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在秋播或低温条件下陕2A类型不育材料比波里玛类型的微粉发生较多。微粉发生与气温关系密切,当开花前20天气温稳定在15℃以上时不育系基本上没有微粉发生。因此秋播油菜先开花的主花序、上部分枝以及每一个花序的中下部由于处于相对的低温条件开花,所以微粉发生较多。春播情况下不育系开花期延迟,开花期温度较高,可消除微粉。
Shaanxi 2A type sterile material occurred more frequently than the Borrema type of micropowder under autumn or low temperature conditions. The occurrence of micropowder is closely related to the temperature. When the temperature is stable above 15 ℃ for 20 days before flowering, there is basically no micropowder in the sterile line. Therefore, the main flowering rape autumn inflorescence, the upper branches and the lower part of each inflorescence flowering in relatively low temperature conditions, so the occurrence of more powder. Spring flowering sterile flowering period delay, flowering temperature is higher, can eliminate the powder.