玉米DH系15D969超多穗行数的遗传分析

以超多穗行数DH系15D969和低穗行数自交系PH6WC、X901m组建的2个6世代群体（P₁、P₂、F₁、B₁、B₂和F₂）为材料,运用主-多基因混合模型遗传分析方法对穗行数进行遗传分析。结果表明：材料Ⅰ的F₁穗行数平均优势为-1.11%,为2对主基因加、显、上+多基因加、显混合模型,主基因遗传率为12.22%~96.37%,多基因遗传率为0~61.16%;材料Ⅱ的F₁穗行数平均优势为1.16%,为2对主基因加+多基因加、显混合模型,主基因遗传率为6.48%~54.18%,多基因遗传率为4.77%~67.23%。说明,穗行数由主基因和多基因共同主导,DH系15D969的超多穗行数由不完全显性多基因控制。

Genetic Analysis of Super Multiple Ear Row Number in DH Line 15D969 of Maize

Two six-generation population of P₁, P₂, F₁, B₁, B₂ and F₂ were established using super multiple ear row number DH line 15D969 and low ear row number inbred lines of PH6WC and X901m were used as materials to analyze the inheritance of ear row number with major gene-polygene mixed inheritance model. The results showed that the average heterosis of F₁ was -1.11%, which was a mixture model of two major genes additive-dominance-epitasis plus polygene additive-dominance. The heritability of major genes was 12.22%-96.37%, and the heritability of polygene was 0-61.16% in material I. The average heterosis of F₁ was 1.16%, which was a mixture model of two major genes additive plus polygene additive-dominance. The heritability of major genes was 6.48%-54.18%, and the heritability of polygene was 4.77%-67.23% in material II. It was concluded that the ear row number was dominated by both major genes and polygene, and the super multiple ear row number in DH line 15D969 was controlled by incomplete dominant polygenes.