Correlation, cluster, and path analysis of agronomic traits of the F2 population from tetraploid hybrid crested wheatgrass
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.
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