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The Arabidopsis transcription factor LBD15 mediates ABA signaling and tolerance of water-deficit stress by regulating ABI4 expression.
The Plant Journal ( IF 7.2 ) Pub Date : 2020-08-03 , DOI: 10.1111/tpj.14942
Zhaolai Guo 1, 2 , Huini Xu 2 , Qidong Lei 2 , Jiancan Du 1, 3 , Cheng Li 1, 3, 4 , Chongde Wang 5 , Yunqiang Yang 1, 3 , Yongping Yang 1, 3, 4 , Xudong Sun 1, 3
Affiliation  

To survive, sessile plants must adapt to grow and develop when facing water‐deficit stress. However, the molecular mechanisms underlying fine‐tuning of the antagonistic action between stress response and growth remain to be determined. Here, plants overexpressing Lateral Organ Boundaries Domain 15 (LBD15) showed abscisic acid (ABA) hypersensitivity and tolerance of water‐deficit stress, whereas the loss‐of‐function mutant lbd15 presented decreased sensitivity to ABA and increased sensitivity to water‐deficit stress. Further analysis revealed that LBD15 directly binds to the promoter of the ABA signaling pathway gene ABSCISIC ACID INSENSITIVE4 (ABI4) to activate its expression, thereby forming an LBD15–ABI4 cascade to optimally regulate ABA signaling‐mediated plant growth and tolerance of water‐deficit stress. In addition, drought stress‐induced ABA signaling promoted LBD15 expression, which directly activates expression of ABI4 to close stomata. As a result, water loss is reduced, and then water‐deficit stress tolerance is increased. The results of this study reveal a molecular mechanism by which LBD15 coordinates and balances plant growth and resistance to water‐deficit stress.

中文翻译:

拟南芥转录因子LBD15通过调节ABI4表达来介导ABA信号传导和耐缺水胁迫。

为了生存,无柄植物必须面对缺水胁迫适应生长和发育。然而,在应激反应和生长之间的拮抗作用的微调背后的分子机制仍有待确定。在这里,过度表达侧向器官边界域15(LBD15)的植物表现出脱落酸(ABA)超敏性和对水分亏缺胁迫的耐受性,而功能丧失的突变体lbd15表现出对ABA的敏感性降低而对水分亏缺胁迫的敏感性增加。进一步的分析表明,LBD15直接与ABA信号通路基因ABSCISIC ACID INSENSITIVE4(ABI4)的启动子结合以激活其表达,从而形成LBD15–ABI4级联以最佳调节ABA信号介导的植物生长和水分胁迫的耐受性。此外,干旱胁迫诱导的ABA信号传导促进了LBD15表达,这直接激活了ABI4的表达以关闭气孔。结果,减少了水分流失,然后提高了缺水胁迫耐受性。这项研究的结果揭示了一种分子机制,通过该分子机制,LBD15可以协调和平衡植物的生长以及对水分缺乏胁迫的抵抗力。
更新日期:2020-08-03
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