Abstract: The symbiosis formed by arbuscular mycorrhizal fungi,rhizobia and legumes is a special association in plant-microbe symbiosis.In this paper,the research advances in the nutritional relationships between microorganisms and plants,effects of co-inoculation with rhizobia and arbuscular mycorrhizal fungi on legumes,factors affecting the effectiveness of the co-inoculation,and molecular interactions in arbuscular mycorrhizal fungi-legumes-rhizobia symbiosis were reviewed,and the problems needed to be further studied as well as the prospects of basic research and application of this symbiosis were discussed.

Key words: Cu, Trifolium repens, Growth, Soil enzyme activity