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搜集和整理了我国“六五”以来，１５ａ 间国内育成的６３ 个单、双低优势油菜新品种主要细胞质来源和遗传背景，并针对选育过程中存在的一些问题进行了探讨分析。这对于防止因遗传背景狭窄，细胞质过分单一而可能造成的产量、抗性水平降低等问题，有一定的借鉴和指导意义。
The main cytoplasmic origin and genetic background of 63 single and double low rapeseed cultivars newly bred in China since the “6th Five-year Plan” have been collected and sorted out. Some problems existing in breeding process have also been discussed and analyzed. This is of some reference and guidance for preventing such problems as the narrow genetic background, excessively single cytoplasm and the potential yield and resistance.