甘薯新品种“渝薯20”的选育研究

STUDIES ON THE BREEDING OF "YUSHU 20",A NEWLY-EVOLVED VARIETY OF SWEET POTATO

介绍了对甘薯食用，食品加工用新品种“渝薯２０”的生产力和主要经济性状的鉴定结果，在重庆市甘薯新品种区域试验中，“渝薯２０”３年平均鲜薯产量为２７．０７ｔ／ｈｍ￣２，薯干产量为７．４３ｔ／ｈｍ￣２，藤叶产量为２５．１７ｔ／ｈｍ￣２。其中，鲜薯产量比对照品种“徐薯１８”增产１１．６７％；薯干和藤叶产量比其减产２．８８％和２３．１５％。该品种薯块烘干率２７．４７％，含淀粉１８．７％、Ｖｃ１９．６ｍｇ／１００ｇ、β－胡萝卜素４６９．６μｇ／１００ｇ；以干基计，含粗蛋白３．８％、氨基酸３．３％、可溶性糖１２．４％。“渝薯２０”萌芽性、耐贮性好，结薯较早，净同化率高，抗旱性、早收性、抗黑斑病性较好，１９９３年已推广４０００ｈｍ￣２以上。

The paper gives an intreduction of the productivity and essential econonucal characters of a new-ly-evolved sweet potato variety named'Yushu 'used for food and food processing.In the regional test in Chongqing from 1986 to l988,the average fresh tuberous root weight of 'Yushu 20' is 27. 07t/hm￣2 which increased 11.67%comparing with the'Xushu 18',But its mean dry matter and freshvine are 7.43t/hm￣2 and 25.17t/hm￣2 which decrcase 2.88%and 23.15%than those of the'Xushu18',respectively,According to the analysis,the content of dry matter is 27.47%and starch 18.7%,vitamin c 19. 6 mg/100g,β-carotene 469.6 μg/100g in the fresh tuberous root of'Yushu 20'and the content of protein is 3.8%,amino acid 3.3%and soluble sugar 12.4%in the dry tubertous root.The 'Yushu 20'has good bud bursting and easy storing proporties,and the rate of high net assimilationand early-tuberous-growing as well as with highly drought resistance and blacken root resistance.Theplanting area of 'Yushu 20'has been popularized over 4 000 hm￣2 in 1993.