CsLCD和CsDCD与黄瓜幼苗中氧化增强的盐耐受性有关
Ailing Li1, Xuelian Li1, Xinfang Chen1
1College of Horticulture, Gansu Agricultural University, Lanzhou, China.
Physiologia plantarum
|November 29, 2024
概括
氧化 (NO) 通过增加硫化 (H2S) 的产生,提高了黄瓜盐的耐受性. NO上调H2S合成基因,表明这些信号分子在植物应激反应中的关键联系.
科学领域:
- 植物生理学 植物生理学
- 分子生物学分子生物学
- 生物化学 生物化学
背景情况:
- 氧化 (NO) 和硫化 (H2S) 是植物生长和适应过程中的关键信号分子.
- 在调解盐耐受性方面,NO和H2S之间的相互作用仍然不太清楚.
- 黄瓜 (Cucumis sativus) 作为研究在非生物压力下这些相互作用的模型.
研究的目的:
- 为了阐明H2S在黄瓜中NO诱导的盐耐受性中的作用.
- 研究NO和H2S信号通路之间的相互作用背后的分子机制.
- 为了确定NO在盐应激条件下是否影响H2S生物合成.
主要方法:
- 在盐应激下,对黄瓜幼苗施加NO (酸) 和H2S (硫化) 供体 (SNP) 和H2S供体 (NaHS).
- 使用H2S清除器 (低尿素,HT) 来评估H2S的参与.
- 测量内源H2S水平,H2S合成酶活动 (LCD,DCD,CAS) 和基因表达 (CsLCD,CsDCD).
- 采用基因沉默和过度表达技术对CsLCD/CsDCD进行评估,以评估它们对盐分耐受性的影响.
主要成果:
- NO和H2S捐赠者在盐压力下显著改善了黄瓜幼苗的生长.
- 通过SNP治疗,内源H2S水平升高,H2S合成酶活性和CsLCD/CsDCD基因表达.
- 沉默CsLCD/CsDCD取消了盐耐受性,而过度表达增强了它.
- SNP对盐分耐受性的积极影响取决于CsLCD/CsDCD表达.
结论:
- 氧化增强了黄瓜幼苗的盐分耐受性,主要是通过上调H2S合成相关基因,CsLCD和CsDCD的表达.
- 这项研究确定了植物盐应激反应中NO和H2S生物合成之间的显著分子联系.
- 这些发现突出了一个新的调节途径,涉及NO介导的H2S产生的诱导,用于非生物应激适应.
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