Functional analysis of PAMP-responsive phosphoprotein MARK2
H. MATSUI (1), I. Yotsui (2), K. Maeda (3), G. Hyon (2), Y. Nomura (2), Y. Ichinose (4), H. Nakagami (5) (1) RIKEN CSRS / Okayama University, Japan; (2) RIKEN CSRS, Japan; (3) Faculty of Agriculture, Okayama University, Japan; (4) Graduate school of Environmental and Life Science, Okayama University, Japan; (5) RIKEN CSRS / MPIPZ, Japan

Protein phosphorylation plays important roles in plant immune signaling. To fully understand plant immunity, we have been identifying phospho-regulated proteins during pathogen-associated molecular pattern (PAMP)-triggered immunity (PTI) by a phosphoproteome analysis. MARK2 is a well-conserved land plant specific protein with unknown function, and is rapidly phosphorylated upon PAMP stimulation in Arabidopsis. T-DNA insertion alleles for MARK2 display reduced or enhanced reactive oxygen species (ROS) production upon flg22 treatment. Moreover, we found that the mark2 mutant displays enhanced resistance against the necrotrophic fungal pathogen Alternaria brassicicola O-264 isolate. These data suggest that MARK2 is a novel regulator of plant immunity.

Abstract Number: P18-686
Session Type: Poster