Metabolomics approach for understanding geographical dependence of soybean leaf metabolome.

The soybean plant (Glycine max) is widely used as an ingredient in various foods, nutraceuticals and cosmetics, due to their diverse bioactive compounds. Their metabolic compositions are likely affected by environmental conditions during growth. To investigate the influence of different environmental conditions on the metabolite composition of soybean leaves, we cultivated soybean (G. max Sinhwa) in the southernmost island and volcanic region of Korea, and in the central section and limestone region of the Korean peninsula. Comprehensive metabolite variations of their leaves were analyzed through 1H NMR-based metabolomics approach. With marked differences in soil compositions and climatic conditions between the two growing areas, differences in accumulations of pinitol and diverse flavonoids were noted between the soybean leaves, reflecting the distinct metabolism of soybean plants for physiological adaptation toward different environmental conditions. Therefore, the current study highlights the geographical dependences of diverse soybean leaf metabolites for developing biofunction-enhanced soybean products.