杂交玉米品种DUS必测性状的表现与优化

Performance and Optimization of Asterisked Characteristics in DUS Testing for Maize Hybrids

【目的】为优化玉米DUS必测性状和指南修改提供参考。【方法】以45个杂交玉米品种为材料,对38个普通玉米的必测性状进行测试,分析形态性状多样性和性状间的相关性。【结果】38个必测性状在45个杂交玉米品种中共检测到178个等位变异,平均每个性状检测到4.6842个,变幅为1~8;平均有效等位变异为2.7830,变幅为1.0539~5.9121;平均Shannon-Weaver多样性信息指数为1.2593,变幅为0.4236~1.9982。45个杂交玉米品种形态相似系数为0.31~0.68,38个性状中有9对性状间呈极显著正相关。【结论】建议不必把C3、C4、C13、C17、C19、C26、C27、C30这8个性状列为必测性状,保留其余30个性状作为必测性状。

【Objective】To optimize asterisked characteristics and provide references for maize DUS testing guidelines revision.【Method】All of 45 maize hybrids were tested to analyze the diversity and correlations of 38 asterisked characteristics in this study.【Result】One hundred and seventy-eight allelic variations were detected in 38 asterisked characteristics with an average of 4.6842 for each characteristics,and the variation range was from 1 to 8;the average effective allelic variation was 2.7830 with variation range from 1.0539 to 5.9121;the average Shannon-Weaver diversity information index was 1.2593,and the variation range was from 0.4236 to 1.9982.Similarity coefficient ranged was from 0.31 to 0.68 for 45 maize hybrids,and the 9 pairs characteristics showed significant positive correlations in 38 asterisked characteristics.【Conclusion】It was suggested that 8 characteristics that C3,C4,C13,C17,C19,C26,C27,C30 need not be examined as asterisked characteristics,and the other 30 characteristics should always be examined in maize DUS testing guidelines.