Integration of low temperature and light signaling during cold acclimation response in Arabidopsis
Integration of low temperature and light signaling during cold acclimation response in Arabidopsis
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DOI：
10.1073/pnas.1107161108
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发表时间：
2011-09-27
影响因子：
11.1
通讯作者：
Salinas, Julio
中科院分区：
文献类型：
--
作者：
Catala, Rafael;Medina, Joaquin;Salinas, Julio
某些植物通过对低温的适应来提高其抗冻性，这一适应过程被称为冷驯化。光已被证明是完全冷驯化所必需的，尽管光和冷信号如何整合和相互作用以增强抗冻性仍然知之甚少。在这里，我们表明，HY 5水平的调节低温转录，通过CBF和ABA的独立途径，并postpermeabilitationally，通过蛋白质稳定，通过核耗竭COP 1。此外，我们证明HY 5正调控冷诱导的基因表达通过Z盒和其他顺式作用元件，确保冷驯化的完整发展。这些发现揭示了HY 5，COP 1和Z-box在拟南芥对低温反应中的意想不到的功能，提供了关于冷和光信号如何整合以优化植物在冷冻温度下生存的见解，并揭示了植物进化以响应和适应其波动的自然环境的分子机制的复杂性。
Certain plants increase their freezing tolerance in response to low nonfreezing temperatures, an adaptive process named cold acclimation. Light has been shown to be required for full cold acclimation, although how light and cold signals integrate and cross-talk to enhance freezing tolerance still remains poorly understood. Here, we show that HY5 levels are regulated by low temperature transcriptionally, via a CBF- and ABA-independent pathway, and posttranslationally, via protein stabilization through nuclear depletion of COP1. Furthermore, we demonstrate that HY5 positively regulates cold-induced gene expression through the Z-box and other cisacting elements, ensuring the complete development of cold acclimation. These findings uncover unexpected functions for HY5, COP1, and the Z-box in Arabidopsis response to low temperature, provide insights on how cold and light signals integrate to optimize plant survival under freezing temperatures, and reveal the complexity of the molecular mechanisms plants have evolved to respond and adapt to their fluctuating natural environment.