Relationship between grain yield and yield components of barley genotypes by multivariate statistical methods

To assess some traits of 20 barley genotypes, the experiment was done in a randomized complete block design with four replications in Agriculture and Natural Resources Research Station, of Khorramabad in 2011-2012 growing season. Grain yield and some other agronomic traits were measured. Differences between genotypes were compared in terms of plant height, biological yield, grain yield and hectoliter weight was significant. Genotypes of 1 and 15 had the highest grain yield. Simple correlation coefficients indicated that grain yield, biological yield, straw yield and spike weight had positive and significant correlation. Highest correlation was observed in grain yield and biological yield (r = 0.90**). The results of stepwise regression analysis showed biological yield, spike weight, flag leaf length, flag leaf area, spike length, awn length were the traits influencing on grain yield. Therefore, these attributes can be considered as the most important plant characteristics and they could be a suitable choice to improve the yield of barley genotypes breeding programs. Spike weight, biological yield had the highest direct effect on grain yield. Also, Genotypes of 1 and 15 had the highest yield. The traits such as weight, spike, flag leaf length, flag leaf area, awn length and head length which had high correlation with grain yield were effective on yield increment.