A Mobile Auxin Signal Connects Temperature Sensing in Cotyledons with Growth Responses in Hypocotyls
A Mobile Auxin Signal Connects Temperature Sensing in Cotyledons with Growth Responses in Hypocotyls
复制标题
DOI：
10.1104/pp.18.01377
复制
发表时间：
2019-06-01
期刊：
影响因子：
7.4
通讯作者：
Delker, Carolin
中科院分区：
文献类型：
--
作者：
Bellstaedt, Julia;Trenner, Jana;Delker, Carolin
植物具有非凡的能力来调整它们的生长和发育以适应环境温度的升高。根、下胚轴和叶柄在温暖的温度下伸长生长增加是幼苗热形态发生的标志。在过去的十年里，在识别调控这些生长反应的分子信号成分方面取得了重大进展。环境温度的升高利用光感应和信号转导网络的不同组件来触发生长调整。然而，温度感知和反应是否是在所有植物器官中均匀发生的普遍过程尚不清楚。或者，温度感应可能局限于特定的组织或器官，这将需要一个系统信号来调节植物远端部分的反应。在这里，我们展示了拟南芥(Arabiopsis Thaliana)幼苗对高温的器官特异性转录组反应，并且热形态发生涉及自主的和器官相互依赖的温度感知和信号传递。苗木根系能够以不依赖于地上部的方式感知和响应温度，而地上部的温度响应需要局部和系统的过程。下胚轴细胞伸长的诱导需要子叶的温度感应，随后产生可移动的生长素信号。随后，生长素运输到下胚轴，在那里它触发油菜素类固醇诱导的幼苗茎中局部细胞伸长，这取决于下胚轴中一个独特的、允许的温度传感器。
Plants have a remarkable capacity to adjust their growth and development to elevated ambient temperatures. Increased elongation growth of roots, hypocotyls, and petioles in warm temperatures are hallmarks of seedling thermomorphogenesis. In the last decade, significant progress has been made to identify the molecular signaling components regulating these growth responses. Increased ambient temperature utilizes diverse components of the light sensing and signal transduction network to trigger growth adjustments. However, it remains unknown whether temperature sensing and responses are universal processes that occur uniformly in all plant organs. Alternatively, temperature sensing may be confined to specific tissues or organs, which would require a systemic signal that mediates responses in distal parts of the plant. Here, we show that Arabidopsis (Arabidopsis thaliana) seedlings show organ-specific transcriptome responses to elevated temperatures and that thermomorphogenesis involves both autonomous and organ-interdependent temperature sensing and signaling. Seedling roots can sense and respond to temperature in a shoot-independent manner, whereas shoot temperature responses require both local and systemic processes. The induction of cell elongation in hypocotyls requires temperature sensing in cotyledons, followed by the generation of a mobile auxin signal. Subsequently, auxin travels to the hypocotyl, where it triggers local brassinosteroid-induced cell elongation in seedling stems, which depends upon a distinct, permissive temperature sensor in the hypocotyl.