LYU Sirui，ZHANG Deshuang，LI Peirong，XIN Xiaoyun，ZHANG Fenglan，YU Shuancang，YU Yangjun，ZHANG Yaowei，ZHAO Xiuyun，WANG Weihong，SU Tongbing，LU Guixiang
China Vegetables. 2022, 1(4): 13-20.
Taking milky white flowers‘Guanghaichaoji 80 tian’and orange flowers‘14A-P2-21’as materials，this experiment constructed P1，P2，F1，F2，BC1 and BC1′6 generation groups；studied the dominant relationship and heredity laws of milky white flowers and orange flowers of flowering Chinese cabbage〔Brassica campestris L. ssp. chinensis（L.）var. utilis Tsen et Lee〕；measured and analyzed the components and contents of carotenoid，flavone in petals of 3 kinds flowers namely yellow，milky white and orange．The results showed that yellow flower was manifested as dominant to milk white flower and orange flower．There was no obvious recessive relationship between milky white flowers and orange flowers．There were 2 pairs of recessive，independent non-allelic genes controlling the heredity of flower color．The pollen viability and pollen germination rate of orange flowers was significantly lower than that of yellow and milky white flowers．The plants of orange flower were weak with late flowering phase under the same cultivation environment．There were 4 kinds colors in flower from F2 population：yellow，milky white，orange and light orange．The separation ratio of orange flower was lower than theoretical value．It is speculated that the reason might be gametophyte activity of orange flower was weaker than that of yellow flowers and milky white flowers．Its competitiveness was lower under the same conditions．The survival rate of orange flower plants was also lower，leading to the decrease in plant number of orange flowers．The contents of total carotenoid and total flavone in petals of orange flower were significantly higher than those in milky white and yellow flowers．Flowering Chinese cabbage with orange flower might be a new direction for breeding flowering Chinese cabbage variety．
