Open AccessHomeostasis of cell wall integrity pathway phosphorylation is required for the growth and pathogenicity of Magnaporthe oryzae
Author(s) -
Cai Yongchao,
Liu Xinyu,
Shen Lingbo,
Wang Nian,
He Yangjie,
Zhang Haifeng,
Wang Ping,
Zhang Zhengguang
Publication year - 2022
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.13225
Subject(s) - biology , phosphorylation , microbiology and biotechnology , virulence , cell wall , magnaporthe , pathogenicity , phosphatase , botany , biochemistry , magnaporthe grisea , oryza sativa , gene
The cell wall provides a crucial barrier to stress imposed by the external environment. In the rice blast fungus Magnaporthe oryzae , this stress response is mediated by the cell wall integrity (CWI) pathway, consisting of a well‐characterized protein phosphorylation cascade. However, other regulators that maintain CWI phosphorylation homeostasis, such as protein phosphatases (PPases), remain unclear. Here, we identified two PPases, MoPtc1 and MoPtc2, that function as negative regulators of the CWI pathway. MoPtc1 and MoPtc2 interact with MoMkk1, one of the key components of the CWI pathway, and are crucial for the vegetative growth, conidial formation, and virulence of M. oryzae . We also demonstrate that both MoPtc1 and MoPtc2 dephosphorylate MoMkk1 in vivo and in vitro, and that CWI stress leads to enhanced interaction between MoPtc1 and MoMkk1. CWI stress abolishes the interaction between MoPtc2 and MoMkk1, providing a means of deactivation for CWI signalling. Our studies reveal that CWI signalling in M. oryzae is a highly coordinated regulatory mechanism vital for stress response and pathogenicity.