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对 60～ 90年代初我国自育和引进的39个骨干自交系株形和产量性状遗传改良效应的研究表明 ,随着年代的推移 ,自交系的穗位高、穗位高 /株高比值明显降低 ,茎粗逐渐增加 ,株形更趋紧凑 ,雄穗分枝数和雄穗长度逐渐减少 ,改良效果显著。在产量性状中穗粗和穗行数的改良效果显著 ,单株粒重有所增加 ,但改良效果不明显 ,其它产量性状改良效果甚微。
Studies on the genetic improvement effects of plant shape and yield traits on 39 backbone inbred lines introduced in China from 60 to the early 90s showed that the ear height, ear height / plant height The ratio was significantly reduced, the stem diameter gradually increased, the plant shape more compact, tassel branch number and tassel length gradually reduced, the improvement effect is significant. In the yield traits, the effect of improving the ear diameter and the number of ear rows was significant, and the grain weight per plant increased but the improvement effect was not obvious. The improvement of other yield traits was negligible.