Integration of low temperature and light signaling during cold acclimation response in Arabidopsis

被引:317
作者
Catala, Rafael [1 ]
Medina, Joaquin [1 ]
Salinas, Julio [1 ]
机构
[1] CSIC, Dept Biol Medioambiental, Ctr Invest Biol, Madrid 28040, Spain
关键词
UV-B RESPONSE; GENE-EXPRESSION; FREEZING TOLERANCE; NEGATIVE REGULATOR; BZIP PROTEIN; HY5; THALIANA; PHYTOCHROME; PROMOTERS; DROUGHT;
D O I
10.1073/pnas.1107161108
中图分类号
O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];
学科分类号
07 ; 0710 ; 09 ;
摘要
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.
引用
收藏
页码:16475 / 16480
页数:6
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