植物界の複雑な生化学コミュニケーション・ネットワークを解読する(Decoding the plant world’s complex biochemical communication networks)

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2024-03-21 パデュー大学

植物界の複雑な生化学コミュニケーション・ネットワークを解読する(Decoding the plant world’s complex biochemical communication networks)
A research team led by Purdue University scientists has documented new details about how petunias use volatile organic compounds to communicate. (Purdue Agricultural Communications photo/Tom Campbell)

研究チームが、花の細胞に詰まった無数のタンパク質や他の化合物の中で隠された、ペチュニアの複雑な分子言語を解読し始めた。植物は地に根を下ろしているため、昆虫や病原体などから逃げることができないが、彼らは揮発性有機化合物と呼ばれる香り物質を通じてお互いに警告を送ることができる。この研究で、ペチュニアの花が揮発性有機化合物を検出する過程の新しい詳細が明らかにされた。

<関連情報>

植物の揮発性コミュニケーションはKAI2を介したシグナル伝達経路に依存する Volatile communication in plants relies on a KAI2-mediated signaling pathway

SHANNON A. STIRLING , ANGELICA M. GUERCIO , RYAN M. PATRICK , XING-QI HUANG , […], AND NATALIA DUDAREVA
Science  Published:21 Mar 2024
DOI:https://doi.org/10.1126/science.adl4685

Editor’s summary

Plant responses to chemical signals carried through the air are critical for development, fitness, and adaptation. Stirling et al. identified a mechanism for the perception of the volatile compound (-)-germacrene D through a homolog of the Karrikin receptor KAI2 in petunia pistils. Genetic and biochemical experiments linked this perception with downstream signaling proteins and transcriptional targets. Perturbing the function of some of these components affected volatile-mediated communication and plant fitness. —Ankit Walia

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).

生物環境工学
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