为了解决玉米复杂样品纯度中存在遗传不稳定及回交株等难以鉴定的问题，通过分析3 998份国家和省级审定玉米品种，结合快速提取、多重扩增体系等技术，构建一套适用于复杂样品纯度检测的复合检测方案。分析53份不同来源的郑单958纯度测试样品，结果表明，对于复杂样品使用单个位点进行纯度判定时，不同位点间结果会有较大差别，使用3个或3个以上位点综合判定时能够有效获得准确稳定的纯度检测结果。复合检测方案能够在时间和成本未大幅增加、仅增加少数引物的条件下获得多个SSR标记指纹，使复杂样品得到更加全面、精准解析，从而为种子生产中复杂样品的质量问题提供解决方案。

To address the issue of difficult purity identification in complex maize samples, including genetic instability and backcross plants, a comprehensive detection scheme for purity detection in complex samples was developed. This scheme was constructed by analyzing 3,998 national and provincial approved maize varieties, and incorporating techniques such as rapid extraction and multiple amplification systems. By analyzing 53 samples of maize hybrid Zhengdan958 from different sources, it was found that when using a single locus for purity determination, there were significant differences in results among different loci due to genetic instability. However, when three or more loci were used for comprehensive determination, accurate and stable purity detection results could be obtained. The comprehensive detection scheme allows for the generation of multiple SSR marker fingerprints with minimal increase in time and cost, using only a few additional primers. This enables a more comprehensive and accurate analysis of complex samples, providing solutions for quality issues in seed production involving complex samples.

S513.037