Department of Botany and Plant Sciences, University of California, Riverside, CA 92521.
Plant Genetics, TUM School of Life Sciences, Technical University of Munich, Freising, 85354 Germany.
Proc Natl Acad Sci U S A. 2022 Mar 15;119(11):e2112820119. doi: 10.1073/pnas.2112820119. Epub 2022 Mar 7.
SignificanceKarrikins are chemicals in smoke that stimulate regrowth of many plants after fire. However, karrikin responses are not limited to species from fire-prone environments and can affect growth after germination. Putatively, this is because karrikins mimic an unknown signal in plants, KAI2 ligand (KL). Karrikins likely require modification in plants to become bioactive. We identify a gene, , that appears to negatively regulate biosynthesis of KL and metabolism of a specific karrikin. expression increases in response to karrikin or KL signaling, thus forming a negative feedback loop that limits further activation of the signaling pathway. This discovery will advance understanding of how karrikins are perceived and how smoke-activated germination evolved. It will also aid identification of the elusive KL.
枯酮是烟雾中的一种化学物质，能刺激许多植物在火灾后重新生长。然而，枯酮反应并不仅限于来自易发生火灾环境的物种，并且可以在发芽后影响生长。据称，这是因为枯酮模拟了植物中一种未知的信号，即 KAI2 配体（KL）。枯酮可能需要在植物中进行修饰才能具有生物活性。我们鉴定了一个基因 ，它似乎负调控 KL 的生物合成和特定枯酮的代谢。该基因的表达响应枯酮或 KL 信号而增加，从而形成一个负反馈环，限制信号通路的进一步激活。这一发现将有助于深入了解枯酮是如何被感知的，以及烟雾激活发芽是如何进化的。它还将有助于鉴定难以捉摸的 KL。
