Journal
NATURE COMMUNICATIONS
Volume 14, Issue 1, Pages -Publisher
NATURE PORTFOLIO
DOI: 10.1038/s41467-023-40171-7
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The study finds that an LRR-RLK from Phytophthora sojae can activate pattern-triggered immunity in host soybean and nonhost tomato and Nicotiana benthamiana plants. This provides a novel microbe-associated molecular pattern for oomycete sexual reproduction and demonstrates a scenario where a pathogen LRR-RLK is sensed by a plant LRR-RLP to initiate plant immunity.
LRR-RLKs are also widespread in plants and oomycete pathogens. Here, the authors report that an LRR-RLK from Phytophthora sojae can activate pattern-triggered immunity in host soybean and nonhost tomato and Nicotiana benthamiana plants. 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.
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