Open AccessGhADF6 ‐mediated actin reorganization is associated with defence against Verticillium dahliae infection in cotton
Author(s) -
Sun Yongduo,
Zhong Mengmeng,
Li Yuanbao,
Zhang Ruihui,
Su Lei,
Xia Guixian,
Wang Haiyun
Publication year - 2021
Publication title -
molecular plant pathology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.945
H-Index - 103
eISSN - 1364-3703
pISSN - 1464-6722
DOI - 10.1111/mpp.13137
Subject(s) - verticillium dahliae , biology , microbiology and biotechnology , actin , pathogen , cytoskeleton , actin cytoskeleton , botany , cell , genetics
Several studies have revealed that actin depolymerizing factors (ADFs) participate in plant defence responses; however, the functional mechanisms appear intricate and need further exploration. In this study, we identified an ADF6 gene in upland cotton (designated as GhADF6 ) that is evidently involved in cotton's response to the fungal pathogen Verticillium dahliae . GhADF6 binds to actin filaments and possesses actin severing and depolymerizing activities in vitro and in vivo. When cotton root (the site of the fungus invasion) was inoculated with the pathogen, the expression of GhADF6 was markedly down‐regulated in the epidermal cells. By virus‐induced gene silencing analysis, the down‐regulation of GhADF6 expression rendered the cotton plants tolerant to V. dahliae infection. Accordingly, the abundance of actin filaments and bundles in the root cells was significantly higher than that in the control plant, which phenocopied that of the V. dahliae ‐challenged wild‐type cotton plant. Altogether, our results provide evidence that an increase in filament actin (F‐actin) abundance as well as dynamic actin remodelling are required for plant defence against the invading pathogen, which are likely to be fulfilled by the coordinated expressional regulation of the actin‐binding proteins, including ADF.