Login

GPC Members Login
If you have any problems or have forgotten your login please contact [email protected]


A vaccine for edible plants? A new plant protection method on the horizon

Novel technologies are being sought to replace the traditional pesticides used to protect plants, particularly edible plants such as cereals. A new collaborative project between the University of Helsinki and the French National Centre for Scientific Research (CNRS) is shedding light on the efficacy of environmentally friendly RNA-based vaccines that protect plants from diseases and pests.

Plant diseases and pests cause considerable crop losses and threaten global food security. The diseases and pests have traditionally been fought with chemical pesticides, which spread throughout our environment and may be hazardous to human health, beneficial organisms and the environment.

"A new approach to plant protection involves vaccinating plants against pathogens with double-stranded RNA molecules that can be sprayed directly on the leaves," explains Dr Minna Poranen of the Molecular and Integrative Biosciences Research Programme at the University of Helsinki's Faculty of Biological and Environmental Sciences.

The vaccine triggers a mechanism known as RNA interference, which is an innate defence mechanism of plants, animals and other eukaryotic organisms against pathogens. The vaccine can be targeted to the chosen pathogen by using RNA molecules which share sequence identity with the pest's genes and prevents their expression.

This means that the double-stranded RNA molecules do not affect the expression of genes in the protected plant, but only target the plant disease or pest. RNA is also a common molecule in nature that degrades rapidly rather than building up in the environment.

"The challenge in developing RNA-based vaccines to protect plants has involved the production of RNA molecules. Double-stranded RNA molecules have been produced through chemical synthesis, both as drug molecules and for research purposes, but such production methods are inefficient and expensive for plant protection," Poranen states.

As part of the Academy of Finland's Synthetic Biology Research Programme, Poranen's group has developed a new production method for double-stranded RNA molecules. Together with researchers at the CNRS, the group has demonstrated the efficacy of RNA-based vaccines produced using the new method against plant virus infections. The method utilises the RNA amplification system of a bacteriophage, i.e. a bacteria-destroying virus, and the RNA production takes place in bacterial cells. This new method will enable the effective production of RNA-based vaccines and promote the development and adoption of RNA-based plant protection methods.

"It's difficult to predict when the vaccine will be made available because no relevant legislation exists yet," Poranen says.

Read the paper: Synthetic biology approach for plant protection using dsRNA.

Article source: University of Helsinki.

Image credit: oticki / Fotolia

News

Algae have land genes

500 million years ago, the first plants living in water took to land. The genetic adaptations associated with this transition can already be recognized in the genome of Chara braunii, a species of freshwater algae. An international research team headed by Marburg biologist Stefan Rensing reports on this in the journal Cell.


Rice plants evolve to adapt to flooding

Although water is essential for plant growth, excessive amounts can waterlog and kill a plant. In South and Southeast Asia, where periodic flooding occurs during the rainy season, the water depth can reach several meters for many months.


Invasive plants adapt to new environments, study finds

Invasive plants have the ability to adapt to new environments - and even behave like a native species, according to University of Stirling research.