lncRNA MtCIR2通过调节CBF/DREB1基因集群来积极调节植物冷耐受性
Mingui Zhao1, Rui Tian1,2, Xiaohan Sun1,2
1State Key Laboratory of Vegetation and Environmental Change, Institute of Botany, The Chinese Academy of Sciences, Beijing, People's Republic of China.
Plant, cell & environment
|May 30, 2023
概括
一种新的长非编码RNA,MtCIR2,通过调节CBF/DREB1基因并增加可溶性糖含量,提高了Medicago truncatula的冷耐受性.
科学领域:
- 植物分子生物学 植物分子生物学
- 植物应激反应的应激反应
- 遗传学和基因组学 遗传学和基因组学
背景情况:
- 长非编码RNAs (lncRNAs) 越来越多地被认为是它们在植物环境应激反应中的作用.
- CBF/DREB1转录因子对于植物的寒冷应激适应至关重要,但这些因子的lncRNA调节尚不清楚.
- 识别新的监管要素是理解和改善植物耐寒性的关键.
研究的目的:
- 为了识别和表征参与冷应激反应和冷耐受性的新型lncRNAs,在Medicago truncatula.
- 阐明一种新发现的冷反应性lncRNA (MtCIR2) 在CBF/DREB1基因和冷耐受性上的调节机制.
- 研究MtCIR2对植物新陈代谢,特别是糖代谢的影响.
主要方法:
- 在Medicago truncatula中识别和表征对寒冷反应的lncRNA.
- 定量实时PCR分析在寒冷压力下基因表达模式.
- 在M. truncatula中对MtCIR2进行基因操纵 (过度表达和突变),以评估其功能.
- 在冷条件下测量植物生存率和细胞膜损伤.
- 对基因表达特征和代谢途径的分析,包括多糖代谢和可溶糖含量.
主要成果:
- 在Medicago truncatula的一个主要的冷耐受性QTL区域中发现了一种新型的冷反应性lncRNA,MtCIR2.
- MtCIR2表达对寒冷的反应比MtCBF/DREB1基因更快.
- 过度表达MtCIR2增强了结耐受性,增加了存活率和减少了细胞膜损伤,而MtCIR2突变体显示出增加了对寒冷的敏感性.
- MtCIR2积极调节了MtCBF/DREB1基因的表达.
- MtCIR2影响了多糖代谢过程,并增加了植物中的可溶糖含量.
结论:
- MtCIR2在Medicago truncatula对结压力的耐受性方面发挥着显著的积极调节作用.
- 这种调节通过调节MtCBF/DREB1基因表达和增强糖代谢来调节.
- MtCIR2是改善豆类和其他植物物种耐寒性的潜在目标.
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