Molecular cloning of methionine-metaboly correlated cDNA in Astragalus melilotoides Pall.variant line and its expression in E.coli Establishment of a high efficient regeneration system from internode segments of seedling in Astragalus meliloides Pall. STUDY ON PLANT REGENERATION AND THEIR INFLUENCING FACTORS IN MONOCELL CULTURE OF ASTRAGALUS MELILOTOIDES PLL.