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龙白 3号大白菜为矮桩牛心型一代杂种。亲本P 2 0自交不亲和系由通化×胶二叶 60 Coγ辐射诱变群体中选出 ,亲本 2 36自交弱亲和系以龙白 1号大白菜为试材经连续自交育成。龙白 3号高抗病毒病 ,兼抗霜霉病 ,品质优良 ,净菜率高 ,产量为 4 2 2 3.5～ 5 2 0 0 .8kg·(6 6 7m2 ) -1,较对照品种增产 2 0 %左右。
Long white Chinese cabbage No. 3 is a low-yielding beef cattle heart generation hybrids. The parents P20 selfing incompatibility lines were selected from the mutagenized population of Tonghua × plastic two-leaf 60 Co γ radiation. The parental 2 36 selfing-weaning inbred lines were obtained by continuous selfing . Longbai 3 was highly resistant to virus disease and resistant to downy mildew, with good quality and high cleanliness rate. The yield was 4222.5 ~ 5200.8 kg · (667m2) -1, 20% more than the control %about.