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Evaluation of genetic variation and indirect selection criteria for improvement of oil yield in canola cultivars (Brassica napus L.)

机译:遗传变异和间接选择标准改善油菜籽油产量(Brassica Napus L.)的评价

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A randomized complete block design with three replications was conducted in order to evaluate the genetic variation and determination of the best indirect selection criteria for genetic improvement of oil yield in canola cultivars. Correlation analysis for oil yield showed positive and significant relationship among this trait with all the traits except days to flowering initiation, flowering duration and no.pod/plant. Step-wise regression of oil yield as dependent variable and the other traits as independent variables revealed that 99.1% of total variation exists in oil yield accounted for by the traits seed yield, oil percent, plant height and days to physiological maturity. Path analysis for oil yield designed high efficiency of the traits plant height and days to physiological maturity as indirect selection criteria for genetic improvement of this trait in canola cultivars especially in early generations of breeding programs. For seed yield and oil percent, positive indirect effects of these traits on oil yield via the traits plant height and days to physiological maturity must be considered. Cluster analysis revealed considerable genetic variation and efficacy of selection among canola cultivars as well as progenies to be obtained from crosses between them to improve oil yield.
机译:进行了三种复制的随机完整块设计,以评估遗传变异和确定油菜栽培品种油产量遗传改善的最佳间接选择标准。除了日期除以开花开始,开花持续时间和编号/植物,所有特征的油产量相关分析显示出这种特质的阳性和显着关系。作为依赖变量的逐步回归油产量和作为独立变量的其他特征显示,通过对种子产量,油百分比,生理成熟度的特性种子产量,油百分比,天数存在99.1%的总变异。石油产量的路径分析设计了植物高度和生理成熟日的高效率,作为油菜品种遗传改善这种特征的间接选择标准,特别是在早期的育种计划中。对于种子产量和油百分比,必须考虑通过特质植物高度和生理成熟日对油产量的正间间接影响。聚类分析揭示了加水溶胶品种中选择的相当大的遗传变异和选择的疗效,以及从它们之间的交叉获得的后代以提高油产量。

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