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在XEG1和XLP1基因上的特定选择与宿主范围和Phytophthora的适应性相关

Qi Zhang^1,2, Xi Chen^1,2, Haixia You^1,2

¹Department of Plant Pathology, Nanjing Agricultural University, Nanjing, 210095, China.

Nature communications

|April 16, 2025

概括

植物植物群 (Phytophthora) 是一种植物群.

科学领域:

植物病理学植物病理学
进化生物学进化生物学
分子生物学分子生物学

背景情况:

在宿主相互作用中,Phytophthora 种类利用糖特定的内葡萄糖酶 (XEG1) 和其对应物,Phytophthora 分泌XEG1-Like 蛋白 (PsXLP1).
XEG1在植物细胞壁降解中起作用,而XLP1则作为对宿主抑制剂的诱蛋白.

研究的目的:

研究Phytophthora中的XEG1/XLP1基因对的进化动态.
确定XEG1/XLP1进化,宿主适应和病原体宿主范围之间的联系.

主要方法:

在Phytophthora物种中对XEG1/XLP1基因对进行比较基因组学和遗传学分析.
在XEG1/XLP1基因内识别和分析积极选择位.
在关键的Phytophthora物种 (P. sojae,P. capsici) 中进行突变分析,以评估病原性.
多变量统计分析以将遗传变异与宿主范围相关联.

主要成果:

XEG1/XLP1基因对起源于Phytophthora内部,并由优先选择下的功能分歧驱动,进化为特定的基因.
在XEG1/XLP1中,正选择位与Phytophthora宿主范围的变化有关.
在P. sojae和P. capsici的关键选择部位的突变降低了病原性,特别影响了P. capsici的殖民.
自然Phytophthora种群在这些地点表现出突变,表明正在进行的进化压力.

结论:

对XEG1/XLP1基因对的基因特异性选择压力对Phytophthora的宿主适应和宿主范围至关重要.
在XEG1/XLP1内的积极选择位点的进化修饰直接影响Phytophthora的致病性和宿主专业化.
XEG1/XLP1系统代表了一个由宿主-病原体相互作用和持续的选择性力量塑造的动态进化舞台.

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