玉米雄穗耐热性的遗传特点及其与产量性状的相关性研究

Genetic Analysis of the Tassel Heat Tolerance and the Correlation with Yield Traits on Maize

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。

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 fr...