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2016 Plant Science Round Up

By | Blog, Research

Another fantastic year of discovery is over – read on for our 2016 plant science top picks!

January

Zostera marina

A Zostera marina meadow in the Archipelago Sea, southwest Finland. Image credit: Christoffer Boström (Olsen et al., 2016. Nature).

The year began with the publication of the fascinating eelgrass (Zostera marina) genome by an international team of researchers. This marine monocot descended from land-dwelling ancestors, but went through a dramatic adaptation to life in the ocean, in what the lead author Professor Jeanine Olsen described as, “arguably the most extreme adaptation a terrestrial… species can undergo”.

One of the most interesting revelations was that eelgrass cannot make stomatal pores because it has completely lost the genes responsible for regulating their development. It also ditched genes involved in perceiving UV light, which does not penetrate well through its deep water habitat.

Read the paper in Nature: The genome of the seagrass Zostera marina reveals angiosperm adaptation to the sea.

BLOG: You can find out more about the secrets of seagrass in our blog post.

 

February 

Plants are known to form new organs throughout their lifecycle, but it was not previously clear how they organized their cell development to form the right shapes. In February, researchers in Germany used an exciting new type of high-resolution fluorescence microscope to observe every individual cell in a developing lateral root, following the complex arrangement of their cell division over time.

Using this new four-dimensional cell lineage map of lateral root development in combination with computer modelling, the team revealed that, while the contribution of each cell is not pre-determined, the cells self-organize to regulate the overall development of the root in a predictable manner.

Watch the mesmerizing cell division in lateral root development in the video below, which accompanied the paper:


Read the paper in Current Biology: Rules and self-organizing properties of post-embryonic plant organ cell division patterns.

 

March

In March, a Spanish team of researchers revealed how the anti-wilting molecular machinery involved in preserving cell turgor assembles in response to drought. They found that a family of small proteins, the CARs, act in clusters to guide proteins to the cell membrane, in what author Dr. Pedro Luis Rodriguez described as “a kind of landing strip, acting as molecular antennas that call out to other proteins as and when necessary to orchestrate the required cellular response”.

Read the paper in PNAS: Calcium-dependent oligomerization of CAR proteins at cell membrane modulates ABA signaling.

*If you’d like to read more about stress resilience in plants, check out the meeting report from the Stress Resilience Forum run by the GPC in coalition with the Society for Experimental Biology.*

 

April

Arbuscular mycorrhizal fungi.

This plant root is infected with arbuscular mycorrhizal fungi. Image credit: University of Zurich.

In April, we received an amazing insight into the ‘decision-making ability’ of plants when a Swiss team discovered that plants can punish mutualist fungi that try to cheat them. In a clever experiment, the researchers provided a plant with two mutualistic partners; a ‘generous’ fungus that provides the plant with a lot of phosphates in return for carbohydrates, and a ‘meaner’ fungus that attempts to reduce the amount of phosphate it ‘pays’. They revealed that the plants can starve the meaner fungus, providing fewer carbohydrates until it pays its phosphate bill.

Author Professor Andres Wiemsken explains: “The plant exploits the competitive situation of the two fungi in a targeted manner, triggering what is essentially a market-based process determined by cost and performance”.

Read the paper in Ecology Letters: Options of partners improve carbon for phosphorus trade in the arbuscular mycorrhizal mutualism.

 

May

The transition of ancient plants from water onto land was one of the most important events in our planet’s evolution, but required a massive change in plant biology. Suddenly plants risked drying out, so had to develop new ways to survive drought.

In May, an international team discovered a key gene in moss (Physcomitrella patens) that allows it to tolerate dehydration. This gene, ANR, was an ancient adaptation of an algal gene that allowed the early plants to respond to the drought-signaling hormone ABA. Its evolution is still a mystery, though, as author Dr. Sean Stevenson explains: “What’s interesting is that aquatic algae can’t respond to ABA: the next challenge is to discover how this hormone signaling process arose.”

Read the paper in The Plant Cell: Genetic analysis of Physcomitrella patens identifies ABSCISIC ACID NON-RESPONSIVE, a regulator of ABA responses unique to basal land plants and required for desiccation tolerance.

 

June

Knoblauch with phloem

Professor Michael Knoblauch shows off a microscope image of phloem tubes. Image credit: Washington State University.

Sometimes revisiting old ideas can pay off, as a US team revealed in June. In 1930, Ernst Münch hypothesized that transport through the phloem sieve tubes in the plant vascular tissue is driven by pressure gradients, but no-one really knew how this would account for the massive pressure required to move nutrients through something as large as a tree.

Professor Michael Knoblauch and colleagues spent decades devising new methods to investigate pressures and flow within phloem without disrupting the system. He eventually developed a suite of techniques, including a picogauge with the help of his son, Jan, to measure tiny pressure differences in the plants. They found that plants can alter the shape of their phloem vessels to change the pressure within them, allowing them to transport sugars over varying distances, which provided strong support for Münch flow.

Read the paper in eLife: Testing the Münch hypothesis of long distance phloem transport in plants.

BLOG: We featured similar work (including an amazing video of the wound response in sieve tubes) by Knoblauch’s collaborator, Dr. Winfried Peters, on the blog – read it here!

 

July

Ancient barley grain

Preserved remains of rope, seeds, reeds and pellets (left), and a desiccated barley grain (right) found at Yoram Cave in the Judean Desert. Credit: Uri Davidovich and Ehud Weiss.

In July, an international and highly multidisciplinary team published the genome of 6,000-year-old barley grains excavated from a cave in Israel, the oldest plant genome reconstructed to date. The grains were visually and genetically very similar to modern barley, showing that this crop was domesticated very early on in our agricultural history. With more analysis ongoing, author Dr. Verena Schünemann predicts that “DNA-analysis of archaeological remains of prehistoric plants will provide us with novel insights into the origin, domestication and spread of crop plants”.

Read the paper in Nature Genetics: Genomic analysis of 6,000-year-old cultivated grain illuminates the domestication history of barley.

BLOG: We interviewed Dr. Nils Stein about this fascinating work on the blog – click here to read more!

 

August

Another exciting cereal paper was published in August, when an Australian team revealed that C4 photosynthesis occurs in wheat seeds. Like many important crops, wheat leaves perform C3 photosynthesis, which is a less efficient process, so many researchers are attempting to engineer the complex C4 photosynthesis pathway into C3 crops.

This discovery was completely unexpected, as throughout its evolution wheat has been a C3 plant. Author Professor Robert Henry suggested: “One theory is that as [atmospheric] carbon dioxide began to decline, [wheat’s] seeds evolved a C4 pathway to capture more sunlight to convert to energy.”

Read the paper in Scientific Reports: New evidence for grain specific C4 photosynthesis in wheat.

 

September

CRISPR lunch

Professor Stefan Jansson cooks up “Tagliatelle with CRISPRy fried vegetables”. Image credit: Stefan Jansson.

September marked an historic event. Professor Stefan Jansson cooked up the world’s first CRISPR meal, tagliatelle with CRISPRy fried vegetables (genome-edited cabbage). Jansson has paved the way for CRISPR in Europe; while the EU is yet to make a decision about how CRISPR-edited plants will be regulated, Jansson successfully convinced the Swedish Board of Agriculture to rule that plants edited in a manner that could have been achieved by traditional breeding (i.e. the deletion or minor mutation of a gene, but not the insertion of a gene from another species) cannot be treated as a GMO.

Read more in the Umeå University press release: Umeå researcher served a world first (?) CRISPR meal.

BLOG: We interviewed Professor Stefan Jansson about his prominent role in the CRISPR/GM debate earlier in 2016 – check out his post here.

*You may also be interested in the upcoming meeting, ‘New Breeding Technologies in the Plant Sciences’, which will be held at the University of Gothenburg, Sweden, on 7-8 July 2017. The workshop has been organized by Professor Jansson, along with the GPC’s Executive Director Ruth Bastow and Professor Barry Pogson (Australian National University/GPC Chair). For more info, click here.*

 

October

Phytochromes help plants detect day length by sensing differences in red and far-red light, but a UK-Germany research collaboration revealed that these receptors switch roles at night to become thermometers, helping plants to respond to seasonal changes in temperature.

Dr Philip Wigge explains: “Just as mercury rises in a thermometer, the rate at which phytochromes revert to their inactive state during the night is a direct measure of temperature. The lower the temperature, the slower phytochromes revert to inactivity, so the molecules spend more time in their active, growth-suppressing state. This is why plants are slower to grow in winter”.

Read the paper in Science: Phytochromes function as thermosensors in Arabidopsis.

 

November

Ginkgo

A fossil ginkgo (Ginkgo biloba) leaf with its modern counterpart. Image credit: Gigascience.

In November, a Chinese team published the genome of Ginkgo biloba¸ the oldest extant tree species. Its large (10.6 Gb) genome has previously impeded our understanding of this living fossil, but researchers will now be able to investigate its ~42,000 genes to understand its interesting characteristics, such as resistance to stress and dioecious reproduction, and how it remained almost unchanged in the 270 million years it has existed.

Author Professor Yunpeng Zhao said, “Such a genome fills a major phylogenetic gap of land plants, and provides key genetic resources to address evolutionary questions [such as the] phylogenetic relationships of gymnosperm lineages, [and the] evolution of genome and genes in land plants”.

Read the paper in GigaScience: Draft genome of the living fossil Ginkgo biloba.

 

December

The year ended with another fascinating discovery from a Danish team, who used fluorescent tags and microscopy to confirm the existence of metabolons, clusters of metabolic enzymes that have never been detected in cells before. These metabolons can assemble rapidly in response to a stimulus, working as a metabolic production line to efficiently produce the required compounds. Scientists have been looking for metabolons for 40 years, and this discovery could be crucial for improving our ability to harness the production power of plants.

Read the paper in Science: Characterization of a dynamic metabolon producing the defense compound dhurrin in sorghum.

 

Another amazing year of science! We’re looking forward to seeing what 2017 will bring!

 

P.S. Check out 2015 Plant Science Round Up to see last year’s top picks!

The Secrets of Seagrass

By | Blog, Future Directions
Zosteramarina

Zostera marina. Public domain, via Wikimedia Commons.

It’s the ancient story of plant evolution: photosynthetic algae moved to damp places on land, eventually evolving more complex architecture, and spreading across almost all terrestrial habitats. To cope with the drier conditions, plants developed roots to absorb water, and vascular tissue to transport it; a waxy cuticle coating their surfaces to prevent evaporation; and microscopic pores called stomata that open to allow carbon dioxide to diffuse in for photosynthesis but close to prevent excessive water loss.

How, then, does eelgrass (Zostera marina) fit in to this tale? It’s a monocot descended from the flowering plants, but it has turned its back on dry land and returned to the sea; a rare feat that only appears to have happened on three occasions. The recent sequencing of the eelgrass genome has revealed several interesting insights into the dramatic genetic changes that have allowed it to adapt to what lead author Professor Jeanine Olsen described as, “arguably the most extreme adaptation a terrestrial (and even a freshwater) species can undergo.”

Sayonara to stomata

If you live in the sea, conserving water isn’t your main concern. Eelgrass was known to lack stomata, but genetic comparisons to other species, including its freshwater relative Spirodela polyrhiza, revealed the first surprise of the study: eelgrass has lost not only its stomata but also the genes involved in their development and patterning. “The genes have just gone, so there’s no way back to land for seagrass,” said Olsen.

A difference in defense

When angiosperms are attacked by herbivores or pathogens, their defense response typically involves the release of volatile secondary metabolites through their stomata. How can eelgrass release these compounds without stomata? The answer is: it doesn’t. The genome study found that eelgrass is missing crucial genes involved in making ethylene (an important hormone release in times of stress), as well as those responsible for producing non-metabolic terpenoids, which act to repel pests.

Selective pressures of the marine environment differ greatly from those of terrestrial habitats, so different pathways may be involved. Second, eelgrass has a wide repertoire of pathogen resistance genes, which suggests that it is exposed to a very different set of pathogens that may not respond to typical immune responses. Third, volatile secondary metabolites are often involved in attracting pollinators; this is not believed to be necessary in eelgrass, where submarine pollination occurs using the water itself.

Zostera marina. Public domain, CC0 1.0.

Zostera marina – National Museum of Nature and Science, Tokyo. Public domain, CC0 1.0, via WikiMedia Commons.

Changing the cell wall

Eelgrass is subject to extremely salty conditions, and it’s had to adapt to osmotic stress. Unlike typical plant cell walls, eelgrass has engineered its cell wall matrix to retain water in the cell wall, even during low tide. This involves depositing sulfated polysaccharides and low methylated pectins in the cell wall matrix, but until its genome was sequenced no-one knew exactly how. It turns out that eelgrass has rearranged its metabolic pathways: “They have re-engineered themselves,” Olsen explains.

Living with a lack of light

Some species of Zostera can grow in water 50m deep, where light levels are reduced and shifted into a narrow wavelength range; ultraviolet (UV), red and far-red light have particularly low penetration after the first 1–2m of seawater. In a classic eelgrass ‘use it or lose it’ response, it has lost the UVR8 gene, which is responsible for sensing and responding to UV damage, as well as the phytochromes associated with red and far-red receptors. It does, however, retain the photosynthetic machinery, including photosystems I and II.

Unravelling angiosperm evolution

The recent eelgrass publication has revealed how this plant has either lost or adapted typical angiosperm traits to suit its needs, by ditching its stomata, volatile secondary metabolites and certain light sensing genes, or by altering the structure and function of the cell wall. It also developed adaptations that enable gas exchange, help pollen stick to submerged stigmas, and promote nutrient uptake.

Could these adaptations be useful in crop breeding? While a lack of defense compounds would probably be a step backwards, it would be extremely useful to understand how eelgrass copes with biotic stresses without them. Removing light receptors would also be problematic, but could eelgrass help us to develop crops that can grow in shaded conditions, perhaps in intercropping systems? What can we learn from eelgrass’ nutrient uptake and salt-tolerant adaptations?

Now that we have seen some of the secrets of eelgrass, how can we best make use of them?

 

Read the paper: The genome of the seagrass Zostera marina reveals angiosperm adaptation to the sea (Open Access)

Read the editorial: Genomics: From sea to sea (paywall)

Read the press release: Genome of the flowering plant that returned to the sea

 

“So what does the Global Plant Council actually do?” – SEB Prague 2015

By | ASPB, Blog, GPC Community, Scientific Meetings, SEB

Dobrý den!

 View across the Vltava river of Prague's Old Town and the Charles Bridge.


View across the Vltava river of Prague’s Old Town and the Charles Bridge.

Last week I attended the Society for Experimental Biology (SEB)’s Annual Main Meeting in the wonderful city of Prague in the Czech Republic.

Armed with a banner, a new batch of hot-off-the-press leaflets, some of our infamous GPC recycled paper pens, and a map of the world, the purpose of my trip was to staff an exhibitor’s booth at the conference to help raise awareness of the GPC and the projects and initiatives we are involved with.

2015-07-03 09.50.14To encourage delegates to speak to the exhibitors, there was a chance to win prizes in exchange for a ‘passport’ filled with stickers or stamps collected from each of the booths. This gave me a fantastic opportunity to meet people from all over the world and tell them about the Global Plant Council – even the SEB’s Animal and Cell biologists!

Many visitors to the booth were from Europe, but I also met people from as far away as Argentina, Australia, China and Vietnam. Thanks to everyone who visited the booth and gave me their email addresses to sign up for our monthly e-Bulletin newsletter!

“So what does the Global Plant Council actually do?”

This was the question I was most frequently asked at the conference. The answer is: many things! But to simplify matters, our overall remit falls into two main areas.

1) Enabling better plant science

2015-07-03 09.50.39

Visitors to our booth at SEB 2015 were asked to put their plant science on the map!

Plant science has a critical role to play in meeting global challenges such as food security, hunger and malnutrition. The GPC currently has 29 member organizations, including the SEB, representing over 55,000 plant, crop, agricultural and environmental scientists around the world. By bringing these professional organizations together under a united global banner, we have a stronger voice to help influence and shape policy and decision-making at the global level.  Our Executive Board and member organization representatives meet regularly and feed into international discussions and consultations.

The GPC also aims to facilitate more effective and efficient plant-based scientific research. Practically speaking, this means we organize, promote, provide support for, and assist with internationally collaborative projects and events. A good example is the Stress Resilience Symposium and Discussion Forum we are hosting, together with the SEB, in Brazil in October.

This meeting – which will be a satellite meeting of the International Plant Molecular Biology 2015 conference – will bring together scientists from across the world who are studying the mechanisms by which plants interact with and respond to their environments, particularly in the face of climate change. It will provide an excellent opportunity for researchers of all levels and from different regions to network and learn from each other, fostering new relationships and collaborations across borders. Registration and abstract submission is now open, so why not come along!

Importantly, as well as learning from researchers all over the world about the fantastic research they are doing, we also want to identify important research that is not being done, or which could be done better. Then, we can come together to discuss strategies to fund and fill these gaps.

You can find out more about our other current initiatives by going to our website.

2) Enabling better plant scientists

2015-07-03 12.42.41As well as physically bringing people together at meetings and events, the Global Plant Council aims to better connect plant scientists from around the world, promote plant research and funding opportunities, share knowledge and best practice, and identify reports, research tools, and educational resources.

Plant scientists have created an amazing diversity of assets for research and education, so by facilitating access to and encouraging use of these resources, we hope that a desperately needed new generation of plant researchers will be inspired to continue working towards alleviating some of the world’s most pressing problems. For example, we’re translating plant science teaching materials into languages other than English, and are helping the American Society of Plant Biologists to curate content for Plantae.org, an online resource hub and gathering place for the plant science community that will be launched later this year – stay tuned!

My #SEBSelfie! Other updates from the meeting can be found by following the hashtag #SEBAMM on Twitter.

My #SEBSelfie! Other updates from the meeting can be found by following the hashtag #SEBAMM on Twitter.

In addition, the GPC website is full of useful information including research and funding news, an events calendar, reports and white papers, fellowships and awards. We operate a Twitter account (@GlobalPlantGPC) for up-to-the-minute news and views, and a Spanish version @GPC_EnEspanol. We also have a blog (obviously!) that is regularly updated with interesting and informative articles written by the GPC staff, our two New Media Fellows, and plant scientists from across our member network. A Facebook page will be coming soon!

If you would like any more information about the projects and initiatives mentioned here, or more details about the GPC’s work, please do contact me (Lisa Martin, Outreach & Communications Manager): lisa@globalplantcouncil.org.

 

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