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Home NEWS Science News Biology

Disease-resistant rice and wheat plants may modulate disease susceptibility in their neighbors

Bioengineer by Bioengineer
September 12, 2023
in Biology
Reading Time: 3 mins read
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Disease-resistant rice and wheat plants may modulate disease susceptibility in their neighbors
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Growing several plant varieties in the same field for disease resistance is a longstanding agricultural practice, but can have unpredictable results. A study publishing September 12th in the open access journal PLOS Biology by Jean-Benoit Morel at Institut National de Recherche pour l’Agriculture l’Alimentation et l’Environnement, Montpellier, France, and colleagues suggests that plant-to-plant interactions may confer disease immunity in both wheat and rice.

Disease-resistant rice and wheat plants may modulate disease susceptibility in their neighbors

Credit: Jean-Benoit Morel (CC-BY 4.0, https://creativecommons.org/licenses/by/4.0/)

Growing several plant varieties in the same field for disease resistance is a longstanding agricultural practice, but can have unpredictable results. A study publishing September 12th in the open access journal PLOS Biology by Jean-Benoit Morel at Institut National de Recherche pour l’Agriculture l’Alimentation et l’Environnement, Montpellier, France, and colleagues suggests that plant-to-plant interactions may confer disease immunity in both wheat and rice.

Neighbor-Modulated Susceptibility (NMS) occurs when healthy, same-species neighbor plants modulate basal immunity and susceptibility to pathogens. However, NMS is not well understood. In order to evaluate NMS’ potential to reduce the spread of plant pathogens, researchers measured disease susceptibility in 200 pairs of rice and durum wheat varieties. They selected one set of genotypes composed of selectively bred varieties and one from populations that had not undergone modern selection. The pairs of same-species variety mixtures grown in pots under controlled greenhouse conditions were inoculated with fungal foliar pathogens, and disease susceptibility was monitored before any possible pathogen dispersal. Using a statistical model, the authors were able to quantify the relevance of NMS and the relative contribution of neighbor effect on pathogen susceptibility in varietal mixtures.

The researchers identified 23 same-species mixtures (~11%) where plant-to-plant interactions modulated disease susceptibility, suggesting that Neighbor-Modulated Susceptibility is a relatively frequent phenomenon. They observed both positive and negative effects of the neighbors, indicating that the consequences of plant-to-plant interactions can be variable. The study had several limitations, for example, only two crops, rice and wheat, were tested. Additional future studies may include field trials, where plants are subjected to a range of outdoor conditions, rather than grown in a greenhouse.

According to the authors, “These findings open new avenues to develop more sustainable agricultural practices by engineering less susceptible crop mixtures thanks to emergent, but now predictable properties of mixtures. Our study suggests that the indirect effects of plant-plant interactions on pathogen susceptibility could be used to design varietal mixtures with embedded crop protection.”

Morel adds, “In animals and in particular herds, it is commonly observed that individuals adjust their functioning according to their neighbors, in a way that benefits the group but not necessarily to each individual. This work shows that such a phenomenon exists in plants, suggesting in that case that plants regulate their immunity at the population level, opening new perspectives for crop and ecology research.”

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In your coverage, please use this URL to provide access to the freely available paper in PLOS Biology: http://journals.plos.org/plosbiology/article?id=10.1371/journal.pbio.3002287

Citation: Pélissier R, Ballini E, Temple C, Ducasse A, Colombo M, Frouin J, et al. (2023) The genetic identity of neighboring plants in intraspecific mixtures modulates disease susceptibility of both wheat and rice. PLoS Biol 21(9): e3002287. https://doi.org/10.1371/journal.pbio.3002287

 

Author Countries: France, China

 

Funding: see manuscript



Journal

PLoS Biology

DOI

10.1371/journal.pbio.3002287

Method of Research

Experimental study

Subject of Research

Not applicable

COI Statement

Competing interests: The authors have declared that no competing interests exist.

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