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近年来,“京丰1号”、“报春”、“秋丰”、“黑叶小平头×金亩84”等优良甘蓝杂种一代已在部分省市大面积推广,增产显著,深受群众欢迎。但甘蓝杂种一代制种时常出现一些问题,如某些组合双亲花期不遇;某些亲本原种繁殖时常不能正常开花等,影响甘蓝杂种一代的推广。甘蓝杂种一代制种时双亲花期不遇,不仅会影响杂种种子产量,而且会因杂交率不高而影响杂交种子质量。“北京早熟”、“金亩84”等属开花晚类型,“金早生”、“黑叶小平头”等属开花早类型,因此,“北京早熟×金早生”即“报春”及“黑叶小平头×金亩84”两个组合制种
In recent years, “Jing Feng 1”, “Primrose”, “Autumn Feng”, “black leaves Xiaoping × Jinmu 84” and other elite cabbage hybrid generation has been large-scale promotion in some provinces and cities, yield significant, by the masses welcome. However, some problems often occur in the hybrid generation of cabbage hybrids, such as some combinations of flowering parents do not encounter; some parental breeding often can not flowering, affecting the promotion of cabbage hybrid generation. The flowering period of parents is not met when the hybrid cabbage is breed, not only affects the hybrid seed yield, but also affects the quality of the hybrid seed due to the low hybridization rate. Early maturing varieties such as “Beijing Precocious” and “Jinmu 84” belong to the late flowering type, and “Golden Early Life” and “Black Ye Xiaoping Tou” belong to early flowering types. Therefore, Ye Xiaoping head × Jinmu 84 "two combinations of seed