B. Dyulgerova*, D. Dimova, N. Dyulgerov
Institute of Agriculture, 8400 Karnobat, Bulgaria
Abstract. The objective of this study was to identify genetically divergent spring barley parents with desirable spike traits for hybridisation particularly for Bulgarian feed barley breeding program. The study was conducted in the Institute of Agriculture, Karnobat, during the period 2011 – 2012. Barley germplasm comprising of 27 genotypes was evaluated for seven quantitative traits through cluster and principal component analyses. Significant differences were observed among the genotypes regarding all the traits studied. Genotype had most influence on spike length. Year and genotype X year interaction had most strong impact on the grain weight per a spike. Principal component analysis indicated 74.5% of the total variation. Varieties AC Hawkeys, AC Roser and Creme having positive values for principal component 1 and 2 were of considerable breeding interest because of their good combination for the studied traits. Cluster analysis revealed that 29 accessions of spring barley were clustered into four main groups. The following crosses were recommended based on the genetic divergence and mean performance of studied traits: genotypes from group I (CDC Sister, Manny, Trochu, Stander, Excel, MNbrite, Creme, Vivar) with genotypes from group II (Malebo, AC Renger, Kakapo, AC Roser).