【摘要】 【目的】明确苦荞株型的遗传机制为苦荞高产新品种培育提供参考。【方法】利用株高差异较大的两个苦荞品种的杂交后代开展了株型相关性状以及产量的遗传规律及其性状间的相关性分析。【结果】株高、分枝数、主茎节数和单株粒质量在F₂群体和F₃群体中都出现超亲分离,并且除了分枝数以外,株高、主茎节数和单株粒质量的显性方差大于加性方差,平均显性度大于1。4个性状在F₂代和F₃代中的广义遗传率为0.62～0.78,在狭义遗传率中单株粒质量为0.26和0.31为最小,分枝数为0.65和0.68最大,株高和主茎节数在其之间。株型性状以及产量间的相关分析发现,株型性状都与产量性状存在显著的表现型正相关,株高与产量性状间的遗传相关系数较大。【结论】遗传率较高的分枝数可以在早期世代进行选择,与产量密切相关的株高可以后期世代进行选择。更多还原

【Abstract】 [Objective]This study aimed to provide a theoretical reference for clarifying the genetic mechanism of plant type of tartary buckwheat and breeding new high-yield tartary buckwheat varieties.[Method]Hybrid offspring of two tartary buckwheat varieties with large differences in plant height were used to carry out the correlation analysis of plant type-related traits,the genetic parameter of yield and the correlation among traits.[Result]The results showed that the plant height,umber of branch,number of the main stalk sections and seed weight per plant were beyond separation in F₂ and F₃ populations,and in addition except for the number of branch,the dominant variance of plant height,number of the main stalk sections and seed weight per plant was greater than their additive variance,and the average dominant degree was greater than 1.4 traits in the F₂ and F₃ generations had the broad-sense heritability rates of 0.62-0.78,in the narrow-sense heritability,the seed weights per plant were 0.26 and 0.31,which were the smallest,the numbers of branches were 0.65 and 0.68 which were the largest,plant height and number of the main stalk sections were in between.Correlation analysis between plant type traits and yield found that there was a significant positive correlation between plant type traits and yield traits,and the genetic correlation coefficient between plant height and yield traits was large.[Conclusion]Therefore,the number of branches with higher heritability can be selected in the early generation,and the plant height closely related to yield can be selected in the later generation.更多还原