A Phytophthora receptor-like kinase regulates oospore development and can activate pattern-triggered plant immunity

Yong Pei, Peiyun Ji, Jierui Si, Hanqing Zhao, Sicong Zhang, Ruofei Xu, Huijun Qiao, Weiwei Duan, Danyu Shen, Zhiyuan Yin () and Daolong Dou ()
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Yong Pei: Nanjing Agricultural University
Peiyun Ji: Nanjing Agricultural University
Jierui Si: Nanjing Agricultural University
Hanqing Zhao: Nanjing Agricultural University
Sicong Zhang: Nanjing Agricultural University
Ruofei Xu: Nanjing Agricultural University
Huijun Qiao: Nanjing Agricultural University
Weiwei Duan: Nanjing Agricultural University
Danyu Shen: Nanjing Agricultural University
Zhiyuan Yin: Nanjing Agricultural University
Daolong Dou: Nanjing Agricultural University

Nature Communications, 2023, vol. 14, issue 1, 1-15

Abstract: Abstract Plant cell-surface leucine-rich repeat receptor-like kinases (LRR-RLKs) and receptor-like proteins (LRR-RLPs) form dynamic complexes to receive a variety of extracellular signals. LRR-RLKs are also widespread in oomycete pathogens, whereas it remains enigmatic whether plant and oomycete LRR-RLKs could mediate cell-to-cell communications between pathogen and host. Here, we report that an LRR-RLK from the soybean root and stem rot pathogen Phytophthora sojae, PsRLK6, can activate typical pattern-triggered immunity in host soybean and nonhost tomato and Nicotiana benthamiana plants. PsRLK6 homologs are conserved in oomycetes and also exhibit immunity-inducing activity. A small region (LRR5-6) in the extracellular domain of PsRLK6 is sufficient to activate BAK1- and SOBIR1-dependent immune responses, suggesting that PsRLK6 is likely recognized by a plant LRR-RLP. Moreover, PsRLK6 is shown to be up-regulated during oospore maturation and essential for the oospore development of P. sojae. Our data provide a novel type of microbe-associated molecular pattern that functions in the sexual reproduction of oomycete, and a scenario in which a pathogen LRR-RLK could be sensed by a plant LRR-RLP to mount plant immunity.

Date: 2023
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DOI: 10.1038/s41467-023-40171-7

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