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应用植物数量性状主基因+多基因混合遗传模型多世代联合分析方法,以玉米缺钾症状叶片数为指标,对1个耐低钾玉米自交系T和2个低钾敏感玉米自交系S1和S2配制成的2个组合的P1、P2、F1、B1、B2和F2世代进行遗传分析,研究明确玉米耐低钾性状的遗传机制。结果表明,玉米低钾耐性遗传在2个组合中都由1对加性+加性-显性多基因控制;主基因遗传率(F2)平均为60.43%,多基因遗传率(F2)平均为15.35%;T×S1组合的遗传变异占表型变异值为80.20%,T×S2组合的遗传变异占表型变异值为71.35%,表明耐低钾性状以主基因遗传为主。育种应用上可以在低世代进行这一目标性状的选择。
A multi-generational combined analysis method was used to study the relationship between the quantitative trait loci and the quantitative trait loci in wheat with 1 potassium deficient maize inbred line T and 2 low potassium sensitive maize inbred lines S1 And S2 were used for genetic analysis in two combinations of P1, P2, F1, B1, B2 and F2 to study the genetic mechanism of low potassium tolerant traits in maize. The results showed that inheritance of low potassium tolerance in maize was controlled by one pair of additive + additive-dominance polygenes in both combinations. The average of major gene heritability (F2) was 60.43%. The average of multiple gene heritability (F2) was 15.35%. The genetic variation of T × S1 accounted for 80.20% of the total, and the genetic variation of T × S2 accounted for 71.35% of the total, indicating that the low-K tolerant trait was dominated by the major gene. Breeding applications can be the next generation to carry out the target trait selection.