雅斯莫纳酸生物合成酶艾伦氧化物循环酶2介导冷耐受性和病原体耐药性
Lei Yang1, Qiguo Sun1,2, Bohao Geng1
1College of Grassland Science, Nanjing Agricultural University, Nanjing 210095, China.
Plant physiology
|July 1, 2023
概括
亚氧化物循环酶2 (AOC2) 基因通过促进莉酸 (JA) 生产来增强植物抗寒和病原体抵抗力. 这导致植物的耐受性和防御反应增加.
科学领域:
- 植物科学 植物科学
- 分子生物学分子生物学
- 生物化学 生物化学
背景情况:
- 素酸 (JA) 对于植物对生物和非生物压力的反应至关重要.
- 艾伦氧化物循环酶 (AOC) 酶合成JA,但AOC2在应激适应中的特定作用需要进一步研究.
研究的目的:
- 研究AOC2基因在植物寒冷和病原体耐受性中的功能.
- 阐明JA生物合成在调节应激反应通路中的作用.
主要方法:
- 鉴定和描述Medicago sativa亚种的特征. falcata AOC2 (MfAOC2) 和它的同类物MtAOC2.2. 这两种类型的产物.
- 在Medicago truncatula中MfAOC2的异质表达和aoc2突变的产生.
- 分析JA水平,下游基因表达,C重复结合因子 (CBF) 转录水平,以及在寒冷和病原体压力下抗氧化酶活动.
主要成果:
- MfAOC2表达增强了对Rhizoctonia solani的耐寒性和耐药性,与增加的JA水平和下游基因表达相关.
- aoc2突变体表现出降低的耐寒性和病原体耐药性,JA积累减少,JA响应基因表达较低.
- 在aoc2突变或外源甲基斯酸盐应用中MfAOC2的表达挽救了突变表型,包括耐寒性和CBF转录水平.
- 表达MfAOC2的线条显示了较高的CBF转录水平和抗氧化活性在寒冷下,而aoc2突变显示了较低的水平.
结论:
- MfAOC2和MtAOC2积极调节JA生物合成,增强植物对寒冷和病原体攻击的耐受性.
- 由AOC2调解的JA信号,在激活CBF依赖的冷反应和抗氧化剂防御机制方面发挥着关键作用.
- AOC2-JA通路对于协调植物防御应对非生物 (寒冷) 和生物 (病原体) 压力的反应至关重要.
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