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

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.

最近已证明烟雾衍生的卡里金可以诱导拟南芥发芽并抑制下胚轴伸长。尽管人们对 karrikin 如何在分子水平上调节这些反应知之甚少，但很明显该信号通路与光信号传导密切相关。除了 karrikin 信号突变体 kai2 和 smax1smxl2 的幼苗表现出改变的光响应性之外，光信号传导的中央调节因子 HY5 也是 karrikin 依赖性抑制下胚轴伸长所必需的。植物对环境温度升高的反应（热形态发生）也显示出与光信号的密切联系。温度升高会导致下胚轴伸长、叶片生长迟缓和叶柄伸长，这些反应在 pif4 突变体中均得到改善，该突变体首次因其在光信号通路中的作用而被描述。此外，HY5 还被证明在热形态发生中发挥重要作用，拮抗 PIF4 的作用。在这里，我们的目标是描绘新描述的 karrikin 信号网络与光信号通路之间的联系，重点关注拟南芥 B-box 蛋白和 HY5 的作用。此外，我们将探索这些相互作用最终如何调节植物对高温的反应。