T. Savova1*, B. Dyulgerova1, G. Panayotova2
1Institut of Agriculture, 8400 Karnobat, Bulgaria
2Institut of Agriculture and Seed Science “Obraztsov chiflik”, 7000 Rousse, Bulgaria
Abstract. The objective of this study was to study genetic diversity among winter oat accessions by using multivariate analyses: hierarchical cluster and principal component (PC) analyses. The study was conducted in the Institute of Agriculture, Karnobat, during the period 2005 – 2011. Oat germplasm consisting of 25 genotypes was evaluated for length of vegetation period, winter resistance, lodging resistance, plant height, length of panicle, number of spikelets and grain in 1 panicle, grain weight per panicle,1000-grain weight. The Dunav 1 variety was used for comparison as a standard for winter oats. There was a significant genetic diversity among the studied accessions, which allows selection of appropriate parents with characters important for oat breeding. In the direction of early ripening the accessions: РА 7606-51, РА 7307-70 and NC 79-43; low stem: РА 7409-151, РА 7915-1342, РА 8019-1; lodging resistance: РА 7507-14, РА 7219-19, РА 7617-3460 may be included as suitable sources. The best combination of agronomically valuable traits was established for accessions: РА 7617-3658, РА 8014-1356 and РА 7603-7. Panicle length, number of spikelets and grain in the panicle, weight of grain in one panicle and 1000-grain weight were the important traits in differentiating the genotypes.