GhCYP710A1 Participates in Cotton Resistance to Verticillium Wilt by Regulating Stigmasterol Synthesis and Plasma Membrane Stability

Cotton is an important economic crop. Cotton Verticillium wilt caused by Verticillium dahliae seriously damages production. Phytosterols play roles in plant-pathogen interaction. To explore the function and related mechanism of phytosterols in the interaction between Verticillium dahliae and cotton plants, and the resistance to Verticillium wilt, in this study, we analyzed the changes of sterol composition and content in cotton roots infected by Verticillium dahliae, and identified the sterol C22-desaturase gene GhCYP710A1 from upland cotton. Through overexpressing and silencing the gene in cotton plant, and ectopically expressing the gene in Arabidopsis, we characterized the changes of sterol composition and the resistance to Verticillium wilt in transgenic plants. The infection of Verticillium dahliae resulted in the content of total sterol and each sterol category decreasing in cotton root. The ratio of stigmasterol to sitosterol (St/Si) increased, indicating that the conversion of sitosterol to stigmasterol was activated. Consistently, the expression level of GhCYP710A1 was upregulated after infection. The GhCYP710A1 has the conservative domain that is essential for sterol C22-desaturase in plant and is highly expressed in root and stem, and its subcellular location is in the endoplasmic reticulum. The ectopic expression of GhCYP710A1 gene promoted the synthesis of stigmasterol in Arabidopsis. The St/Si value is dose-dependent with the expression level of GhCYP710A1 gene. Meanwhile, the resistance to Verticillium wilt of transgenic Arabidopsis increased and the permeability of cell membrane decreased, and the content of ROS decreased after V991 (a strain of Verticillium dahliae) infection. Consistently, the resistance to Verticillium wilt significantly increased in the transgenic cotton plants overexpressing GhCYP710A1. The membrane permeability and the colonization of V991 strain in transgenic roots were decreased. On the contrary, silencing GhCYP710A1 resulted in the resistance to Verticillium wilt being decreased. The membrane permeability and the colonization of V991 were increased in cotton roots. The expression change of GhCYP710A1 and the content alteration of stigmasterol lead to changes in JA signal transduction, hypersensitivity and ROS metabolism in cotton, which might be a cause for regulating the Verticillium wilt resistance of cotton plant. These results indicated that GhCYP710A1 might be a target gene in cotton resistance breeding.

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