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本文根据橡胶有性系的若干性状,进行有关遗传参数的分析,并试图通过表型的表现,据以识别其基因型,期能进一步提高选择效果,为遗传动态的研究提供依据。根据我院实验场1967年定植的有性系8个组合的生长及产量资料(1978—1979年)的变量分析,结果表明各性状平均遗传力的大小依次为:原生皮厚(0.82)→再生皮厚(0.77)→干胶含量(0.73)→茎围(0.69)→叶柄胶(0.63)→干胶产量(0.42)→相对产量(0.40)→累积系数(0.36)→堵塞指数(0.27)→叶柄乳管(0.11)。其中以前三项指标为较稳定,受环境的影响较小。在遗传相关分析中,可发现干胶含量及相对产量两性状与干胶产量的相关为最密切,而堵塞指数与产量的相关恰相反,说明胶乳的堵塞会导致产量的下降。遗传相关高的性状虽可供作间接选择上参考,但以选择与产量关系既密切而遗传力又较高的性状为较理想,如本试验的干胶含量。事实证明:采用几个与产量有关的因素共同组成选择指数时,经比较发现,只要指数中的性状配合适当,其相对效率所获遗传进度将有不同程度的提高。对有关遗传参数所得的估值,常因不同材料,不同年份及不同环境条件而有不同的变化,在此本文只提供初步分析方法,至于进一步结果,有待今后的工作。
Based on some traits of rubber sexual line, this paper analyzes the genetic parameters and attempts to identify its genotype through phenotypic performance, which can further improve the selection effect and provide the basis for the study of genetic dynamics. According to the analysis of the variables of the growth and yield data (1978-1979) of eight combinations of sexual lines colonized by the experimental field in our hospital in 1967, the average hereditary power of each trait was as follows: primary skin thickness (0.82) → regeneration (0.77) → dry glue content (0.73) → stem circumference (0.69) → petiole glue (0.63) → dry glue yield (0.42) → relative yield (0.40) → cumulative coefficient (0.36) → plugging index Petiole breast tube (0.11). The previous three indicators are more stable and less affected by the environment. In the genetic correlation analysis, it can be found that the correlation between the dry matter content and the relative yield and the dry matter yield are the most close, but the correlation between the clogging index and the yield is the opposite, indicating that the blockage of the latex will lead to the decrease of the yield. Although genetically-related traits are available for indirect selection, it is more desirable to choose traits which are closely related to yield and higher heritability, such as the dry weight of the test. Facts have proved that using several output-related factors together to form a selection index, the comparison found that as long as the traits in the index fit properly, the relative efficiency of the genetic progress obtained will have varying degrees of improvement. The valuation of the genetic parameters often varies with different materials, different years and different environmental conditions. In this article, only the preliminary analysis method is provided. As for the further results, the future work needs to be done.