近日，美国普渡大学Natalia Dudareva及其团队发现，植物的挥发性通讯依赖于KAI2介导的信号通路。相关论文于2024年3月22日发表于国际学术期刊《科学》。

研究人员利用挥发性萜类化合物在生殖器官发育中类似激素的功能，作为一个具有视觉标记的交流系统，证明矮牵牛karrikin不敏感受体PhKAI2ia能立体特异性地感知(-)-吉玛烯D信号，触发KAI2介导的信号级联并影响植物的适应性。这项研究揭示了KAI2受体中间支系的作用，阐明了依赖KAI2ia的信号通路在挥发性通讯中的参与，并为植物嗅觉和长期存在的潜在内源KAI2配体的性质问题提供了新的见解。

研究人员表示，植物不断接触挥发性有机化合物（VOC），这些化合物在植物与植物之间的交流、植物内部的自我信号传递，以及植物与微生物之间的相互作用过程中被释放出来。因此，了解VOC的感知和下游信号传导对于揭示植物信息交流背后的机制至关重要，而这些机制在很大程度上仍未得到探索。

附：英文原文

Title: Volatile communication in plants relies on a KAI2-mediated signaling pathway

Author: Shannon A. Stirling, Angelica M. Guercio, Ryan M. Patrick, Xing-Qi Huang, Matthew E. Bergman, Varun Dwivedi, Ruy W. J. Kortbeek, Yi-Kai Liu, Fuai Sun, W. Andy Tao, Ying Li, Benot Boachon, Nitzan Shabek, Natalia Dudareva

Issue&Volume: 2024-03-22

Abstract: Plants are constantly exposed to volatile organic compounds (VOCs) that are released during plant-plant communication, within-plant self-signaling, and plant-microbe interactions. Therefore, understanding VOC perception and downstream signaling is vital for unraveling the mechanisms behind information exchange in plants, which remain largely unexplored. Using the hormone-like function of volatile terpenoids in reproductive organ development as a system with a visual marker for communication, we demonstrate that a petunia karrikin-insensitive receptor, PhKAI2ia, stereospecifically perceives the ()-germacrene D signal, triggering a KAI2-mediated signaling cascade and affecting plant fitness. This study uncovers the role(s) of the intermediate clade of KAI2 receptors, illuminates the involvement of a KAI2ia-dependent signaling pathway in volatile communication, and provides new insights into plant olfaction and the long-standing question about the nature of potential endogenous KAI2 ligand(s).

DOI: adl4685

Source: https://www.science.org/doi/10.1126/science.adl4685