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Transcriptional Basis of Drought-Induced Susceptibility to the Rice Blast Fungus . | LitMetric

Transcriptional Basis of Drought-Induced Susceptibility to the Rice Blast Fungus .

Front Plant Sci

INRA, UMR BGPI INRA/CIRAD/SupAgro, Campus International de Baillarguet Montpellier, France.

Published: October 2016

AI Article Synopsis

Article Abstract

Plants are often facing several stresses simultaneously. Understanding how they react and the way pathogens adapt to such combinational stresses is poorly documented. Here, we developed an experimental system mimicking field intermittent drought on rice followed by inoculation by the pathogenic fungus . This experimental system triggers an enhancement of susceptibility that could be correlated with the dampening of several aspects of plant immunity, namely the oxidative burst and the transcription of several pathogenesis-related genes. Quite strikingly, the analysis of fungal transcription by RNASeq analysis under drought reveals that the fungus is greatly modifying its virulence program: genes coding for small secreted proteins were massively repressed in droughted plants compared to unstressed ones whereas genes coding for enzymes involved in degradation of cell-wall were induced. We also show that drought can lead to the partial breakdown of several major resistance genes by affecting plant gene and/or pathogen effector expression. We propose a model where a yet unknown plant signal can trigger a change in the virulence program of the pathogen to adapt to a plant host that was affected by drought prior to infection.

Download full-text PDF

Source
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC5081564PMC
http://dx.doi.org/10.3389/fpls.2016.01558DOI Listing

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