玉米几个主要农艺性状的遗传研究

采用增广NCⅡ设计,研究玉米的株高、穗位高、穗长、穗粗、穗行数、粒长、百粒重和小区产量的遗传。结果表明,穗位高和百粒重符合加性-显性遗传模型,株高和穗行数除加性-显性效应外还有上位性效应,粒长和小区产量除加性效应外还有上位性效应,穗粗和穗长只有加性效应。显性性质:株高和穗位高平均为部分显性,百粒重和穗行数平均为超显性,显性方向株高、穗位高、百粒重和穗行数均为双向显性。

Genetic Studies on Main Agronomic Characters of Maize

The genetic model of maize including the plant height, ear diameter, ear length, ear placement, row number, grain length, 100 grain weight and plot yield was studied using augmented NC Ⅱ design. The results show that the ear placement and 100 grain weight were inherited in accordance with additive-dominance effect. The plant height and row number were inherited in accordance with additive-dominance-epistatic effect. The grain length and plot yield were inherited in accordance with additive-epistatic effect. The ear diameter and length were inherited in accordance with additive effect. As to the character of dominance, the plant height and ear placement were part-dominance, the 100 grain weight and row number were over-dominance. These characters were both positive and negative in the direction of average dominance.