Journal
PHYTOPATHOLOGY RESEARCH
Volume 5, Issue 1, Pages -Publisher
SPRINGERNATURE
DOI: 10.1186/s42483-023-00182-0
Keywords
Sclerotinia sclerotiorum; Chitin; LysM-RLK; G-type lectin RLK; Pattern-triggered immunity
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In this study, a G-type lectin RLK named NbERK1 was found to enhance plant resistance to the fungal pathogen Sclerotinia sclerotiorum through regulating chitin signaling. The LysM-RLK NbCERK1/NbLYK4 was also shown to positively mediate plant resistance to S. sclerotiorum. These findings highlight the importance of NbERK1 in chitin perception and signaling for plant resistance to fungal pathogens.
Fungal pathogens are among the main destructive microorganisms for crops and ecosystems worldwide, causing substantial agricultural and economic losses. Plant cell surface-localized lysin motif (LysM)-containing receptor-like kinases (RLKs) or receptor-like proteins (RLPs) enhance plant resistance to fungal pathogens via sensing chitin, which is a conserved component of the fungal cell wall. Other types of RLKs also regulate chitin signaling via distinct mechanisms in plants. In this study, we identified a G-type lectin RLK, NbERK1, which positively regulated chitin signaling and resistance to the fungal pathogen Sclerotinia sclerotiorum in the model plant Nicotiana benthamiana. In addition, the LysM-RLK NbCERK1/NbLYK4 was shown to mediate plant resistance to S. sclerotiorum positively. Further, the association of chitin-induced NbCERK1-NbLYK4 was found to be essential for chitin perception and signaling. Importantly, NbERK1 was associated with NbCERK1/NbLYK4 and positively regulated chitin-induced NbCERK1-NbLYK4 association. Moreover, chitin could induce the dissociation of NbERK1 from the NbCERK1-NbLYK4 complex. Also, the kinase activity of NbERK1 was likely essential for this dissociation and plant resistance-enhancing activity of NbERK1. Together, these results suggest that NbERK1 is a novel component of the chitin receptor complex and enhances plant resistance to fungal pathogens via regulating chitin signaling.
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