Abstract:

The relationship between AFLP molecular marker and hybrid yield/yield heterosis was analyzed in maize (Zea mays L.). The materials consisted of 17 inbred lines and their 136 single cross hybrids in a diallel crossing design. The results indicated that the genetic distance (GD) based on AFLP data was significantly correlated with hybrid yield/yield heterosis, the correlation coefficient being 0.4503, 0.3714, respectively in 1997, and 0.4352, 0.3253, respectively in 1998, but the determination coefficient (r2) was low. The correlation between GD and hybrid yield/yield heterosis was different when parent materials tested were changed. In particular, if parent materials were unrelated lines, GD was not correlated with hybrid yield/yield heterosis. The results suggest that AFLPs with high polymorphism can be used to investigate the relationships among maize inbreds, although they are of limited value for predicting the hybrid yield and yield heterosis of maize.

AFLP 标记与玉米杂种产量、产量杂种优势的预测
吴敏生*  戴景瑞
（中国农业大学遗传育种系，北京100094）

摘要：以 17个玉米 (Zeamays L .)自交系及其按双列杂交配制的 136个单交种为材料 ,研究AFLP分子标记与玉米杂交种产量、产量杂种优势的关系。结果发现 ,基于AFLP数据计算的遗传距离与 1997年杂种产量、产量杂种优势的相关系数 (r)分别为 0 .45 0 3、0 .3714,与 1998年杂种产量、产量杂种优势的相关系数分别为 0 .435 2、0 .32 5 3,均达到显著水平 ,但决定系数 (r2 )都很小。当亲本材料改变时 ,它们的相关性也随着改变 ,尤其是当亲本自交系亲缘关系较远时 ,二者完全不相关。表明尽管AFLP技术有较高的多态性 ,但用于预测玉米的杂种产量和产量杂种优势的作用也是有限的。

关键词： 玉米；AFLP标记；遗传距离；杂种优势；产量

Key words: maize, AFLP, genetic distance, heterosis, yield