Stady of some morphological attributes in spring bread wheat genotypes under weather condition of Moghan

In order to study of some agronomic and morphological attributes affecting grain yield in spring bread wheat genotypes and also, to identify and introduce superior cultivars, an experiment was conducted in 2010 at the farm of Moghan Agricultural Faculty, univ. of Mohaghegh Ardabili Plant material included 27 wheat cultivars and 2 lines were planted in a Randomized Complete Block Design with three replications. The analysis of variance showed that among genotypes for all traits studied had significant difference in level %1 probability. Shiroudi cultivar the average grain yield(5370kg/ha), 1000grain weigth(37/4gr) and number of grains per spike(47/3) was higher than other cultivars. Akbari cultivar of biological yield and number of spike (m2), had the highest average. Biologic yield, spike length (cm) and number of grain per spike showed a significant positive correlation with grain yield. Biological yield had a significant positive correlation with plant height (cm), spike length (cm) and number of grain per spike. Because of the inverse relationship between yield components, number of spike (m2) showed a significant negative correlation with number of grains per spike. Path Coefficients Analysis showed biologic yield have the most direct effect (r=0.65) on grain yield. the principle component analysis, the first four component justified, %81 of the total variation. Biologic yield, spike length (cm) and number of spike(m2), have important role in explanation the first component. The results of cluster analysis were grouped 29 genotypes into 4 clusteres. The Shiroudi, Nick-Nejad and Alborz cultivars of grain yield and some traits studied than other cultivars, had higher average and the top varieties were introduced.