玉米GY220×1145组合RIL群体粗缩病抗性性状的遗传分析

Genetic analysis on resistance trait of maize rough dwarf disease by using RILs of GY220/1145 combination in maize(Zea mays L.)

调查玉米GY220×1145组合的RIL群体109个家系(F10;11)及其亲本在2个环境下粗缩病抗性的表型值,运用RIL群体的主基因多基因模型进行遗传分析,探讨玉米粗缩病抗性遗传规律。结果表明:①2008年GY220/1145组合的RILs粗缩病抗性性状的最佳遗传模型为E-1-5模型,即2对加性-显性-上位性主基因+加性-显性-上位性多基因混合遗传;2009年最佳遗传模型为G-0模型,即3对加性-上位性主基因+加性-上位性多基因模型混合遗传。②各主基因效应值不同。③上位性总效应小于主基因总效应。④有单个上位性效应大于单个主基因效应的情形出现。⑤主基因遗传为主,多基因遗传为辅。

Developing and cultivating resistant hybrids is an effective approach to control maize rough dwarf disease （MRDD）. Genetic analysis was carried out for traits of resistance to MRDD, by using a RIL population （109 lines） de- rived from a single cross hybrid of GY220/1145, using mixed major gene plus polygene inheritance models and joint seg- regation analytical method of RILs population. Main research results showed as follows： O In 2008, resistance trait of maize rough dwarf disease was controlled by two pairs additive-dominance-epistasis major-gene and additive-dominance~ epistasis polygenes, and was mainly governed by major-genes~ whereas in 2009, the trait was controlled by three pairs ad- ditive-epistasis major-genes and additive-epistasis polygenes, and was mainly governed by major genes. （2） Various major- gene have different effect value. （3） Total effect value of epistasis was less than the value of major-genes. （4） Sometime effect value of certain epistasis might be greater than that of certain major-gene.