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Vol.1 , No. 4, Publication Date: Sep. 22, 2014, Page: 65-71
&description=An experiment was executed to study the genetic parameters underlying the inheritance of phenological traits of common bean: number of days to flowering and maturity. The experiment comprised of 36 genotypes (8 parents and 28 forward F1 diallel crosses) which were grown in randomized complete block design with two replicates at Mandura, North West Ethiopia. Statistical significant difference was observed between genotypes, parents and progenies for the traits considered. Significant mean squares due to 'a' and 'b' components of Hayman were observed for both the traits. Thus both additive and non-additive types of gene actions were important in governing the inheritance of these traits. However, non-additive type of gene action was more important for number of days to maturity whereas both are almost equally important for the inheritance of number of days to flowering .The b1 and b3 components of Hayman showed statistically significant results, implying the presence of directional dominance, and residual dominance and dominance effects specific to individual crosses, respectively in the expression of the traits. The b2 component of Hayman, however, did not show statistically significance difference for the traits, indicating the absence of gene asymmetry in the expression of the traits. The wr/vr graph for both the traits revealed that the inheritances of both the traits were governed by over dominance with additive gene action and epistasis was not involved. The direction of dominance was confirmed that it was operating in the decreasing direction.&picture=http://www.aascit.org/aascit/decorators/img/journal/923.jpg)
| [1] | Mulugeta Atnaf, Ethiopian Institute of Agricultural Research, Pawe Research Center, P. O. Box 25, Pawe, Ethiopia; Addis Ababa University, Collage of Natural Sciences, Department of Microbial, Cellular and Molecular Biology, P.O. Box 1176, Addis Ababa, Ethiopia. |
| [2] | Kassahun Tesfaye, Addis Ababa University, Collage of Natural Sciences, Department of Microbial, Cellular and Molecular Biology, P.O. Box 1176, Addis Ababa, Ethiopia. |
| [3] | Kifle Dagne, Addis Ababa University, Collage of Natural Sciences, Department of Microbial, Cellular and Molecular Biology, P.O. Box 1176, Addis Ababa, Ethiopia. |
| [4] | Hussein Mohammed, Hawassa University, College of Agriculture, Department of Plant Sciences, P.O. Box 05, Hawassa, Ethiopia. |
An experiment was executed to study the genetic parameters underlying the inheritance of phenological traits of common bean: number of days to flowering and maturity. The experiment comprised of 36 genotypes (8 parents and 28 forward F1 diallel crosses) which were grown in randomized complete block design with two replicates at Mandura, North West Ethiopia. Statistical significant difference was observed between genotypes, parents and progenies for the traits considered. Significant mean squares due to 'a' and 'b' components of Hayman were observed for both the traits. Thus both additive and non-additive types of gene actions were important in governing the inheritance of these traits. However, non-additive type of gene action was more important for number of days to maturity whereas both are almost equally important for the inheritance of number of days to flowering .The b1 and b3 components of Hayman showed statistically significant results, implying the presence of directional dominance, and residual dominance and dominance effects specific to individual crosses, respectively in the expression of the traits. The b2 component of Hayman, however, did not show statistically significance difference for the traits, indicating the absence of gene asymmetry in the expression of the traits. The wr/vr graph for both the traits revealed that the inheritances of both the traits were governed by over dominance with additive gene action and epistasis was not involved. The direction of dominance was confirmed that it was operating in the decreasing direction.
Keywords
Diallel, Hayman, Phaseolus Vulgaris, Inheritance, Phenological Traits, Ethiopia
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