根结线虫效应器Mi2G02劫持了宿主植物三体的转录因子,以促进线虫寄生
Jianlong Zhao1, Kaiwei Huang1, Rui Liu1
1State Key Laboratory of Vegetable Biobreeding, Institute of Vegetables and Flowers, Chinese Academy of Agricultural Sciences, Beijing 100081, China.
Plant communications
|September 24, 2023
概括
根结线虫使用效应器来感染植物. 这项研究揭示了Mi2G02效应器如何破坏植物蛋白GT-3a的稳定性,促进线虫寄生和作物损害.
科学领域:
- 植物 - 遗传动物相互作用
- 分子植物病理学 分子植物病理学
- 农业昆虫学 农业昆虫学
背景情况:
- 根结线虫 (RKN) 通过诱导植物养细胞,造成了重大的农业损失.
- 线虫效应者对寄生虫至关重要,但它们的目标和机制尚不清楚.
- 了解效应因子的功能是开发耐药作物的关键.
研究的目的:
- 为了调查Meloidogyne incognita效应剂Mi2G02在植物寄生症中的作用.
- 确定Mi2G02的宿主目标并阐明其作用机制.
- 了解RKN如何操纵宿主转录因子来养细胞发育.
主要方法:
- 在Arabidopsis thaliana中进行RNA干扰 (RNAi),以评估Mi2G02的功能.
- 在A. thaliana进行子宫外表达研究,以评估Mi2G02对植物生长和易感性的影响.
- 对A. thaliana GT-3a转录因子进行基因操纵 (淘汰赛和过度表达).
- 蛋白质酶抑制试验用于研究Mi2G02对GT-3a蛋白质稳定性的影响.
- 基因表达分析 (TOZ和RAD23C) 以了解下游效应.
主要成果:
- 来自宿主的Mi2G02RNAi损害了A. thaliana的巨细胞发育.
- 宫外表达的Mi2G02增强了根生长,增加了对M.隐形菌的敏感性.
- A. thaliana GT-3a 淘汰会减少养地点的发展和蛋质量生产.
- GT-3a过度表达增加了易感性和根生长.
- 通过抑制26S蛋白酶体通路,Mi2G02稳定了GT-3a,抑制了TOZ和RAD23C的表达.
结论:
- RKN效应器Mi2G02直接准并稳定植物转录因子GT-3a.
- Mi2G02抑制了宿主26S蛋白酶体通路,防止GT-3a降解.
- 这种稳定抑制下游基因表达 (TOZ,RAD23C),重新编程宿主细胞用于线虫食.
- 这项研究揭示了一种用于植物寄生虫的宿主蛋白质溶解以效应体为媒介的新机制.
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