The study of relationships between some phenological and morphological traits with grain yield in some maize inbred lines

One of the important purposes of corn breeding is to increase the grain yield. The first step in producing hybrid corn is to produce inbred lines with higher seed yield; On the other hand، the seed yield of an inbred line depends on its physiological and morphological characteristics. So، in order to evaluate the relationship between phonological and morphological characteristics of maize inbred lines with the grain yield، this study was carried out in randomized complete block design with three replications in summer of 2008. The results revealed positive and significant correlation between the yield components. A positive and significant correlation was also observed between length period of sowing date until physiologic maturity with total number of kernel per ear. The result of stepwise regression، introduced three traits، total number of kernel per ear، 100-grain weight and length period of pollination until physiologic maturity as the most important justifying 71. 6 percent of the total variation. The total number of kernel per ear having the share 37. 5 percent of this amount was known as the most important trait. In this study the results of path analysis revealed that the traits number of kernel per row، number of kernel row per ear، and 100-grain weight had most positive and direct effects on total grain yield perear.