MPK3- and MPK6-mediated VLN3 phosphorylation regulates actin dynamics during stomatal immunity in Arabidopsis

Minxia Zou, Mengmeng Guo, Zhaoyang Zhou, Bingxiao Wang, Qing Pan, Jiajing Li, Jian-Min Zhou and Jiejie Li ()
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Minxia Zou: Beijing Normal University
Mengmeng Guo: Beijing Normal University
Zhaoyang Zhou: China Agricultural University
Bingxiao Wang: Beijing Normal University
Qing Pan: Beijing Normal University
Jiajing Li: Beijing Normal University
Jian-Min Zhou: State Key Laboratory of Plant Genomics, Institute of Genetics and Developmental Biology, Innovation Academy for Seed Design, Chinese Academy of Sciences
Jiejie Li: Beijing Normal University

Nature Communications, 2021, vol. 12, issue 1, 1-14

Abstract: Abstract Upon perception of pathogens, plants can rapidly close their stomata to restrict pathogen entry into internal tissue, leading to stomatal immunity as one aspect of innate immune responses. The actin cytoskeleton is required for plant defense against microbial invaders. However, the precise functions of host actin during plant immunity remain largely unknown. Here, we report that Arabidopsis villin3 (VLN3) is critical for plant resistance to bacteria by regulating stomatal immunity. Our in vitro and in vivo phosphorylation assays show that VLN3 is a physiological substrate of two pathogen-responsive mitogen-activated protein kinases, MPK3/6. Quantitative analyses of actin dynamics and genetic studies reveal that VLN3 phosphorylation by MPK3/6 modulates actin remodeling to activate stomatal defense in Arabidopsis.

Date: 2021
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DOI: 10.1038/s41467-021-26827-2

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