利用自交不亲和系配制大白菜和甘监杂种一代种子,主要问题是繁殖自交不亲和系需进行蕾期授粉比较费工、增加了杂种一代的制种成本。国外是利用花期株间授粉后维持高二氧化碳浓度若干小时,来繁殖自交不亲和系。但此方法对温室或大棚的密封度要求高,又涉及二氧化碳施用时间和浓度 The use of self-incompatible lines to prepare Chinese cabbage and Ganshen hybrid seed, the main problem is the need for self-incompatibility inbred lines need more pollination bud stage, an increase of hybrid seed production costs. Abroad is the use of inter-period pollination to maintain high carbon dioxide concentration for several hours to breed self-incompatible lines. However, this method of greenhouse or greenhouse sealing requirements are high, but also relates to the carbon dioxide application time and concentration