【摘要】 为深入开展四倍体冰草数量性状产量基因定位分析、优良新种质选育研究，以四倍体杂交冰草F2群体的120个分离单株及其亲本蒙古冰草(Agropyron mongolicum)、航道冰草(Agropyron cristatum ‘Fariway’)为材料，对其株高、叶长、叶宽、穗长、穗宽、茎粗、茎叶比和单株鲜重8个产量相关的农艺性状进行了测定分析。结果表明，该群体各性状均为受多基因控制的数量性状，呈正态分布，且存在超亲分离现象。聚类分析显示，在欧氏距离为17.5处，将F2群体分为3个类群，其中第1、3类分别表现出优质和高产的特性。相关及通径分析表明，对单株产量影响最大的性状是株高(r=0.265,P <0.01)，直接通径系数为0.174，其后依次为穗长(r=0.214,P <0.05)、茎叶比(r=0.197,P> 0.05)和茎粗(r=0.109,P> 0.05)。本试验结果可为高产优质的四倍体杂交冰草新品种培育奠定基础。更多还原

【Abstract】 To lay a foundation for further gene mapping analysis of quantitative traits related to yield and the breeding of excellent new germplasm for tetraploid wheatgrass, 120 individual plants from the F₂ population of tetraploid crested wheatgrass and their parents（Agropyron mongolicum × A. cristatum ‘Fariway’） were used as materials. Eight agronomic traits, including plant height, leaf length, leaf width, panicle length, panicle width, stem diameter, stem-leaf ratio, and fresh weight per plant were analyzed. The results showed that all of these traits were quantitative traits controlled by multiple genes, with a normal distribution and transgressive segregation. Cluster analysis showed that the F₂ population was divided into three groups at a Euclidean distance of 17.5. The first and third groups showed superior quality and high yield,respectively. Correlation analysis and path analysis showed that plant height had a significant effect on fresh weigh per plant,with a correlation coefficient of 0.265（P < 0.01） and a direct path coefficient of 0.174. This was followed by spike length（r =0.214, P < 0.05）, stem-leaf ratio（r = 0.197, P > 0.05）, and stem diameter（r = 0.109, P > 0.05）. The results provided the basis for breeding new varieties of tetraploid hybrid crested wheatgrass with high quality and high yield.更多还原