Blue Light Perception and Signal Transduction Mechanisms in Plants

9408166衣架植物的发育受到许多环境刺激的影响，包括光、温度和重力。在这些刺激中，光尤其重要，因为除了为光合作用提供能量外，它还调节几乎所有的发育阶段。光调控发育的例子包括萌发、茎生长、叶和根的发育、热带反应、叶绿体发育、分枝和开花诱导。植物通过多种感光系统对不同质量的光做出反应。这项提议的长期目标是在细胞和分子水平上确定蓝光是如何被植物感知并转化为经修饰的生长反应的。这项研究将集中在拟南芥蓝光光形态发生突变体Blu1、Blu2和Blu3上，它们已经被证明在几个重要的蓝光反应中是不足的。这项研究的主要目的是确定蓝光依赖信号转导所需基因产物的性质和作用机制。第二个目标是继续利用三个BLU突变体与包括光敏色素缺失突变体在内的其他光形态发生突变体之间的各种双突变体进行生理和遗传学实验，以确定不同光敏系统之间的功能相互作用。这项工作将提供关于控制光形态建成的复杂调控事件网络的重要新知识，并将有助于阐明光以及可能的其他环境刺激控制植物发育的机制。***

9408166 Hangarter Plant development is influenced by many environmental stimuli, including light, temperature and gravity. Of these stimuli, light is of particular importance because it regulates nearly all stages of development in addition to supplying energy for photosynthesis. Examples of light-regulated development include germination, stem growth, leaf and root development, tropic responses, chloroplast development, branching, and flower induction. Plants respond to different qualities of light through the action of multiple photosensory systems. The long-term objective of this proposal is to determine at the cellular and molecular level how blue light in particular is perceived by plants and converted into modified growth responses. The research will focus on the Arabidopsis blue light photomorphogenic mutants blu1, blu2 and blu3 which have been shown to be deficient in several important blue light responses. The major objective of the proposed research is to identify the nature and mechanism of action of the gene products required for blue light-dependent signal transduction. A second objective is to continue conducting physiological and genetic experiments using various double mutants between the three blu mutants and other photomorphogenic mutants, including phytochrome-deficient mutants, in order to identify functional interactions between different photosensory systems. This work will provide significant new knowledge about the complex network of regulatory events that control photomorphogenesis and will help elucidate the mechanisms by which light, and possibly other environmental stimuli, control plant development. ***