International Research Journal of Agricultural Sciences
International Research Journal of Agricultural Sciences Vol. 1(2) pp. 19-29, June 2013 ©2013 Advanced Research Journals
Full Length Research Paper
Genetic variability and traits association in bread wheat (triticum aestivum l.) genotypes
Awale Degewione 1, Takele Dejene2 and Mohammed Sharif3
Department of Dry-Land Crop Research, Somali Region Pastoral and Agro-Pastoral Research Institute, P.O.Box:398, Jijiga, Ethiopia.
*Corresponding author: Awale Degewione, E-mail:firstname.lastname@example.org
Bread wheat is one of the most important small cereal crops produced in different regions of Ethiopia. The aim of this study was to estimate the extent of genetic variability and traits association in bread wheat genotypes. Twenty six bread wheat genotypes obtained from ICARDA-CIMMYT through Kulumasa Agricultural Research Center were tested at Gode and Kelafo research sites from 2009/10 to 2011/12 under irrigation in randomized complete block design (RCBD) with three replications. Ten agronomic traits were included in the study. Variances component methods were used to estimate components of variation, heritability and genetic advance. The bread wheat genotypes differed significantly for all characters studied, indicating existence of sufficient genetic variability within different genotypes. High phenotypic coefficient of variation and genotypic coefficient of variation were recorded grain filling period, number of tillers plant-1 and grain yield plot-1. High genetic coefficient of variation along with high heritability and genetic advance were recorded in grain yield plot-1 and days to heading. Positive and Highly significant association were obtained between grain yield plot-1, number of tillers plant-1 and grains spike-1 at both phenotypic and genotypic levels. Path coefficient analysis displayed maximum positive direct effect on grain yield plot-1 mostly by days to heading, grain filling period, number of tillers plant-1 and grains spike-1, was major contributors of towards grain yield plot-1. The two traits which showed significant contribution towards grain yield plot-1 were number of tillers plant-1 and grains spike-1 and these traits should be given emphasis for future bread wheat yield improvement program.
Keywords: Bread wheat, variability, heritability, association studies, path analysis