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Open Access Green as soon as Postprint is submitted to ZB.
Barley shows reduced Fusarium head blight under drought and modular expression of differentially expressed genes under combined stress.
J. Exp. Bot. 74, 6820-6835 (2023)
Plants often face simultaneous abiotic and biotic stress conditions; however, physiological and transcriptional responses under such combined stress conditions are still not fully understood. Spring barley (Hordeum vulgare) is susceptible to Fusarium head blight (FHB), which is strongly affected by weather conditions. We therefore studied the potential influence of drought on FHB severity and plant responses in three varieties of different susceptibility. We found strongly reduced FHB severity in susceptible varieties under drought. The number of differentially expressed genes (DEGs) and strength of transcriptomic regulation reflected the concentrations of physiological stress markers such as abscisic acid or fungal DNA contents. Infection-related gene expression was associated with susceptibility rather than resistance. Weighted gene co-expression network analysis revealed 18 modules of co-expressed genes that reflected the pathogen- or drought-response in the three varieties. A generally infection-related module contained co-expressed genes for defence, programmed cell death, and mycotoxin detoxification, indicating that the diverse genotypes used a similar defence strategy towards FHB, albeit with different degrees of success. Further, DEGs showed co-expression in drought- or genotype-associated modules that correlated with measured phytohormones or the osmolyte proline. The combination of drought stress with infection led to the highest numbers of DEGs and resulted in a modular composition of the single-stress responses rather than a specific transcriptional output.
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Publication type
Article: Journal article
Document type
Scientific Article
Keywords
Hordeum Vulgare ; 3´-rna-seq ; Barley ; Fusarium Head Blight ; Drought Stress ; Transcriptome ; Weighted Gene Co-expression Network Analysis; Transcription Factor; Abiotic Stress; Pathogen Interaction; Water-deficit; Abscisic-acid; Jasmonic Acid; In-vitro; Wheat; Graminearum; Resistance
ISSN (print) / ISBN
0022-0957
e-ISSN
1460-2431
Journal
Journal of Experimental Botany
Quellenangaben
Volume: 74,
Issue: 21,
Pages: 6820-6835
Publisher
Oxford University Press
Publishing Place
Great Clarendon St, Oxford Ox2 6dp, England
Non-patent literature
Publications
Reviewing status
Peer reviewed
Grants
German Research Foundation
Bavarian State Ministry of the Environment and Consumer Protection
Bavarian State Ministry of the Environment and Consumer Protection