Root exudates are important mediators of plant–microbiome interactions. Recent pioneering studies on various aerial root plants, including cereals, have shown that carbohydrate-rich mucilage can enrich diazotrophs and increase host nitrogen utilization and growth. Moreover, non-diazotrophic “gatekeeper” microorganisms in mucilage help defend against pathogenic and environmental microbes. These findings highlight the active role of root exudates in mediating plant–microbiome interactions to maintain microbial homeostasis in the rhizosphere. However, little is known about the specific mechanisms by which root exudates modulate the functional microbiome and homeostasis in rhizosphere microhabitats. Here, we propose the typical and stable biointeractions of four plant–specific aerial root mucilage–probiotic systems as a model for understanding root exudate–functional microbiome interaction. We anticipate that this model can provide fundamental biological insights into rhizosphere interactions.

中文翻译：

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用于研究根系分泌物与功能微生物组根际相互作用的益生菌模型


根系分泌物是植物-微生物组相互作用的重要介质。最近对各种气根植物（包括谷物）的开创性研究表明，富含碳水化合物的粘液可以富集重氮营养生物并增加宿主氮的利用和生长。此外，粘液中的非重氮营养“守门人”微生物有助于抵御病原微生物和环境微生物。这些发现强调了根系分泌物在介导植物-微生物组相互作用以维持根际微生物稳态方面的积极作用。然而，人们对根系分泌物调节根际微生境中功能性微生物组和体内平衡的具体机制知之甚少。在这里，我们提出了四种植物特异性气生根粘液-益生菌系统的典型和稳定的生物相互作用，作为理解根分泌物-功能微生物组相互作用的模型。我们预计该模型可以为根际相互作用提供基本的生物学见解。