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由Medicago受体激酶介导的特定物种的微生物歧视

Xiaocheng Yu¹, Jinge Liu¹, Qiulin Qin¹

¹Department of Plant and Soil Sciences, University of Kentucky, Lexington, KY 40546, USA.

Science advances

|July 31, 2024

概括

新发现的一种类似于Medicago受体的激酶作为基因屏障,防止大多数Sinorhizobium medicae菌株感染某些Medicago植物. 这种受体-激酶相互作用突出显示了豆类-类生物共生中的共同进化.

科学领域:

植物与微生物的相互作用
分子植物微生物相互作用.
共生植物生理学同生植物生理学

背景情况:

豆类-带生物共生涉及宿主范围的特异性.
Sinorhizobium meliloti和Sinorhizobium medicae是密切相关的物种,它们与Medicago植物相互作用.
医用物种在与这些根生菌物种的相互作用中表现出选择性.

研究的目的:

为了确定在Medicago-rhizobial相互作用中宿主特异性的分子基础.
阐明一种类似于Medicago受体的激酶在区分Sinorhizobium物种中的作用.
了解参与这种宿主-微生物识别的细菌因素.

主要方法:

鉴定和表征一种类似于Medicago受体的激酶.
对编码富含甘氨酸八重复蛋白的细菌基因的分析.
用于测试受体介导结节限制的功能测试.

主要成果:

确定了一种类似于Medicago受体的激酶,可以区分S. meliloti和S. medicae.
这种激酶起到基因屏障的作用,限制大多数S. medicae菌株的感染.
要激活这种宿主介导的限制,需要编码富含甘氨酸的八重复蛋白的细菌基因.

结论:

宿主植物受体类激酶在共生选择性中起着至关重要的作用.
细菌富含甘氨酸的蛋白质通过宿主植物受体进行识别.
这项研究揭示了共同进化的机制,在特定的生态中塑造了豆类-树动物相互作用.

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