilt to beat the bananapocalypse

By | Blog, Research

Dr. Sarah Schmidt (@BananarootsBlog), Researcher and Science Communicator at The Sainsbury Laboratory Science. Sarah got hooked on both banana research and science writing when she joined a banana Fusarium wilt field trip in Indonesia as a Fusarium expert. She began blogging at https://bananaroots.wordpress.com and just filmed her first science video. She speaks at public events like the Pint of Science and Norwich Science Festival.

 

Every morning I slice a banana onto my breakfast cereal.

And I am not alone.

Every person in the UK eats, on average, 100 bananas per year.

Bananas are rich in fiber, vitamins, and minerals like potassium and magnesium. Their high carbohydrate and potassium content makes them a favorite snack for professional sports players; the sugar provides energy and the potassium protects the players from muscle fatigue. Every year, around 5000 kg of bananas are consumed by tennis players at Wimbledon.

But bananas are not only delicious snacks and handy energy kicks. For around 100 million people in Sub-Saharan Africa, bananas are staple crops vital for food security. Staple crops are those foods that constitute the dominant portion of a standard diet and supply the major daily calorie intake. In the UK, the staple crop is wheat. We eat wheat-based products for breakfast (toast, cereals), lunch (sandwich), and dinner (pasta, pizza, beer).

In Uganda, bananas are staple crops. Every Ugandan eats 240 kg bananas per year. That is around 7–8 bananas per day. Ugandans do not only eat the sweet dessert banana that we know; in the East African countries such as Kenya, Burundi, Rwanda, and Uganda, the East African Highland banana, called Matooke, is the preferred banana for cooking. Highland bananas are large and starchy, and are harvested green. They can be cooked, fried, boiled, or even brewed into beer, so have very similar uses wheat in the UK.

In West Africa and many Middle and South American countries, another cooking banana, the plantain, is cooked and fried as a staple crop.

In terms of production, the sweet dessert banana we buy in supermarkets is still the most popular. This banana variety is called Cavendish and makes up 47% of the world’s banana production, followed by Highland bananas (24%) and plantains (17%). Last year, I visited Uganda and I managed to combine the top three banana cultivars in one dish: cooked and mashed Matooke, a fried plantain and a local sweet dessert banana!

 

Three types of banana in a single dish in Uganda.

Another important banana cultivar is the sweet dessert banana cultivar Gros Michel, which constitutes 12% of the global production. Gros Michel used to be the most popular banana cultivar worldwide until an epidemic of Fusarium wilt disease devastated the banana export plantations in the so-called “banana republics” in Middle America (Panama, Honduras, Guatemala, Costa Rica) in the 1950s.

Fusarium wilt disease is caused by the soil-borne fungus Fusarium oxysporum f. sp. cubense (FOC). The fungus infects the roots of the banana plants and grows up through the water-conducting, vascular system of the plant. Eventually, this blocks the water transport of the plant and the banana plants start wilting before they can set fruits.

Fusarium Wilt symptoms

Fusarium Wilt symptoms

The Fusarium wilt epidemic in Middle America marked the rise of the Cavendish, the only cultivar that could be grown on soils infested with FOC. The fact that they are also the highest yielding banana cultivar quickly made Cavendish the most popular banana variety, both for export and for local consumption.

Currently, Fusarium wilt is once again the biggest threat to worldwide banana production. In the 1990s, a new race of Fusarium wilt – called Tropical Race 4 (TR4) – occurred in Cavendish plantations in Indonesia and Malaysia. Since then, TR4 has spread to the neighboring countries (Taiwan, the Philippines, China, and Australia), but also to distant locations such as Pakistan, Oman, Jordan, and Mozambique.

Current presence of Fusarium wilt Tropical Race 4. Affected countries are colored in red.

In Mozambique, the losses incurred by TR4 amounted to USD 7.5 million within just two years. Other countries suffer even more; TR4 causes annual economic losses of around USD 14 million in Malaysia, USD 121 million in Indonesia, and in Taiwan the annual losses amount to a whopping USD 253 million.

TR4 is not only diminishing harvests. It also raises the price of production, because producers have to implement expensive preventative measures and treatments of affected plantations. These preventive measures and treatments are part of the discussion at The World Banana Forum (WBF). The WBF is a permanent platform for all stakeholders of the banana supply chain, and is housed by the United Nation’s Food and Agricultural Organization (FAO). In December 2013, the WBF created a special taskforce to deal with the threat posed by TR4.

Despite its massive impact on banana production, we know very little about the pathogen that is causing Fusarium wilt disease. We don’t know how it spreads, why the new TR4 is so aggressive, or how we can stop it.

Fusarium Wilt symptom

Fusarium Wilt symptoms in the discolored banana corm.

Breeding bananas is incredibly tedious, because edible cultivars are sterile and do not produce seeds. I am therefore exploring other ways to engineer resistance in banana against Fusarium wilt. As a scientist in the 2Blades group at The Sainsbury Laboratory, I am investigating how we can transfer resistance genes from other crop species into banana and, more recently, I have been investigating bacteria that are able to inhibit the growth and sporulation of F. oxysporum. These biologicals would be a fast and cost-effective way of preventing or even curing Fusarium wilt disease.

 

Twitter:           @BananarootsBlog

Email:              mailto:sarah.schmidt@tsl.ac.uk

Website:          https://bananaroots.wordpress.com

Jul 31
0

Chinese plant science and Journal of Experimental Botany

By | Blog, Scientific Meetings, SEB

This week’s post was written by Jonathan Ingram, Senior Commissioning Editor / Science Writer for the Journal of Experimental Botany. Jonathan moved from lab research into publishing and communications with the launch of Trends in Plant Science in 1995, then going on to New Phytologist and, in the third sector, Age UK and Mind.

 In this week of the XIXth International Botanical Congress (IBC) in Shenzhen, it seems appropriate to highlight outstanding research from labs in China. More than a third of the current issue of Journal of Experimental Botany is devoted to papers from labs across this powerhouse of early 21st century plant science.

Collaborations are key, and this was a theme that came up time again at the congress. The work by Yongzhe Gu et al. is a fine example, involving scientists at four institutions studying a WRKY gene in wild and cultivated soybean: in Beijing, the State Key Laboratory of Systematic and Evolutionary Botany at the Institute of Botany in the Chinese Academy of Sciences, and the University of the Chinese Academy of Sciences; and in Harbin (Heilongjiang), the Crop Tillage and Cultivation Institute at Heilongjiang Academy of Agricultural Sciences, and the College of Agriculture at Northeast Agricultural University. Interest here centers on the changes which led to the increased seed size in cultivated soybean with possible practical application in cultivation and genetic improvement of such a vital crop.

Crops and gardens

Botanic gardens are also part of the picture. In another paper in the same issue, Yang Li et al. from the Key Laboratory of Tropical Plant Resources and Sustainable Use at Xishuangbanna Tropical Botanical Garden in Kunming (Yunnan) and the University of the Chinese Academy of Sciences in Beijing present research on DELLA-interacting proteins in Arabidopsis. Here the authors show that bHLH48 and bHLH60 are transcription factors involved in GA-mediated control of flowering under long-day conditions.

IBC 2017

Naturally, research on rice is important. Wei Jiang et al. from the National Key Laboratory of Crop Genetic Improvement, Huazhong Agricultural University (Wuhan) describe their research on WOX11 and the control of crown root development in the nation’s grain of choice, which will be important for breeders looking to increase crop yields and resilience.

The other work featured is either in Arabidopsis or plants of economic importance: Fangfang Zheng et al. (Qingdao Agricultural University, also with collaborators in Maryland) and Xiuli Han et al. (Beijing); Yun-Song Lai et al. (Beijing/Chengdu – cucumber), Wenkong Yao et al. (Yangling, Shaanxi – Chinese grapevine, Vitis pseudoreticulata), and Xiao-Juan Liu et al. (Tai-an, Shandong – apple).

Development of plant science

Shenzehn has grown rapidly and is now highly significant for life science as home to the China National GeneBank (CNGB) project led by BGI Genomics. The vision as set out by Huan-Ming Yang, chairman of BGI-Shenzhen, is profound – from sequencing what’s already here, often in numbers per species, to innovative synthetic biology.

Shenzehn is also home to another significant institution, the beautiful and scientifically important Fairy Lake Botanic Garden. At the IBC, the importance of biodiversity conservation for effective, economically focused plant science, but also for so many other reasons to do with our intimate relationship with plants and continued co-existence on the planet, was a central theme.

The research highlighted in Journal of Experimental Botany is part of the wider, positive growth of plant science (and, indeed, botany) not just in China, but worldwide. The Shenzehn Declaration on Plant Sciences with its seven priorities for strategic action, launched at the congress, will be a guide for the right development in coming years.