细菌在植物中建立了对毒性至关重要的水性生存空间
Xiu-Fang Xin1, Kinya Nomura1, Kyaw Aung1,2
1Department of Energy, Plant Research Laboratory, Michigan State University, East Lansing, Michigan 48824, USA.
Nature
|November 25, 2016
概括
高湿度会导致植物疾病,因为它会使叶面湿. 细菌毒素可以利用这一点, 将无害的细菌转化为病原体,
科学领域:
- 植物病理学
- 微生物生态学
- 分子植物微生物相互作用
背景情况:
- 高湿度对植物界的疾病产生重大影响.
- 湿度在植物病变中的作用背后的分子机制在很大程度上是未知的.
- 之前的研究集中在免疫抑制作为细菌感染的主要因素.
研究的目的:
- 研究湿度对植物疾病发展的影响的分子基础.
- 除了免疫抑制之外,还要找出涉及植物圈细菌感染的新机制.
- 探索细菌效应器在高湿度下建立有利感染条件的作用.
主要方法:
- 使用了Pseudomonas syringae (P. syringae) 和Arabidopsis thaliana的模型.
- 研究了细菌效应器HopM1及其宿主目标AtMIN7的功能.
- 使用四重突变, 缺陷在AtMIN7和模式触发免疫.
- 评估了植物圈微生物群的依赖湿度的变化.
主要成果:
- 证明在高湿度下,病原体驱动的水性细胞形成对植物圈感染至关重要.
- 表明像HopM1这样的细菌效应器可以诱导细胞内水的积累.
- 证明这些效应剂可以在高湿度条件下将非致病性P.注射器转化为致病性病原体.
- 在易受影响的Arabidopsis突变体中观察到内生细菌群体的依赖湿度的失活性.
结论:
- 建立了一个新的概念框架,以了解植物与细菌的相互作用,强调湿度的作用.
- 突出了由细菌效应物诱导的质化作为一种关键的毒性策略的重要性.
- 揭示了湿度和植物微生物组的稳定性之间的联系.
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