一种基拉尼奥尔合成酶通过茶叶植物的替代拼接来调节植物防御
Hao Jiang1, Mengting Zhang1, Feng Yu1
1State Key Laboratory of Tea Plant Biolog and Utilization, Anhui Agricultural University, 130 West Changjiang Road, Hefei 230036, China.
Horticulture research
|October 27, 2023
概括
茶叶植物通过CsTPS1及其替代拼接变体CsTPS1-AS.合成关键芳香化合物格拉尼奥尔. CsTPS1-AS在基拉尼奥尔的积累和植物对病原体的防御中起着至关重要的作用.
科学领域:
- 植物生物化学 植物生物化学
- 分子生物学分子生物学
- 植物病理学 植物病理学
背景情况:
- 格拉尼奥尔是茶叶植物中主要的芳香化合物,有助于它们的气味.
- 茶叶植物中兰醇的生物合成和压力诱导的功能尚不清楚.
- 合成酶,如CsTPS1,参与制造芳香化合物.
研究的目的:
- 调查合成酶 (CsTPS1) 和其替代拼接异型 (CsTPS1-AS) 在茶叶植物中基拉尼醇生物合成中的作用.
- 为了确定CsTPS1和CsTPS1-AS在对病原体感染的反应中的生理功能.
- 阐明替代拼接在植物防御机制中的作用.
主要方法:
- 在体外酶测试中,使用格拉尼尔酸盐 (GPP) 作为基质.
- 在茶叶植物中对CsTPS1和CsTPS1-AS的基因沉默.
- 测量杰拉尼奥尔含量和评估对真菌病原体 (Colletotrichum gloeosporioides和Neopestalotiopsis sp. 菌种) 的抗病性. ) 的情况.
- 对与防御相关的基因表达 (PR1,PR2) 和酸 (SA) 途径基因的分析.
主要成果:
- 两种CsTPS1和CsTPS1-AS蛋白质都在体外催化了基拉尼的形成.
- CsTPS1-AS表达是由真菌感染引起的.
- 沉默CsTPS1-AS显著降低了geraniol含量,并增加了对病原体的敏感性.
- 沉默CsTPS1并没有显著影响基拉尼奥尔含量或病原体耐药性.
- CsTPS1-AS沉默导致防御基因 (PR1,PR2) 和SA通路基因的表达减少.
结论:
- CsTPS1参与基拉尼奥尔生物合成,而其替代拼接异型,CsTPS1-AS,在调节基拉尼奥尔积累和植物防御方面发挥着关键作用.
- CsTPS1的替代拼接是调节植物疾病耐药性的关键机制.
- 这项研究提供了对日拉尼生物合成和单合成酶在植物免疫中的作用的新见解.
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