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Transcriptome-based analysis of resistance mechanism to black point caused by Bipolaris sorokiniana in wheat
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Transcriptome-based analysis of resistance mechanism to black point caused by Bipolaris sorokiniana in wheat
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Journal Article
Transcriptome-based analysis of resistance mechanism to black point caused by Bipolaris sorokiniana in wheat
2021
Overview
Black point is a cereal disease caused by complex pathogens, of which the pathogenicity of
Bipolaris sorokiniana
is the most serious in wheat. Resistance to black point is quantitative in nature, and thus the mechanism is poorly understood. We conducted a comparative transcriptome analysis to identify differentially expressed genes (DEGs) in black point-slightly susceptible and -highly susceptible wheat lines at different timepoints following
B. sorokiniana
inoculation. DEGs associated with photosynthesis were upregulated in black point-slightly susceptible lines. The top Gene Ontology enrichment terms for biological processes were oxidation–reduction, response to cold, salt stress, oxidative stress, and cadmium ion; terms for cellular component genes were mainly involved in plasma membrane and cytoplasmic membrane-bounded vesicle, whereas those for molecular function were heme binding and peroxidase activity. Moreover, activities of antioxidant enzymes superoxide dismutase, catalase, and peroxidase were higher in slightly susceptible lines than those in highly susceptible lines (except peroxidase 12–24 days post-inoculation). Thus, resistance to
B. sorokiniana
-caused black point in wheat was mainly related to counteracting oxidative stress, although the specific metabolic pathways require further study. This study presents new insights for understanding resistance mechanisms of selected wheat lines to black point.
