Abstract: Early generation stability of 8415, a japonica rice variety, was retested by using allelic differences of two qualitative traits. Results showed that both glume tip color and waxy endosperm segregated in progenies of single F1 plants derived from two crosses of 8415/Zi 18 (purple color) and 8415/Dahuaxiangnuo(waxy). The results denied the conclusion obtained in previous studies that 8415 had a characteristic of early generation stability. Meanwhile, it was found that using coefficient of variation as an indicator of early generation stability was unreasonable by analyzing plant height as an example. Importance of avoiding systematic error in research works was also discussed.

Key words: japonica rice variety, glume tip color, waxy endosperm, genetic testing, early generation stability, systematic error

摘要： 应用两个质量性状的等位基因差异，重新测验了粳稻品种8415的早世代稳定特性。结果表明，与84-15杂交的两个组合的F1单株后代，无论是稃尖色，还是籽粒糯性均发生分离，否定了84-15具有早世代稳定性的结论。同时以株高性状为例，分析了变异系数作为数量性状早世代稳定指标的不合理性。还讨论了试验研究工作应避免系统误差的重要性。

关键词: 粳稻品种, 稃尖色, 胚乳糯性, 遗传测验, 早世代稳定特性, 系统误差