中文摘要：

于2005年采用主基因＋多基因混合遗传模型,对高丹草（Sorghum×Sudan grass）2002 GZ-1和2002 GB-1杂交组合的5个世代（P1、P2、F1、F2、F2∶3）群体的株高和叶片数进行联合分析。结果表明：株高遗传受2对加性-显性主基因＋加性-显性多基因（E-2）控制;叶片数遗传受2对加性-显性-上位性主基因＋加性-显性多基因（E-1）控制,两性状的遗传符合2对主基因＋多基因混合遗传模型,主基因对株高、叶片数的表现起主要作用。株高中主基因加性和显性效应分别为26.98、10.02和2.36、1.61,而多基因分别为-6.95和-5.06,F2和F2∶3的主基因遗传率分别为77.94%和82.95%。叶片数主基因的加性和显性效应分别为6.11、1.04和0.63、-0.09,多基因分别为-0.16、-0.11,F2和F2∶3的主基因遗传率分别为89.30%和91.60%。表明2个性状是以主基因遗传为主,应在早期世代进行选择。该性状所属遗传模型的研究,旨在为高丹草的遗传改良和杂种优势利用提供理论依据。

英文摘要：

The main gene ＋ polygene mixed model was used in genetic analysis of height and leaf number of 5 plant materials（P1,P2,F1,F2,F2∶3） of Sorghum×Sudan grasses（2002GZ-1 and 2002GB-1） in 2005.The results showed the plant height character related to 2 pairs of additive-dominant main gene＋additive-dominant polygene（E-2）.The leaf number character related to 2 pairs of additive-dominant-epistatic main gene＋additive-dominant polygene（E-1）.The 2 characters genetics subjected to the main gene ＋ polygene mixed model,and the main genes decided the height and the leaf number expression.The contribution of 2 main genes in height effect on addition and domination were 26.98,10.02 and 2.36,1.61 correspondingly,while that of polygene were-6.95 and-5.06.The heritability of main gene in F2 and F2∶3 were 77.94% and 82.95%.The contribution of 2 main genes in leaf number effect on addition and domination were 6.11,1.04 and 0.63,-0.09 correspondingly,while that of polygene were-0.16,-0.11.The heritability of main gene in F2 and F2∶3 were 89.30% and 91.60%.It showed that the 2 characters were mainly controlled by main gene.The related selection should be carried in early progenies.The result of the agronomic character genetic model provided the guide for Sorghum×Sudan grass improvement and heterosis prediction.