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GIGANTEA-LATE ELONGATED HYPOCOTYL复合体调节类植物对干旱的耐受性和干旱诱导的开花
Tian-Liang Zhang1, Min Chen1, Yong-Huan Wan1
1National Key Laboratory for Germplasm Innovation & Utilization of Horticultural Crops, College of Horticulture and Forestry Science, Huazhong Agricultural University, Wuhan, 430070, China.
Journal of integrative plant biology
|July 3, 2025
概括
花巨人 (GI) 蛋白质变体调节开花和耐旱性. 通过激活下游基因,CiGIα增强了干旱敏感性,并促进了开花,而CiGIβ没有显著的影响.
科学领域:
- 植物生物学 植物生物学
- 分子生物学分子生物学
- 无生物性压力生理学生理学
背景情况:
- 干旱是主要的非生物压力,限制了植物生长和作物产量.
- 众所周知,GIGANTEA (GI) 能调节模型植物的开花和应激反应,但它在诸如类的非模型物种中的作用尚不清楚.
研究的目的:
- 调查 (Citrus limon) 中GIGANTEA (GI) 同类的功能,重点关注它们在开花和耐旱性方面的作用.
- 阐明这些过程的CiGI介导调节背后的分子机制.
主要方法:
- 鉴定和表征Citrus limon GIGANTEA同类物 (CiGI) 和它们的替代拼接变体 (CiGIα,CiGIβ).
- 在烟草和类植物中进行过度表达研究,以评估干旱压力和开花时间下的表型变化.
- 对基因表达,蛋白质复合体形成和促进体结合试验的分析 (CiGI,CiLHY,CiNF-YA1,CiFT,CiNADP-ME2).
主要成果:
- 确定了两种CiGI转录,即CiGIα和CiGIβ. 过度表达CiGIα导致烟草和类植物早期开花,并增加干旱敏感性.
- 降低CiGI的调节增强了类植物的干旱耐受性.
- 该CiGI-CiLHY复合体激活CiNF-YA1,这反过来调节CiNADP-ME2,增加活性氧物种 (ROS) 和干旱敏感性.
- CiGI-CiLHY也激活了CiFT,这表明它在花期调节中的作用. 外源ROS应用模拟了这些效应.
结论:
- 巨 (CiGI) 在通过替代拼接来调节开花时间和耐旱性方面发挥了双重作用.
- 通过CiNF-YA1 / CiNADP-ME2通路,CiGI-CiLHY复合物调节干旱耐受性,并通过CiFT激活影响开花.
- 这项研究揭示了CiGI在控制花和干旱反应方面的一种新型分子机制.
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