研究人员表明，三个富含亮氨酸的重复受体激酶（LRR-RK）作为直接接受配体的植物肽（PSY）家族的受体，并介导两个相反途径之间的切换。与已知的LRR-RK不同的是，PSY受体（PSYR）在配体结合后激活信号传导，在配体耗尽后激活各种编码胁迫反应转录因子的基因表达。PSYR的缺失导致植物对生物和非生物胁迫的耐受性缺陷。这种依赖配体的激活系统有可能，使植物在配体产生障碍的代谢紊乱的受损部位附近组织中对胁迫反应进行调整。
据悉，决定是生长还是将能量转移到胁迫反应上，是植物在波动环境中生存的一个主要生理权衡。
附：英文原文
Title: Peptide ligand-mediated trade-off between plant growth and stress response
Author: Mari Ogawa-Ohnishi, Tomohide Yamashita, Mitsuru Kakita, Takuya Nakayama, Yuri Ohkubo, Yoko Hayashi, Yasuko Yamashita, Taizo Nomura, Saki Noda, Hidefumi Shinohara, Yoshikatsu Matsubayashi
Issue&Volume: 2022-10-14
Abstract: Deciding whether to grow or to divert energy to stress responses is a major physiological trade-off for plants surviving in fluctuating environments. We show that three leucine-rich repeat receptor kinases (LRR-RKs) act as direct ligand-perceiving receptors for PLANT PEPTIDE CONTAINING SULFATED TYROSINE (PSY)-family peptides and mediate switching between two opposing pathways. By contrast to known LRR-RKs, which activate signaling upon ligand binding, PSY receptors (PSYRs) activate the expression of various genes encoding stress response transcription factors upon depletion of the ligands. Loss of PSYRs results in defects in plant tolerance to both biotic and abiotic stresses. This ligand-deprivation–dependent activation system potentially enables plants to exert tuned regulation of stress responses in the tissues proximal to metabolically dysfunctional damaged sites where ligand production is impaired.
DOI: abq5735
Source: https://www.science.org/doi/10.1126/science.abq5735