【摘要】 以运系05-8等8个玉米自交系为基础材料进行NCⅡ遗传设计,分析16个F1组合雄穗耐热性的遗传方差及其与产量性状的相关性,对相应5个世代的平均值进行遗传模型的尺度测验。结果表明:玉米雄穗耐热性的遗传以加性效应为主,显性效应不明显。F1雄穗耐热性平均中亲优势仅为2.13%,但变异幅度高达-20.00%～25.00%,说明高温敏感型自交系的使用可能会降低F1雄穗的耐热性。雄穗耐热性的遗传力为46.67%,而遗传方差仅为0.076 9,需要在大群体中进行早代表型选择;玉米雄穗耐热性与行粒数呈显著正相关,和开花吐丝间隔(ASI)呈显著负相关,说明行粒数多和开花抽丝间隔短的品种(系)具有较高的雄穗耐热性,可以作为雄穗耐热性的间接选择指标;大多数组合的B、C尺度模型测验不显著,表明雄穗耐热性的遗传基本符合加-显遗传模型。更多还原

【Abstract】 We planned NCⅡgenetic design(4×4) to analysis the genetic variance of heat tolerance trait of 16 F1 combinations,the correlation with yield traits and the genetic model scaling test with the average value of five genera-tions from the 8 parent lines.The results showed that in the maize heat tolerance genetic effect,the additive effect was predominated while the dominant effect was unremarkable.The average mid-parental hybridization of F1 heat toler-ance was only 2.13%,but the changing range was very wide from-20% to 25.00%.It indicated that using sensitive heat tolerance inbred lines would decrease F1 the heat tolerance.The highly heritability and lowly genetic variance suggested that the early generation test was proper,but a larger basic population was needed.The correlation among heat tolerance,grain number per row and ASI were r=0.621 3* and r=-0.536 5*.These results showed that the vari-ety,which had more grain number per row and shorter ASI,would have higher heat tolerance.Furthermore,they were indirect parameters as heat tolerance materials selection.The B,C scaling test of most combinations was indistinctive.It suggested the heredity of heat tolerance were appropriate to additive-dominant model.更多还原