Abstract: Qingyan No.1 is a extreme early F 1 hybrid developed by crossing two Chinese Cabbage self incompatible 89 3 line from Yubao and 253 2 line from Hei Longjiang No.5. It can be harvested in 45～50 days after sowing. It is resistant to TuMV and Downy mildew and Soft rot with strong heat tolerance. Its yield was 48t·hm -2 . The near ellipse heads with less hair are light green with high quality and high marketable pecentage. It has been grown in Shangdong,jiangsu,Zhejiang,Anhui,Henan,Hubei,Fujian etc.

摘要： 青研１号系以玉宝白菜８９３和黑龙江５号白菜２５３２两个自交不亲和系配制而成的夏播大白菜一代杂种。生长期４５～５０ｄ（天），耐热性强，抗病毒病、霜霉病和软腐病。平均每６６７ｍ２产净菜３１１０～３３４６ｋｇ。叶球近椭圆形，淡绿色，刺毛稀少，品质优良，商品性好。该品种已在山东、江苏、浙江、安徽、河南、湖北、福建等地推广种植。

关键词: 大白菜, 青研1号, 一代杂种, 耐热, 极早熟