Rice response to simultaneous bacterial blight and drought stress during compatible and incompatible interactions

authored by: Gerbert Sylvestre Dossa, Rolando Torres, Amelia Henry, Ricardo Oliva, Edgar Maiss, Casiana Vera Cruz, Kerstin Wydra
Abstract: Plant response to one type of stress can be affected by simultaneous exposure to a second stress, for example when abiotic and biotic stresses occur together. Ten rice genotypes comprising those with bacterial blight (BB) resistance (R) genes, drought quantitative trait loci (QTLs) plus a BB R gene, and BB susceptible genotypes, were subjected to mild and moderate drought stress and plants were inoculated with two Xoo strains (PXO99 and PXO145) to simulate the challenges rice crops face under simultaneous stress of drought and BB. Plant height and dry shoot biomass were significantly reduced by drought stress treatments. The BB disease lesion lengths varied according to rice genotypes and PXO99 Xoo multiplication and spread in planta was higher compared to that of PXO145, which generally decreased under mild drought stress. Rice genotype IRBB7 (Xa7) showed less Xoo spread and a reduced Xoo multiplication under drought stress compared to the well-watered control with PXO145. In contrast, in genotypes with a different BB R gene and/or drought QTLs [IRBB4 (Xa4), IR87705–6-9-B (Xa4 + qDYT_2.2), IR87707–445-B-B-B (Xa4 + qDYT_2.2 + qDYT_4.1) and IR87707–446-B-B-B (Xa4 + qDYT_2.2 + qDYT_4.1)], Xoo multiplication and spread in planta was higher with drought stress. This study has shown that drought stress affected rice response to the BB pathogen and the response varied according to the rice genotype. It is concluded that evaluating rice varieties under combined abiotic and biotic stresses will be the best strategy to determine biotic stress resistance durability under climate change.
Organisation(s): Phytomedicine Section
External Organisation(s): International Rice Research Institute
Erfurt University of Applied Sciences
Type: Article
Journal: European Journal of Plant Pathology
Volume: 147
Pages: 115-127
No. of pages: 13
ISSN: 0929-1873
Publication date: 01.2017
Publication status: Published
Peer reviewed: Yes
ASJC Scopus subject areas: Agronomy and Crop Science, Plant Science, Horticulture
Sustainable Development Goals: SDG 13 - Climate Action
Electronic version(s): https://doi.org/10.1007/s10658-016-0985-8 (Access: Closed)