Variability of quantitative traits in genetically divergent alfalfa (Medicago sativa L.) genotypes: [Master thesis]
2007
Milic, D.
Studied in this paper was the genetic divergence of 30 alfalfa genotypes. Genotype variability was analyzed using eight quantitative traits, namely green forage yield, dry matter yield, plant height, shoot (stem) number per plant, internode length and number, leaf contribution to yield, and stem diameter. Significant variability among genotypes was found for green forage yield (CV=14.9%), dry matter yield (CV=14.8%), shoot number per plant (CV=11.3%), stem diameter (CV=9.9%), and plant height (CV=5.0%). The genotypes varied less for internode length (CV=4.3%), internode number (CV=3.8%), and leaf contribution to yield (CV=3.4%). Cluster analysis divided the genotypes based on the degree of similarity, while dendrogram structure indicated genotype division into two clusters and seven subclusters as well as high genotype variability and divergence for all the traits under study. Principal com ponent analysis was used to determining the structure of the sources of variability. Four principal components explaining 95% of the genotype variability were chosen for interpretation. The greatest communality with the first principal components was found for internode length, plant height and leaf contribution to yield, which were all highly interdependent. The second principal component was defined by the agronomically most important traits, namely green forage yield, dry matter yield and stem number per plant. The third and fourth principal components were defined by internode number and stem diameter.
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