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Type one protein phosphatases (TOPPs) contribute to the plant defense response in Arabidopsis
Author(s) -
Liu Yaqiong,
Yan Jia,
Qin Qianqian,
Zhang Jing,
Chen Yan,
Zhao Lulu,
He Kai,
Hou Suiwen
Publication year - 2020
Publication title -
journal of integrative plant biology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.734
H-Index - 83
eISSN - 1744-7909
pISSN - 1672-9072
DOI - 10.1111/jipb.12845
Subject(s) - arabidopsis , plant defense against herbivory , phosphatase , biology , microbiology and biotechnology , genetics , gene , phosphorylation , mutant
Plant immunity must be tightly controlled to avoid activation of defense mechanisms in the absence of pathogen attack. Protein phosphorylation is a common mechanism regulating immune signaling. In Arabidopsis thaliana , nine members of the type one protein phosphatase (TOPP) family (also known as protein phosphatase 1, PP1) have been identified. Here, we characterized the autoimmune phenotype of topp4‐1 , a previously identified dominant‐negative mutant of TOPP4. Epistasis analysis showed that defense activation in topp4‐1 depended on NON‐RACE‐SPECIFIC DISEASE RESISTANCE1, PHYTOALEXIN DEFICIENT4, and the salicylic acid pathway. We generated topp1/4/5/6/7/8/9 septuple mutants to investigate the function of TOPPs in plant immunity. Elevated defense gene expression and enhanced resistance to Pseudomonas syringae pv. tomato ( Pst ) DC3000 in the septuple mutant indicate that TOPPs function in plant defense responses. Furthermore, TOPPs physically interacted with mitogen‐activated protein kinases (MAPKs) and affected the MAPK‐mediated downstream defense pathway. Thus, our study reveals that TOPPs are important regulators of plant immunity.