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Improving Grain Yield and Yield Components of Temperate Maize Using Tropical Germplasm

机译:利用热带种质改良温带玉米的籽粒产量和构成因素

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The objectives of this study were: (1) to determine general combining ability (GCA) of 25 inbred lines selected from CIMMYT populations, specific combining ability (SCA), heterotic specific-group combining ability (HSPGCA) of testcrosses from these 25 lines, using four testers; (2) to determine optimum number of testers for evaluating a large number of exotic lines. The 25 exotic lines were crossed with four elite local maize inbred lines (a line x tester design). A randomized complete-block design with three replications was used at two locations. Data on grain yield and five yield-component traits were recorded. Combining ability analysis showed 8 exotic lines to be genetically similar to the testers and could be assigned to the two current maize heterotic groups. Correlation analysis indicated that one tester had correctly selected the top best lines from a large number of exotic lines. However, when line x location interaction is significant, exotic line performance should he evaluated at multiple locations or multiple years or both.
机译:这项研究的目的是:(1)确定从CIMMYT种群中选择的25个自交系的一般结合能力(GCA),这25个系的交配的特异性结合能力(SCA),杂种优势群结合能力(HSPGCA),使用四名测试员; (2)确定用于评估大量奇异线条的最佳测试人员数量。将这25条外来品系与4条当地的玉米优良自交系杂交(一系x测试仪设计)。在两个位置使用了具有三个重复的随机完整块设计。记录了谷物产量和五个产量构成特征的数据。结合能力分析表明,8个外来品系在遗传上与测试者相似,可以分配给两个当前的玉米杂种群体。相关性分析表明,一名测试人员已从大量奇特的品系中正确选择了最佳的品系。但是,当x线位置互动很重要时,他应该在多个位置或多个年份(或两者兼而有之)评估异国线的性能。

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