细胞因素通过调节果中去除反应性氧物种的调节来调节年龄相关的干旱反应
Xumei Jia1, Shuo Xu1, Jiangtong Wei1
1State Key Laboratory for Crop Stress Resistance and High-Efficiency Production/Shaanxi Key Laboratory of Apple, College of Horticulture, Northwest A&F University, Yangling, 712100, Shaanxi, China.
The Plant journal : for cell and molecular biology
|February 25, 2025
概括
年轻的果植物由于细胞激素 (CK) 调节,可以更好地耐受干旱. 涉及MdSPL1和MdMYB23的途径控制了CK水平,增强了年轻植物的抗干旱能力,但不是成年植物.
科学领域:
- 植物生物学 植物生物学
- 分子生物学分子生物学
- 干旱 压力生理学 干旱 压力生理学
背景情况:
- 植物对干旱等环境压力因素的反应取决于年龄.
- 植物发育过程中的干旱耐受性变化背后的分子机制,特别是从青春期到成年期的过渡,尚未完全理解.
研究的目的:
- 阐明调节果植物年龄相关干旱耐受性的分子机制.
- 为了确定关键的基因和途径,涉及到年轻和成年果植物之间的干旱反应差异.
主要方法:
- 在干旱压力下,对幼果植物和成年果植物的根活力,细胞激素水平和氧化还原状态进行比较分析.
- 基因沉默和过度表达技术用于研究CYTOKININ OXIDASE/DEHYDROGENASE5 (MdCKX5) 的功能.
- 分子测试包括酵母单混合体,双化酶和电泳性移动性转移测试,以调查基因相互作用和转录调节.
主要成果:
- 年轻的果植物与成年植物相比,表现出更高的干旱耐受性,这与更高的根活力和细胞激素 (CK) 水平有关.
- MdCKX5作为干旱耐受性的负调节器;它的沉默增强了CK积累和干旱耐受性的作用.
- 转录因子MdSPL1直接抑制MdCKX5的表达,而MdMYB23减轻了这种抑制. 干旱压力会激活年轻植物中的这种级联,从而提高CK水平和耐受性.
结论:
- 一个涉及MdSPL1,MdMYB23和MdCKX5的新型分子途径通过CK调节调解了果根的年龄依赖干旱耐受性.
- 这条通路在年轻的果植物中活跃,赋予了增强的干旱耐受性,但在成年植物中受损.
- 结果揭示了植物应激反应的发育调节的关键见解,并为改善作物弹性提供了潜在的目标.
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