玉米姊妹交及改良单交种的性状表现及应用分析

Character Manifestation of Corn Sister Cross and Modified Single Cross and Utilization Aanalysis

通过对６个基础材料的姊妹交及改良单交种的产量及主要性状的统计分析表明：姊妹交较其对应的姊妹系有明显的优势，其中以产量增加最显著，一些主要性状的差异也达到了显著水平，且较好地保持了原姊妹系的配合力效应，改良单交种与原单交种产量及其它性状差异不显著；不同材料、不同世代及相同材料的姊妹系间的优势指数差异较大。在实际应用中，应视具体材料进一步试验，选出最优的姊妹交改良玉米单交种，以获得最佳的经济效益。

The main character manifestation of sister cross and modified single cross hare been studied among 6 base marterials. The results showed that sister cross had clear superiority to the sister lines. Its yield increased markedly and combining ability of its sister lines was held better. Defference in the yield and main characters between the modified single cross and original one was not marked. The difference of the dominant index in different marterials or generations or among sister crosses in the same generation was different. So the experiment in real application must be repeatedly made, so that the best sister cross can be selected and the best economic benefit can be achieved.