Light-harvesting chlorophyll a/b-binding proteins, positively involved in abscisic acid signalling, require a transcription repressor, WRKY40, to balance their function
Light-harvesting chlorophyll a/b-binding proteins, positively involved in abscisic acid signalling, require a transcription repressor, WRKY40, to balance their function
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光捕获叶绿素 a/b 结合蛋白积极参与脱落酸信号传导，需要转录抑制子 WRKY40 来平衡其功能
DOI：
10.1093/jxb/ert307
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发表时间：
2013-12-01
影响因子：
6.9
通讯作者：
Zhang, Da-Peng
中科院分区：
文献类型：
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作者：
Liu, Rui;Xu, Yan-Hong;Zhang, Da-Peng
捕光叶绿素a/b结合（LHCB）蛋白是光系统II捕光复合物的脱辅基蛋白。在本研究中，我们观察到，任何的6个LHCB基因的下调导致脱落酸（阿坝）不敏感的表型在种子萌发和萌发后的生长，表明LHCB蛋白积极参与这些发育过程中响应阿坝。阿坝是必需的不同LHCB成员和生理高水平的阿坝增强LHCB表达的充分表达。LHCB成员被证明是ABA响应性WRKY结构域转录因子WRKY 40的靶标，WRKY 40抑制LHCB表达以平衡LHCB在阿坝信号传导中的正功能。这些发现表明，阿坝是一种诱导剂，其至少部分地通过在与光合作的胁迫条件下抑制WRKY 40转录阻遏物来微调LHCB表达，这使得植物能够适应环境挑战。
The light-harvesting chlorophyll a/b-binding (LHCB) proteins are the apoproteins of the light-harvesting complex of photosystem II. In the present study, we observed that downregulation of any of the six LHCB genes resulted in abscisic acid (ABA)-insensitive phenotypes in seed germination and post-germination growth, demonstrating that LHCB proteins are positively involved in these developmental processes in response to ABA. ABA was required for full expression of different LHCB members and physiologically high levels of ABA enhanced LHCB expression. The LHCB members were shown to be targets of an ABA-responsive WRKY-domain transcription factor, WRKY40, which represses LHCB expression to balance the positive function of the LHCBs in ABA signalling. These findings revealed that ABA is an inducer that fine-tunes LHCB expression at least partly through repressing the WRKY40 transcription repressor in stressful conditions in co-operation with light, which allows plants to adapt to environmental challenges.