大白菜萝卜细胞质雄性不育系RC7的选育及其特性研究

利用甘蓝型油菜萝卜细胞质雄性不育材料RC97-1为不育源,采用种间杂交,将RC97-1的不育性导入大白菜,再通过连续回交转育和严格经济性状选择育成新的大白菜胞质雄性不育系RC7.RC7表现为:蜜腺正常,雌蕊功能健全,能吸引蜜蜂等昆虫正常采蜜传粉;在不同的生态区和播期条件下不育性稳定,不育株率和不育度均达100%,且自然结实性良好,配合力高;高抗霜霉病,抗病毒病和黑斑病;生长整齐,叶色正常,生育期85 d,株高58.6 cm,株幅45.3 cm,叶球纵径和横径分别为48.5和16.3 cm,球形指数2.98,单球质量3.6 kg左右.RC7的一代杂种金秋70和金秋90抗病性强,适应性广,优质、丰产、稳产.因此,RC7是优良的大白菜萝卜细胞质雄性不育系,具有较高的利用价值.

Breeding of A Radish CMS in Chinese Cabbage (RC7) 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.