Magnaporthe oryzae Auxiliary Activity Protein MoAa91 Functions as Chitin-Binding Protein To Induce Appressorium Formation on Artificial Inductive Surfaces and Suppress Plant Immunity

• DOI: 10.1128/mbio.03304-19
• Publication Date: 2020-03-24T12:54:46Z
• Authors: Ying Li; Xinyu Liu; Muxing Liu; Yang Wang; Yibin Zou; Yimei You; Lina Yang; Jiexiong Hu; Haifeng Zhang; Xiaobo Zheng; Ping Wang; Zhengguang Zhang
• Keywords: Appressorium; Magnaporthe

The rice blast fungus Magnaporthe oryzae generates infection structure appressoria in response to surface cues largely due functions of signaling molecules, including G-proteins, regulators G-protein (RGS), mitogen-activated protein (MAP) kinase pathways, cAMP signaling, and TOR pathways. M. encodes eight RGS RGS-like proteins (MoRgs1 MoRgs8), MoRgs1, MoRgs3, MoRgs4, MoRgs7 were found be particularly important appressorium development. To explore the mechanisms by which these regulate development, we have performed a comparative planta transcriptomic study identified an uxiliary ctivity family 9 (Aa9) homolog that named MoAa91. We showed MoAa91 was secreted from recombinant could compete with chitin elicitor-binding precursor (CEBiP) for binding, thereby suppressing chitin-induced plant immunity. By identifying as novel molecule functioning development effector host immunity, our studies revealed mechanism pathogen-host interactions.