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¹ Tarla Bitkileri Merkez Araştırma Enstitüsü Müdürlüğü, Ankara
² Adnan Menderes Üniversitesi Ziraat Fakültesi Tarla Bitkileri Bölümü, Aydın - Study was conducted at the experimental fields of Aegean Agricultural Research Institute (AARI) in 2009-2010 and 2010-2011 years with two trials (OYT-1 and OYT-2). There were 25 genotypes in each trial. Experimental design was completely randomized block design with four replications in the both trials. Cluster analysis was conducted for beta glucan content of oat genotypes. Groups in the cluster dendogram were identified based on similarities. The number of the main groups was 4 and 5 for OYT-1 and OYT-2, respectively. Genotype 9, 14 and 18 had high beta glucan content, one of the important selection criteria for oat breeding, in OYT-1 and OYT-2, respectively. Standard genotypes were in the same group for both yield trials. Keywords : Oat, Avena sativa L.,beta glukan, similarity, cluster analysis