Genetic Variability and Association among Agronomic Characters in Some Genotypes of Barley (Hordeum Vulgare L.) Grown in Chencha and Angacha, Southern Ethiopia

Genetic Variability and Association among Agronomic Characters in Some Genotypes of Barley (Hordeum Vulgare L.) Grown in Chencha and Angacha, Southern Ethiopia

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Title: Genetic Variability and Association among Agronomic Characters in Some Genotypes of Barley (Hordeum Vulgare L.) Grown in Chencha and Angacha, Southern Ethiopia
Author: Meseret, Zerihun; Dr. Yohannes, Petros
Abstract: Studying genetic variability in crops is important for improving the crops and enhancing the production. Genetic variability is the occurrence of differences among individuals due to differences in their genetic composition and/or the environment in which they are raised. Fifteen barley (Hordeum Vulgare L.) genotypes were evaluated for 13 traits in RCBD with three replications at two locations, Chencha and Angacha. The overall objective was to study the extent of genetic variation and association among grain yield and the 12 yield-related traits. The PCV values were slightly greater than the GCV values. Relatively higher PCV values were exhibited by number of kernel/spike (15.31%) at Chencha and number of tiller (21.78%), grain yield (20.75%), biological yield (17.05%) and number of kernels/spike (16.95%) at Angacha. Days to heading showed the highest heritability at both locations, that is, (86.70%) at Chencha and (80.00%) at Angacha. Moderate to high heritability was observed for plant height (66.90%), spike length (56.90%), number of kernel/spike (53.20%), days to maturity (51.20%), number of spikelet (48.50%) and thousand kernel weight (24.30%) at Chencha, and spikelet/spike (45.30%) ,days to maturity (43.90%) and hectoliter weight (41.80%) at Angacha. Estimated genetic advance as percent of the mean was generally low for the 13 characters. Among the characters, number of kernel/spike had higher genetic advance as percent of the mean value at both locations and followed by thousand kernel weight. Grain yield showed positive and significant phenotypic correlation with biological yield, harvest index and hectoliter weight at both locations. Path coefficient analysis showed that biological yield, thousand kernel weight and number of kernel/spike exerted positive direct effect at each of the locations and the two combined at both levels. Exception was genotypic path coefficient at Chencha where only biological yield (0.330) showed positive direct effect. Among these characters biological yield showed the highest direct effect except for the combined genotypic path coefficient where thousand kernel weight (8.973) had the highest positive direct effect. While biological yield and thousand kernel weight can be considered for selection, widening the genetic base of the barley germplasm in Ethiopia is a pre-requisite for a successful breeding program.
Description: 93p.
URI: http://hdl.handle.net/123456789/3257
Date: 2015-04


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