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本研究利用玉米姊妹交技术，克服自交衰退．提高种子生产效益。用以研究的5个毕单系列玉米杂交种，通过用姊妹种配制出了相应的改良单交种．显著提高了杂交种制产量，且改良单交的F1杂种优势不下降，生产力与原单交F1持平或略增。
In this study, sister-sister technology of maize was used to overcome the self-fertility decline. Improve seed production efficiency. Five complete series of maize hybrids for research were developed by breeding the corresponding improved monocotyledonous species with sister species. Significantly increased the yield of hybrids, F1 hybrid heterosis improved single cross does not decline, productivity and original single cross F1 flat or slightly increased.