This research increases understanding of the ability of these fungi to infect numerous plants. Study of the genomes will eventually lead to new methods in an integrated battle against the two major pathogens. All results have been published in the online edition of Plos Genetics of 18 August 2011.
White and gray mold rot are two diseases that affect agricultural plants (sunflower, onion, grapevine, tomato, colza, etc.) both during cultivation and after harvesting. They are caused by microscopic fungi, respectively Sclerotinia sclerotiorum and Botrytis cinerea. The two very closely related species quickly kill plant cells during infection, facilitating colonization of dead tissues; they are known as necrotrophic pathogens.
Both in France and around the world, white and gray mold rot has resulted in considerable economic losses and significant production costs related to the application of fungicidal treatments. New regulations also require finding alternatives to the use of chemicals. In this context, improved understanding of the strategies these fungi use to infect plants is essential.
To compare S. sclerotiorum and B. cinerea and better understand the strategies used in pathogenesis, sequencing of their genomes, which are highly similar, was completed by Genoscope (CEA, France) and the Broad Institute (USA) with the help of a consortium of international laboratories led by INRA. Analysis of their genes shows that they have an impressive arsenal of enzymes with which they can easily decompose the pectin on which they live. This characteristic is related to the fact that they develop essentially on the aerial parts and fruit of plants that are rich in pectin (colza, grapevine, strawberry). Most genes associated with the infection are similar in the two species, including those involved in plant cell wall degradation.
There are also significant differences. There are twice as many secondary metabolism genes, i.e., those involved in the production of bioactive molecules (toxins, signaling components and antibiotics), in B. cinerea as there are in S. sclerotiorum. This diversity may lead to various infectious mechanisms (necrosis-inducing toxins in Botrytis). The two species also differ in their mode of sexual reproduction, S. sclerotiorum is self-fertile (homothallism) while B. cinerea requires a sexual partner of the opposite type (heterothallism). This is explained by some major differences observed in the sequence and organization of genes involved in this process. In practice, these differences in reproduction have an important impact on epidemiology and the methods that may be developed to control these two fungi.
Analysis of the genomes provides valuable information about how S. sclerotiorum and B. cinerea evolved. They also lay the foundations for functional analyses that may explain the necrotrophic nature of the fungi and their distinctive reproductive characteristics, both of which contribute to their ability to infect plants. In the future, further study of the molecular mechanisms involved in the necrotrophic nature of the fungi should lead to the development of new, integrated methods for sustainable management of the diseases.
Centre INRA de Versailles-GrignonMuriel Viaud
Centre INRA de Versailles-GrignonJoëlle Amselem
Carolyn Anderson | alfa
Novel mechanisms of action discovered for the skin cancer medication Imiquimod
21.10.2016 | Technische Universität München
Second research flight into zero gravity
21.10.2016 | Universität Zürich
Researchers from the Institute for Quantum Computing (IQC) at the University of Waterloo led the development of a new extensible wiring technique capable of controlling superconducting quantum bits, representing a significant step towards to the realization of a scalable quantum computer.
"The quantum socket is a wiring method that uses three-dimensional wires based on spring-loaded pins to address individual qubits," said Jeremy Béjanin, a PhD...
In a paper in Scientific Reports, a research team at Worcester Polytechnic Institute describes a novel light-activated phenomenon that could become the basis for applications as diverse as microscopic robotic grippers and more efficient solar cells.
A research team at Worcester Polytechnic Institute (WPI) has developed a revolutionary, light-activated semiconductor nanocomposite material that can be used...
By forcefully embedding two silicon atoms in a diamond matrix, Sandia researchers have demonstrated for the first time on a single chip all the components needed to create a quantum bridge to link quantum computers together.
"People have already built small quantum computers," says Sandia researcher Ryan Camacho. "Maybe the first useful one won't be a single giant quantum computer...
COMPAMED has become the leading international marketplace for suppliers of medical manufacturing. The trade fair, which takes place every November and is co-located to MEDICA in Dusseldorf, has been steadily growing over the past years and shows that medical technology remains a rapidly growing market.
In 2016, the joint pavilion by the IVAM Microtechnology Network, the Product Market “High-tech for Medical Devices”, will be located in Hall 8a again and will...
'Ferroelectric' materials can switch between different states of electrical polarization in response to an external electric field. This flexibility means they show promise for many applications, for example in electronic devices and computer memory. Current ferroelectric materials are highly valued for their thermal and chemical stability and rapid electro-mechanical responses, but creating a material that is scalable down to the tiny sizes needed for technologies like silicon-based semiconductors (Si-based CMOS) has proven challenging.
Now, Hiroshi Funakubo and co-workers at the Tokyo Institute of Technology, in collaboration with researchers across Japan, have conducted experiments to...
14.10.2016 | Event News
14.10.2016 | Event News
12.10.2016 | Event News
21.10.2016 | Health and Medicine
21.10.2016 | Information Technology
21.10.2016 | Materials Sciences