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

verfasst von

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.

Organisationseinheit(en)

Abteilung Phytomedizin

Externe Organisation(en)

International Rice Research Institute
Fachhochschule Erfurt (FHE)

Typ

Artikel

Journal

European Journal of Plant Pathology

Band

147

Seiten

115-127

Anzahl der Seiten

13

ISSN

0929-1873

Publikationsdatum

01.2017

Publikationsstatus

Veröffentlicht

Peer-reviewed

Ja

ASJC Scopus Sachgebiete

Agronomie und Nutzpflanzenwissenschaften, Pflanzenkunde, Gartenbau

Ziele für nachhaltige Entwicklung

SDG 13 – Klimaschutzmaßnahmen

Elektronische Version(en)

https://doi.org/10.1007/s10658-016-0985-8 (Zugang: Geschlossen)