Arbuscular mycorrhiza (AM) is a widespread plant-microbe association. The mycorrhiza plays a key role in plant health and productivity by increasing mineral (especially phosphate) nutrition, and optimizing of plant hormone potential, promoting resistance of plants to root pathogens and abiotic stresses. The present study is aimed to analyze the role of the host plant in the efficiency of AM in the aspect of adaptation to low phosphate (P) level in soil. So plant polymorphism estimation, analysis of correlations and selection of plant populations are the main topics of the presented part of our research. The results can be used to select the plant genotypes with a high symbiotic potential.