Separating correlation coefficients into direct and indirect effects of important morphological traits on grain yield in 28 bread wheat genotypes under terminal drought stress
Journal Title: International Journal of Farming and Allied Sciences - Year 2013, Vol 2, Issue 24
Abstract
Analyzing the correlation of various traits and components of grain yield is a very important issue in selection and breeding programs for genotypes, thus an experiment was conducted using 28 bread wheat genotypes in the form of completely randomized blocks design with two replications in order to investigate the correlation of various traits with wheat grain yield under terminal drought stress and to determine the contribution of those traits with maximum effect on grain yield and also to explore the direct and indirect effects of grain yield on its components and vice versa. Results from variance analysis were indicative of a significant difference between study genotypes in terms of plant height, biological yield, grain number per spike, spike length, spike weight, days to anthesis, days to heading, days to maturity, grain filling period, ratio of Peduncle to height, spike number/m2 and grain yield. In studying the simple correlation of traits of grain yield with traits of biological yield, traits such as spike weight and spike number/m2 produced a positively significant correlation, in addition, apart from traits such as fertile tiller, days to anthesis and harvest index all other traits had a positively insignificant relation with grain yield. Results of step by step regression indicated that spike length, spike weight and spike number per m2 with a description coefficient of as much as 0.73 accounted for the most part of grain yield changes. Path analysis of grain yield and its components indicated that 1000 grain yield had the highest direct effect (0.629) on grain yield, and after that spike number per m2 had positively direct effect (0.573) on grain yield. Also, the direct effect of grain number per spike on yield was positive (0.457). The indirect effects through these traits don’t play a major role on grain yield. Results from this study are indicative of the fact that traits such as 1000 grain weight and spike number per m2 can be considered criteria for selecting productive bread wheat genotypes.
Authors and Affiliations
Reza shahryari, Amir Garib Eshghi,Vahid Mollasadeghi, and Reza Serajamani
Keywords
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