桑树新品种7681是四川省农科院蚕桑研究所选育的,其母本是苍溪49号,父本是育2号。 7681桑经3年6季养蚕、缫丝、制种试验和叶质生化分析,4年8季氨基酸含量测定,12年生物学特征特性观察和5年区域性栽培鉴定,其性状稳定。1988年获四川省科学技术进步三等奖,1989年获国家发明四等奖。特征特性冬芽饱满、盾状、赤褐色,芽小。枝条直立,姿态开展,皮褐色。成叶椭圆形,叶色深 The new mulberry variety 7681 was bred at the Sericulture Research Institute of Sichuan Academy of Agricultural Sciences. Its mother was Cangxi No. 49 and its male parent was No. 2. 7681 Three years and 6 seasons of mulberry silkworm, reeling, seed production test and leaf biochemical analysis, 4 years and 8 seasons amino acid content determination, 12 years of biological characteristics and 5 years of regional culture identification, its character is stable. In 1988 won the third prize of progress of science and technology in Sichuan Province, in 1989 won the fourth prize of national invention. Features winter bud full, shield-shaped, brown, small buds. Branches erect, attitude, brown skin. Leaves into oval, dark leaves