Legumes are in constant dynamic interactions with rhizobia and arbuscular mycorrhizal (AM) fungi which mutually benefi t the partners. Legumes provide the carbon energy to the microbes, and they in turn provide the nutrients such as nitrogen and phosphorus. The growth of these symbionts largely depends on the secretions of the legume roots which include both high and low molecular weight compounds. These molecules also act as cues in plant-microbe signaling and recognition. A cascade of reactions take place between the legume and the microbe before specifi c refi ned symbiotic partnership manifests mutually benefi ting both the partners. Here, we provide an overview of the functions of legume root exudates with emphasis on the interactions between legume and rhizobia.
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