浙江省农业科学院作物研究所利用现有颜色通过杂交、回交、辐射诱变 ,结合生物技术等方法 ,筛选出灰色特变株 ,经几年田间试验种植 ,选育成灰色新品系。该品系为灰色 ,色泽稳定 ,颜色较深且不褪色 ,从播种到吐絮全生育期为 1 2 5～ 1 3 5天 ,1 0月 2 0日前收花量为 88.6 % ,霜 Institute of Crop Sciences, Zhejiang Academy of Agricultural Sciences using existing colors through hybridization, backcrossing, radiation mutagenesis, combined with biotechnology and other methods, screening of gray mutant strains, after several years of field trials planting, breeding into new gray lines. The strain is gray, stable in color, deep in color and non-fading. The whole growth period from sowing to bolting is 125 to 135 days, and the amount of flowers received is 88.6% before January 20,