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A cell wall invertase modulates resistance to fusarium crown rot and sharp eyespot in common wheat

Journal of Integrative Plant Biology 2023年第7期65卷 1814-1825页

作者： Guoguo Lv Yixiao Zhang Lin Ma Xiangning Yan Mingjie Yuan Jianhui Chen Yongzhen Cheng Xi Yang Qi Qiao Leilei Zhang mohsin niaz Xiaonan Sun Qijun Zhang Shaobin Zhong Feng Chen National Key Laboratory of Wheat and Maize Crop Science/CIMMYT‐China Wheat and Maize Joint Research Center/Agronomy College Henan Agricultural UniversityZhengzhou 450000China Department of Plant Pathology North Dakota State UniversityFargoNorth DakotaUSA

Fusarium crown rot(FCR) and sharp eyespot(SE)are serious soil-borne diseases in wheat and its relatives that have been reported to cause wheat yield losses in many areas. In this study, the expression of a cell wall invertase gene, TaCWI-B1,was identified to be associated with FCR resistance through a combination of bulk segregant RNA sequencing and genome resequencing in a recombinant inbred line population. Two biparental populations were developed to further verify TaCWI-B1 association with FCR *** lines and ethyl methanesulfonate(EMS) mutants revealed TaCWI-B1 positively regulating FCR resistance. Determination of cell wall thickness and components showed that the TaCWI-B1-overexpression lines exhibited considerably increased thickness and pectin and cellulose contents. Furthermore, we found that TaCWI-B1 directly interacted with an alphagalactosidase(TaGAL). EMS mutants showed that TaGAL negatively modulated FCR resistance. The expression of TaGAL is negatively correlated with TaCWI-B1 levels, thus may reduce mannan degradation in the cell wall, consequently leading to thickening of the cell wall. Additionally, TaCWI-B1-overexpression lines and TaGAL mutants showed higher resistance to SE;however, TaCWI-B1 mutants were more susceptible to SE than *** study provides insights into a FCR and SE resistance gene to combat soil-borne diseases in common wheat.

关键词： cell wall thickness common wheat fusarium crown rot sharp eyespot TaCWI gene

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