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一系列Zymoseptoria tritici效应剂可以抑制植物免疫反应

Elisha Thynne^1,2, Haider Ali³, Kyungyong Seong⁴

¹Botanical Institute, Christian-Albrechts University, Kiel, Germany.

Molecular plant pathology

|October 12, 2024

概括

麦子中的一个重要病原体Zymoseptori tritici使用分泌的效应剂来抑制植物免疫力. 研究人员确定了新的免疫抑制因子,包括KP4和KP6家族,为真菌毒性策略提供了洞察力.

科学领域:

植物病理学植物病理学
分子植物-微生物相互作用
菌类遗传学菌类遗传学

背景情况:

Zymoseptoria tritici是一种主要的真菌病原体,影响欧洲的小麦生产.
在Z. tritici的感染过程和宿主相互作用的基础上的分子机制尚未完全理解.
了解病原体作用因子对于开发小麦的抗病策略至关重要.

研究的目的:

确定抑制植物免疫力的Z. tritici效应蛋白,特别是病原体相关分子模式 (PAMP) 触发免疫 (PTI).
研究PTI抑制效应因子的结构特征,并探索以前未被描述的效应因子家族的潜在作用.
为了获得有关Z. tritici如何在早期感染阶段操纵宿主防御的机制性见解.

主要方法:

选两个Z. tritici效应器库的PTI抑制活动.
尼科蒂亚娜本塔米亚纳中效应因子的短暂表达,随后进行PAMP治疗以评估反应性氧物种 (ROS) 生产.
使用结构预测工具来分析效应器结构,并确定PTI抑制候选人的保存签名.

主要成果:

确定了许多Z. tritici表现出PTI抑制活性的效应体.
几种效应体显示出抑制PAMP诱导的ROS产生和细胞死亡的能力.
杀手蛋白样4 (KP4) 和杀手蛋白样6 (KP6) 效应器家族的成员被发现抑制了PTI,挑战了关于它们功能的先前假设.

结论:

在感染期间,Z. tritici使用多种多样的分泌效应剂来积极抑制宿主免疫力.
鉴定KP4和KP6家族为PTI抑制剂,为真菌毒性机制提供了新的见解.
这项研究增强了我们对植物病原体相互作用的理解,并提出了小麦疾病管理的潜在目标.

关键词:

这是PTI PTI.菌类病原体的真菌病原体异种表达的异种表达.蛋白质结构家族是蛋白质的结构家族.小麦小麦小麦小麦小麦小麦小麦.

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