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采用完全双列杂交Griffing方法Ⅰ,分析了不同双亲耐旱性组合类型对后代耐旱性的影响及其亲本间耐旱性的一般配合力、特殊配合力和反交效应,同时对耐旱性主要遗传参数进行了分析。结果表明,玉米耐旱性的GCA效应存在显著差异,SCA效应存在极显著差异,R效应的差异不显著,6个亲本之间的耐旱性存在明显的差异,其中郑58耐旱性最强,PH4CV最差。用郑58、吉853、新自8717做耐旱亲本改良对后代耐旱性提高具有增益优势。基因的加性效应对后代耐旱性的提高因亲本和组合而异。因此,耐旱性遗传基因的表达,仅仅取决于加性效应和非加性效应,而与反交效应关系较小,玉米耐旱性的选择宜在高代进行。
The complete diallel cross Griffing method Ⅰ was used to analyze the effects of drought tolerance combinations on the drought tolerance of offspring and their general combining ability, special combining ability and anti-cross effect. Meanwhile, the effects of drought tolerance The main genetic parameters were analyzed. The results showed that there was significant difference in the GCA effect of drought tolerance of maize, SCA effect had significant difference, R effect was not significant difference, there was significant difference in drought tolerance among 6 parents, , PH4CV the worst. Zheng 58, Ji 853, 8717 from the new drought-resistant parents to improve the offspring to improve drought tolerance has a gain advantage. Additive effects of genes on drought tolerance in future generations increased due to the parents and combinations vary. Therefore, the expression of drought-tolerance genes depends only on additive and non-additive effects, but less on the cross-cross effect. The selection of drought tolerance in maize should be carried out in high generation.