Abstract
Since the authors have. been engaged in the breeding of colchicine induced tetraploids in Astragalus sinicus L. The tetraploids show the gigantic appearance in many physical characteristics. They give a 30 per cent incrcase in green crop yield over the diploid progenies. Furthermore they are superior in chemical contcnts of total nitrogen, crude protein and P2O5. The undesirable features of tetraploids are the low fertility, slow growth and the increase of hard seed number. The reciplocal crosses between diploids and tetraploids were usually unsuccessful although there were obtained a few seeds from which plants with triploid or unexpected number of chromosomes were grown. Three promising strains 14-8-1, 8-2-1 and 1103 have been found by successive selection and refinement of numerous characters.
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