The role of karrikin in regulating photo- and thermomorphogenesis

karrikin 在调节光和热形态发生中的作用

• 批准号: 409212330
• 负责人: Professor Dr. Thomas Schmülling, since 1/2021
• 金额: --
• 依托单位: Arbeitsgruppe Entwicklungsbiologie der Pflanze
• 依托单位国家: 德国
• 项目类别: Research Grants
• 财政年份: 2018
• 资助国家: 德国
• 起止时间: 2017-12-31 至 2021-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/409212330?language=en
• 关键词: role; karrikin; regulating; photo; thermomorphogenesis; role; karrikin; regulating; photo; thermomorphogenesis

Smoke derived karrikins have recently been shown to induce germination and inhibit hypocotyl elongation in Arabidopsis. Although relatively little is known about how karrikin regulates these responses at the molecular level, it is clear that the signalling pathway is closely connected to light signalling. Besides the fact that seedlings of the karrikin signalling mutants kai2 and smax1smxl2 show altered light responsiveness, also the central regulator of light signalling, HY5, is required for karrikin dependent inhibition of hypocotyl elongation. Also plant’s responses to an elevation in the ambient temperature (thermomorphogenesis) show a close connection to light signalling. Elevated temperatures result in an elongated hypocotyl, hyponastic leaf growth and petiole elongation, responses all ameliorated in the pif4 mutant that was first described for its role in the light signalling pathways. Furthermore, HY5 has also been shown to play important roles in thermomorphogenesis, antagonising the effects of PIF4. Here, we aim to delineate the connections between the newly described karrikin signalling network with light signalling pathways focusing on the role of Arabidopsis B-box proteins and HY5. Furthermore, we will explore how these interactions ultimately might regulate the plants responses to elevated temperatures.

最近已显示烟雾衍生的karrikins诱导拟南芥中的发芽和抑制下胚轴伸长。尽管对于Karrikin如何在分子水平调节这些响应的知识相对较少，但很明显，信号通路与光信号传导密切相关。除了以下事实：Karrikin信号传导突变体Kai2和Smax1smxl2的幼苗显示出改变的光反应性，也需要光信号传导的中心调节剂HY5，依赖于Karrikin依赖性抑制下胚层伸长。同样，植物对环境温度（热形成）中升高的反应也显示出与光信号传导的密切联系。温度升高会导致伸长的下胚轴，降低叶片生长和叶柄伸长，所有反应都在PIF4突变体中得到了改善，该反应首先被描述为其在光信号传导途径中的作用。此外，还显示HY5在热形态发生中起着重要作用，使PIF4的作用拮抗。在这里，我们的目标是描述新描述的Karrikin信号网络之间的连接，其光信号通路的重点是拟南芥B-box蛋白和HY5的作用。此外，我们将探讨这些相互作用最终如何调节植物对升高温度的反应。