摘要： Compact calli derived from immature spikelet of a foxtail millet variety—Jigu 11cann't be directly used for protoplast isolation because of its firm physical structure,and must beloosened with subculturing in M₁,M₂ and M₃ media successively and altering these media compo-sitions.The loosened calli can be selected from the regulation and used for protoplast isolationsuccessfully.Rate of protoplast division in KM₈P medium was 12.3—33.5%.Calli derivedthrough protoplast division are loose and cann't be used directly for plan regeneration because ofits soft physical structure.When they were subcultured in N₆—1,N₆—2,N₆—3 and N₆—4 media,in which the media compositions were changed,the compact calli were obtained and 129 plantletswere regenerated from them.101 plants,which grew to maturity after transplanting the plantletsinto field,exhibited sterility in some degree.Most of the subsequent lines derived from the regen-erated plants were sterile and only two lines could get normal reproduction.

关键词: foxtail millet (Setaria italica Beau.), protoplast, plant regeneration, genetic varia-tion