蒙古冰草和冰草的杂交F_1代群体农艺性状的相关、通径及聚类分析  

Correlation,path,and cluster analysis of agronomic characteristics of the F_1 population from the cross between Agropyron mongolicum and diploid Agropyron cristatum

作　　者：段清清[1] 徐荣蕊 李旭青[1] 车永和[1] 张锦鹏[2] 李秀全[2] 杨欣明[2] 刘伟华[2] 

机构地区：[1]河北科技师范学院生命科技学院,河北秦皇岛066600 [2]中国农业科学院作物科学研究所,北京100081

出　　处：《草业科学》2017年第1期94-100,共7页Pratacultural Science

基　　金：国家自然基金项目(31471493)

摘　　要：通过探究冰草属(Agropyron)植物的主要农艺性状间的关系,选育出优良冰草(A.cristatum)种质资源为提高小麦(Triticum aestivum)远缘杂交育种效率提供理论依据。本研究以蒙古冰草(A.mongolicum)(母本)和二倍体冰草(父本)进行杂交获得的F_1代群体为材料,对该群体116个单株的9个主要农艺性状进行了调查分析。结果表明,116个单株在所有农艺性状上均表现出明显的遗传变异(11.2%~40.13%),小穗粒数、穗粒数的变异系数最大,分别为30.56%、40.13%;相关及通径分析表明,对其重要性状之一千粒重影响最大的是每小穗小花数(r=0.168,P<0.05),直接通径系数为0.364,其余性状依次为穗长(r=0.235,P<0.05)、小穗粒数(r=0.126);聚类分析在欧氏距离为6.50处将群体材料分成三大类群,其中第1类和第3类冰草材料都具有高秆、多枝叶的特点,可用于选育优质牧草,第1类冰草材料具有多小花多穗粒等优良性状,可成为饲草和小麦遗传育种的优良种质资源。To explore the relationship among nine agronomical characteristics of Agropyron. and provide the theoretical basis for improving the efficiency of wheat breeding, the F1 generation of the cross between Agropyron mongolicum （female parent） and the diploid A. cristatum （male parent） was analysed. The nine agronomic characteristics of 116 F1 plants was analysed using different methods of data analysis. The results showed that all characteristics exhibited significant genetic variation （11.2 % - 40.13%）. The variation in grains per spikelet and grains per spike were the greatest, with a value of 30.56% and 40.13% respectively. Correlation and path analysis showed that florets per spikelet had a significant effect on thousand kernel weight with an r value of 0.168 （P〈0.05） and a direct path coefficient of 0.364. This was followed by spike length （r = 0.235, P〈0.05） and kernels per spikelet （r=0.126）. The 116 plants of the Agropyron F1 population were clustered into three groups. The first and third group had greater plant height and more foliage. As such, these groups could represent varieties with high-quality forage grass for breeding. The first and third group had numerous positive characteristics, including more florets per spikelet, more spike grains, among others, which represent good germplasm resources for forage grass and wheat breeding.

关 键 词：冰草属植物 F1 群体 农艺性状 相关分析 聚类分析 

分 类 号：S543.9[农业科学—作物学]