非典型的根茎菌会在相同的豆类宿主上触发结节和病原体
Kévin Magne1,2,3, Sophie Massot1,2, Tifaine Folletti4
1Université Paris-Saclay, CNRS, INRAE, Université Evry, Institute of Plant Sciences Paris-Saclay, 91190, Gif sur Yvette, France.
Nature communications
|October 27, 2024
概括
研究人员发现了一种新型细菌菌株,它既能引起疾病,也能在豆类中形成结节. 这一发现挑战了先前对草豆共生和寄生虫相互作用的理解.
科学领域:
- 微生物学 微生物学
- 植物病理学 植物病理学
- 同生相互作用的交互.
背景情况:
- 共生主义和互惠主义往往是从寄生性祖先进化而来的.
- 豆-豆相互作用通常被研究为共生或致病性,而不是在同一宿主上.
- 在一个宿主上单一根茎菌株的双重致病和结节能力以前没有被记录.
研究的目的:
- 在豆类宿主上分离和表征一种表现出致病性和结节性能力的细菌菌株.
- 研究根茎菌中这种双重能力的基因组和表型基础.
- 为了确定与这些混合相互作用表型相关的细菌菌株.
主要方法:
- 从Medicago结节中分离细菌菌株.
- 细菌与各种豆类基因型相互作用的表型特征.
- 基因组分析和分离菌株的基因组分类.
- 与已知的根茎生物群体进行比较分析.
主要成果:
- 从Medicago结节中分离了T4菌株,证明了双重致病和结节能力.
- T4菌株在竞争中诱导了无效的结节,并充当寄生虫,导致特定豆类基因型的植物死亡.
- 这种双重能力被观察到在反转重复缺少类的多种豆类物种中.
- 基因组分析将T4置于非共生性Ensifer adhaerens组内,与具有类似双重特征的另一种菌株 (T173) 聚集在一起.
- 确定一个独特的细菌类,包括这些双能力的根茎菌株.
结论:
- 已经确定了一种新型细菌类的根茎菌,其特点是能够在相同的豆类宿主上充当病原体和共生体.
- 相互作用的结果取决于植物的发育阶段.
- 这一发现扩大了对根茎豆相互作用中的进化途径和表型可塑性的理解.
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