Forum for Science, Industry and Business

Sponsored by:     3M 
Search our Site:

 

With a little help from my fungus: fungus increases resistance of tomato plants against worms

22.11.2016

Plants are constantly challenged by hungry animals and infectious microbes. Tomato plants, for example, are often infested with little worms that feed on their roots. A fungus can help them to better defend themselves against these attacks, scientists report in the journal New Phytologist. In the future, farmers and gardeners might benefit from the new findings, as they may be able to use a kind of 'fungus-vaccination' to prepare their tomato plants for impeding an infestation with worms.

For tomato plants, major enemies are nematodes of the species Meloidogyne incognita. These are little worms that first induce the roots to form galls, which they then inhabit, feeding on the plant tissue. The plants' problem is: they cannot run away from their attackers. However, they have other means of defending themselves, namely chemical substances that are toxic or deterrent to the parasitic nematodes. The production of these compounds in the plant is tidily regulated by small hormones, like salicylic and jasmonic acid.


Tomatoes are tasty common crops in human agriculture

pixabay


When tomato plants are infested with nematodes, the roots form galls that are then inhabited by the little worms

Ainhoa Martínez-Medina

Not all interactions with other organisms are detrimental for plants, however – some can be beneficial. For example, associations between specific microbes and plant roots. Similar to microbial communities in the human gut, microbial communities associated with roots can provide their hosts with essential functions related to nutrient acquisition and protection against infections.

One example for such an association has now been reported by an international team of researchers in the journal New Phytologist: a fungus of the genus Trichoderma lives inside the tissue of tomato plants (endophytically) and helps its host to defend itself against infestations by parasitic nematodes.

“The fungus boosts plant immunity by enhancing the production of toxic chemical compounds upon nematode attack. This limits the invasion of the roots by nematodes, reduces the nematodes’ fecundity and compromises the formation of root galls”, explains Dr. Ainhoa Martinez-Medina, first author of the study and a scientist at the German Centre for Integrative Biodiversity Research (iDiv) and the Friedrich-Schiller-University Jena (FSU). Martinez-Medina has conducted the experiments at Utrecht University (Netherlands), with which she had been affiliated before moving to Leipzig.

To investigate the complex interactions between the tomato plants, the fungus, and the nematodes, the researchers have used a sophisticated study design in the laboratory. Half of the roots of their test plants were grown in one pot, and the other half in another pot. This allowed the scientists to test different combinations of their experimental treatments, namely infestation with nematodes versus no infestation, and association with fungus versus no association. Subsequently, marker genes involved in pathways modulated by salicylic and jasmonic acid were investigated.

The results show that the Trichoderma fungus “primes” the plant, which can then defend itself faster against nematodes. “Such a ‘priming’ is comparable to a vaccination for us humans, through which our immune system learns and subsequently can react more effectively to an infection”, explains Martínez-Medina. In the future, the knowledge about beneficial fungi could also help to develop sustainable solutions for agriculture, the scientist says: “Inoculants based on these beneficial microbes could help to ‘immunize’ the plants against pathogens and pests, thereby reducing yield losses due to infections in a sustainable way.”

Interestingly, the fungus-induced resistance is a plastic phenomenon. This means that it adapts according to the stage of the nematode infection: in the beginning, the fungus boosts salicylic-dependent defences in the roots, leading to higher resistance against the nematode invasion. Subsequently, during the nematode feeding stage, the fungus increases plant defences regulated by jasmonic acid, leading to reduced nematode development and reproduction.

Publication:
Martínez-Medina, A., Fernandez, I., Lok, G. B., Pozo, M. J., Pieterse, C. M. J. and Van Wees, S. C. M. (2016), Shifting from priming of salicylic acid- to jasmonic acid-regulated defences by Trichoderma protects tomato against the root knot nematode Meloidogyne incognita. New Phytol. doi:10.1111/nph.14251
http://dx.doi.org/10.1111/nph.14251

Funding:
This research was supported by Marie Curie Fellowship 301662 (to A.M-M.), VIDI grant 11281 from the Netherlands Organization of Scientific Research (to S.C.M.V.W.), and ERC Advanced Grant 269072 (to C.M.J.P.).

Further information:
Dr. Ainhoa Martínez-Medina (only English and Spanish)
Postdoctoral researcher at the Department Molecular Interaction Ecology at the German Centre for Integrative Biodiversity Research (iDiv) and the Friedrich-Schiller-University Jena (FSU).
Tel: +49 341 9733163
Mobile number on request, please contact iDiv media relations.
Web: https://www.idiv.de/the-centre/employees/details/eshow/martinez-medina-ainhoa.ht...

and
Dr. Tabea Turrini (English and German)
Media Relations iDiv
Tel.: +49 341 9733 106
Web: http://www.idiv.de/de/presse/mitarbeiterinnen.html

iDiv is a central facility of the University of Leipzig within the meaning of Section 92 (1) of the Act on Academic Freedom in Higher Education in Saxony (Sächsisches Hoch-schulfreiheitsgesetz, SächsHSFG). It is run together with the Martin Luther University Halle-Wittenberg and the Friedrich Schiller University Jena, as well as in cooperation with the Helmholtz Centre for Environmental Research – UFZ. The following non-university research institutions are involved as cooperation partners: the Helmholtz Centre for Environmental Research – UFZ, the Max Planck Institute for Biogeochemistry (MPI BGC), the Max Planck Institute for Chemical Ecology (MPI CE), the Max Planck Institute for Evolutionary Anthropology (MPI EVA), the Leibniz Institute DSMZ–German Collection of Micro¬organisms and Cell Cultures, the Leibniz Institute of Plant Biochemistry (IPB), the Leibniz Institute of Plant Genetics and Crop Plant Research (IPK) and the Leibniz Institute Senckenberg Museum of Natural History Görlitz (SMNG).

Weitere Informationen:

https://www.idiv.de/en/news/news_single_view/news_article/with-a-littl.html

Tabea Turrini | idw - Informationsdienst Wissenschaft

Further reports about: MPI Max Planck Institute Trichoderma acid fungus jasmonic jasmonic acid nematode salicylic tomato tomato plants

More articles from Life Sciences:

nachricht A new molecular player involved in T cell activation
07.12.2018 | Tokyo Institute of Technology

nachricht News About a Plant Hormone
07.12.2018 | Julius-Maximilians-Universität Würzburg

All articles from Life Sciences >>>

The most recent press releases about innovation >>>

Die letzten 5 Focus-News des innovations-reports im Überblick:

Im Focus: Researchers develop method to transfer entire 2D circuits to any smooth surface

What if a sensor sensing a thing could be part of the thing itself? Rice University engineers believe they have a two-dimensional solution to do just that.

Rice engineers led by materials scientists Pulickel Ajayan and Jun Lou have developed a method to make atom-flat sensors that seamlessly integrate with devices...

Im Focus: Three components on one chip

Scientists at the University of Stuttgart and the Karlsruhe Institute of Technology (KIT) succeed in important further development on the way to quantum Computers.

Quantum computers one day should be able to solve certain computing problems much faster than a classical computer. One of the most promising approaches is...

Im Focus: Substitute for rare earth metal oxides

New Project SNAPSTER: Novel luminescent materials by encapsulating phosphorescent metal clusters with organic liquid crystals

Nowadays energy conversion in lighting and optoelectronic devices requires the use of rare earth oxides.

Im Focus: A bit of a stretch... material that thickens as it's pulled

Scientists have discovered the first synthetic material that becomes thicker - at the molecular level - as it is stretched.

Researchers led by Dr Devesh Mistry from the University of Leeds discovered a new non-porous material that has unique and inherent "auxetic" stretching...

Im Focus: The force of the vacuum

Scientists from the Theory Department of the Max Planck Institute for the Structure and Dynamics of Matter (MPSD) at the Center for Free-Electron Laser Science (CFEL) in Hamburg have shown through theoretical calculations and computer simulations that the force between electrons and lattice distortions in an atomically thin two-dimensional superconductor can be controlled with virtual photons. This could aid the development of new superconductors for energy-saving devices and many other technical applications.

The vacuum is not empty. It may sound like magic to laypeople but it has occupied physicists since the birth of quantum mechanics.

All Focus news of the innovation-report >>>

Anzeige

Anzeige

VideoLinks
Industry & Economy
Event News

EGU 2019 meeting: Media registration now open

06.12.2018 | Event News

Expert Panel on the Future of HPC in Engineering

03.12.2018 | Event News

Inaugural "Virtual World Tour" scheduled for december

28.11.2018 | Event News

 
Latest News

A new molecular player involved in T cell activation

07.12.2018 | Life Sciences

High-temperature electronics? That's hot

07.12.2018 | Materials Sciences

Supercomputers without waste heat

07.12.2018 | Physics and Astronomy

VideoLinks
Science & Research
Overview of more VideoLinks >>>