8984×GY220 F_(2:3)家系植株性状的分离特征及相关分析

Segregation Characteristics and Their Correlation Analysis on Plant Characters of F_(2:3) Family Lines from A Normal Maize×High-Oil Maize Inbred Cross

[目的]研究由优良普通玉米自交系8984与高油玉米自交系GY220杂交构建的F2∶3家系的分离特征及其相关性。[方法]在夏播环境条件下对8个植株性状进行分析。[结果]F2∶3家系间各性状均存在极显著的差异,并呈连续性正态分布,存在明显的双向超亲分离;株高与穗位高、顶高、穗上叶片数、叶面积、雄穗长和雄穗分枝数,穗位高与顶高、穗上叶片数、叶面积、雄穗长和雄穗分枝数,顶高与顶高/株高、穗上叶片数、叶面积、雄穗长和雄穗分枝数,顶高/株高与穗上叶片数,穗上叶片数与叶面积、雄穗分枝数,叶面积与雄穗长间均呈显著或极显著的表型和遗传正相关;顶高/株高与株高、穗位高、叶面积和雄穗分枝数间均呈显著或极显著的表型和遗传负相关。[结论]该研究可以为高油玉米育种及其相关性状的分子遗传研究提供一定的科学依据。

[ Objective ] The purpose was to study the segregation characteristics of F2：3 family lines which were developed from the cross be- tween a normal maize inbred 8984 and a high-oil inbred GY220 cross and analyze their correlation. [ Method] Eight plant traits of F2：3 family lines were analyzed in summer sowing environment. [ Result ] The results showed that there were significant differences among F2：3 family lines for all plant traits. All traits showed normal distributions, with obvious segregations beyond the two parents. There were significant or highly significant positive correlations between plant height and ear height, top height, leaf number on ear, leaf area, length of tassel, tassel branch number, between top height and ratio of top height and plant height, leaf number above top ear, leaf area, length of tassel, tassel branch num- ber, between ratio of top height and plant height and leaf number on ear, between leaf number on ear and leaf area, tassel branch number, ear height, length of tassel. While ratio of top height and plant height was the significant or highly significantly negatively correlated with plant height, ear height, leaf area, tassel branches. [ Conclusion ] The study provides a scientific basis for high-oil breeding and molecular heredity studies.