茶叶虫诱导的β-元素生物合成通过 CsELE 增强茶叶植物中JA-依赖的草食动物抵抗力
Lanxin Luo1, Ting Gao1, Yanni Deng1
1National Key Laboratory for Tea Plant Germplasm Innovation and Resource Utilization, Anhui Agricultural University, Hefei, P.R. China.
Plant, cell & environment
|May 19, 2025
概括
茶叶植物在被虫攻击时产生β-Elemene挥发性物质,从而提高了耐药性. 这项研究确定了参与这一关键植物防御机制的酶CsELE和转录因子MYC2a.
科学领域:
- 植物生物化学 植物生物化学
- 化学生态化学生态学
- 分子生物学分子生物学
背景情况:
- 草食动物诱导的植物挥发物对植物防御和适应至关重要.
- 触发茶叶植物 (Camellia sinensis) 对茶叶虫 (Toxoptera aurantii) 等害虫的这些反应的特定挥发性物质和机制尚未完全理解.
研究的目的:
- 研究茶叶植物对虫的抗性所涉及的生化途径和挥发性物质.
- 确定虫诱导的挥发性生物合成中的关键酶和调节因素,以及它们在植物防御中的作用.
主要方法:
- 使用LC-MS和DESI-IMS进行斯酸 (JA) 的量化.
- 通过GC-MS识别虫诱导的挥发性物质.
- 对CsELE的酶活性测定,包括过度表达和基因沉默.
- 使用双露西法酶和Y1H试验对基因表达调节的分析.
主要成果:
- 虫食诱导了"Shuchazao"茶中的β-Elemene积累,增强了虫的抵抗力.
- 确定了合成酶CsELE作为负责β-Elemene生物合成的酶.
- CsELE活动直接影响了茶叶植物对虫的抵抗力.
- 发现转录因子MYC2a可以在JA信号通路内积极调节CsELE表达.
结论:
- 这项研究阐明了β-Elemene生物合成的机制及其在茶叶植物对虫的防御中的作用.
- 它确定了CsELE作为一个关键酶,MYC2a作为JA介导的防御反应中的关键调节器.
- 提供了关于在生物压力下植物挥发物的转录调节的新见解.
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