بررسی صفات تعیین کننده عملکرد ذرت دانه ای (Zea mays L.) در دو شرایط آبیاری معمول و تنش کم آبی

In order to study effect of drought stress on morphologic traits, yield and yield components of 28 new hybrids of corn to heat and drought stress in addition 6 commercial hybrid (as control), an experiment was carried out on based of complete randomized block design with three replication under normal irrigation and drought stress in Khorasan Razavi Agricultural Research and Natural Resources Institute Mashhad, Iran on 2010. Results of analysis of variance showed that in both condition there are significant different between all hybrids for all traits. Results of hybrid means comparison with Duncan’s multiple range test showed that in normal irrigation condition S.C500 hybrid and in stress condition N.11 hybrid was better than others in yield trait (13.79 and 5.69 respectively). Genetic correlation between traits under stress condition showed that number of kernel in row was the highest correlation with yield and in normal irrigation ear diameter was higher than other traits correlated. The results showed that under no stress conditions, hybrids with the mean number of ear per plants that have more thick ear, heavier and more kernel per row and the same time have a lower percentage of wood, will be higher in total yield. Generally, according to results of path analysis, review and compare traits affecting grain yield in two environments can be concluded that plant traits in maize, kernel weight per ear, ear weight and percentage of kernel, deficit quickly affected and determining the limitations of plant production. Breeding for these traits can be obstacles on the path taken from the performance and the ultimate goal of increasing performance in low-Irrigation conditions.