Izumi Yotsui, Hidenori Matsui, Shingo Miyauchi, Hidekazu Iwakawa, Katharina Melkonian, Titus Schlüter, Santiago Michavila, Takehiko Kanazawa, Yuko Nomura, Sara Christina Stolze, Hyung-Woo Jeon, Yijia Yan, Anne Harzen, Shigeo S Sugano, Makoto Shirakawa, Ryuichi Nishihama, Yasunori Ichihashi, Selena Gimenez Ibanez, Ken Shirasu, Takashi Ueda, Takayuki Kohchi, Hirofumi Nakagami
Pattern-recognition receptor (PRR)-triggered immunity (PTI) wards off a wide range of pathogenic microbes, playing a pivotal role in angiosperms. The model liverwort Marchantia polymorpha triggers defense-related gene expression upon sensing components of bacterial and fungal extracts, suggesting the existence of PTI in this plant model. However, the molecular components of the putative PTI in M. polymorpha and the significance of PTI in bryophytes have not yet been described. We here show that M. polymorpha has four lysin motif (LysM)-domain-containing receptor homologs, two of which, LysM-receptor-like kinase (LYK) MpLYK1 and LYK-related (LYR) MpLYR, are responsible for sensing chitin and peptidoglycan fragments, triggering a series of characteristic immune responses...
August 16, 2023: Current Biology: CB