Breeding of A Radish CMS in Chinese Cabbage(RC_7) and the Research of Its Traits

The new Chinese cabbage CMS(RC7) was bred by using Brassica napus CMS(RC97-1) which is introduced presently as sterile material source,conducting interspecific hybridization to transfer the RC97-1 sterility to Chinese cabbage,then continuing backcross breeding and strictly economic characters selection.The new Chinese cabbage CMS(RC7) has normal leaf color and nectary and perfect functional pistil to attract insects to pollination.It also has strong bearing ability.The sterile plant ratio and sterile degree of CMS(RC7) are both 100% while be planted in different ecological area and sowing condition.The RC7 bears naturally good,is high resistant to downy mildew and is resistant to virus disease and black spot,has high combining ability.The growing period of RC7 is 85 days with the plant height of 58.6 cm and the plant width of 45.3 cm.The leafy head of RC7 is cylindrical type with the 48.5 cm longitudinal diameter of the head,16.3 cm transverse diameter of the head,2.89 index of head shape,3.6 kg of the single head weight and high value of utility.The Chinese Cabbage F1,'Jinqiu 70' and 'Jinqiu 90',which are attuned to the demands of the market,were bred with RC7 as theirs female parent.They are characterized by high resistant to diseases,extensive adaptability,high quality,high and stable yield.