在梨果的火发育过程中,PbrDHAR5调解的甲酸盐氧化还原状态的动态平衡机制
Xu Zhang1, Junpeng Niu2, Yanmin Du1,3
1National Key Laboratory of Crop Genetics & Germplasm Enhancement and Utilization, Sanya Institute of Nanjing Agricultural University, College of Horticulture, Nanjing Agricultural University, Nanjing, 210095, China.
Molecular horticulture
|March 3, 2026
概括
梨发育与亚斯酸盐 (AsA) 氧化还原状态有关. PbrWRKY83-PbrDHAR5模块增强了ASA水平和冷却耐受性,但通过H2O2介导的PbrDHAR5修改破坏了这一过程.
科学领域:
- 植物生理学 植物生理学
- 生物化学 生物化学
- 分子生物学分子生物学
背景情况:
- 亚酸盐 (AsA) 氧化还原状态在梨果发育过程中起到细胞传感器的作用.
- 在植物中,AsA-Glutathione (GSH) 循环对于维持细胞氧化还原平衡和耐压能力至关重要.
研究的目的:
- 为了识别和表征涉及在梨果 scald 期间ASA氧化还原状态调节的基因.
- 阐明PbrDHAR5和PbrWRKY83调节AsA水平和冷却耐受性的分子机制.
- 调查过氧化 (H2O2) 在调节PbrDHAR5活性中的作用及其对水果的影响.
主要方法:
- 在AsA-GSH周期中对代谢物,酶活性和基因表达特征的联合分析.
- 在体外和体外酶分析以确定PbrDHAR5活性和局部化.
- 使用W-box元素分析转录因子 (TF) 表达和促进体-TF相互作用.
- 对PbrDHAR的H2O2介导的翻译后修饰 (S-硫化) 的研究5.
主要成果:
- 确定PbrDHAR5是催化脱酸盐 (DHA) 减少为AsA的关键酶,增强AsA的氧化还原状态和冷却耐受性.
- 转录因子PbrWRKY83通过与其促进体中的W-box元素结合,直接激活PbrDHAR5的表达,从而提高AsA水平.
- 过氧化 (H2O2) 诱导PbrDHAR5中催化Cys20残留物的S-硫化,抑制其活性并降低AsA的氧化还原状态.
- 这种通过H2O2介导的PbrDHAR5修改减弱了在梨发育过程中PbrWRKY83-PbrDHAR5模块的积极调节作用.
结论:
- PbrWRKY83-PbrDHAR5模块是梨果中AsA氧化还原状态和冷却耐受性的关键正调节器.
- 通过H2O2介导的PbrDHAR5的S-硫化是一种新型的调节机制,它破坏了AsA的合成,并加剧了水果烧伤.
- 了解这种监管途径可以了解预防收获后冷却损伤和改善水果质量的方法.
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