Granada Agudelo Margarita, Ruiz Bryan, Capela Delphine, Remigi Philippe
Laboratoire des Interactions Plantes Microbes Environnement (LIPME), Université de Toulouse, INRAE, CNRS, Castanet-Tolosan, France.
Front Plant Sci. 2023 Oct 9;14:1277262. doi: 10.3389/fpls.2023.1277262. eCollection 2023.
Rhizobia are soil bacteria that can establish a nitrogen-fixing symbiosis with legume plants. As horizontally transmitted symbionts, the life cycle of rhizobia includes a free-living phase in the soil and a plant-associated symbiotic phase. Throughout this life cycle, rhizobia are exposed to a myriad of other microorganisms that interact with them, modulating their fitness and symbiotic performance. In this review, we describe the diversity of interactions between rhizobia and other microorganisms that can occur in the rhizosphere, during the initiation of nodulation, and within nodules. Some of these rhizobia-microbe interactions are indirect, and occur when the presence of some microbes modifies plant physiology in a way that feeds back on rhizobial fitness. We further describe how these interactions can impose significant selective pressures on rhizobia and modify their evolutionary trajectories. More extensive investigations on the eco-evolutionary dynamics of rhizobia in complex biotic environments will likely reveal fascinating new aspects of this well-studied symbiotic interaction and provide critical knowledge for future agronomical applications.
根瘤菌是一类土壤细菌，能够与豆科植物建立固氮共生关系。作为水平传播的共生体，根瘤菌的生命周期包括在土壤中的自由生活阶段和与植物相关的共生阶段。在整个生命周期中，根瘤菌会接触到大量与其相互作用的其他微生物，这些微生物会调节它们的适应性和共生性能。在这篇综述中，我们描述了根瘤菌与其他微生物之间可能在根际、结瘤起始过程以及根瘤内发生的相互作用的多样性。其中一些根瘤菌与微生物的相互作用是间接的，当某些微生物的存在以一种反馈影响根瘤菌适应性的方式改变植物生理学时就会发生这种间接相互作用。我们进一步描述了这些相互作用如何对根瘤菌施加显著的选择压力并改变它们的进化轨迹。对复杂生物环境中根瘤菌的生态进化动态进行更广泛的研究，可能会揭示这种经过充分研究的共生相互作用中令人着迷的新方面，并为未来的农业应用提供关键知识。
