Title: GENETIC BEHAVIOUR FOR SOME POLYGENIC YIELD CONTRIBUTING TRAITS IN WHEAT (TRITICUM AESTIVUM L.)
Abstract: A study was conducted in the Department of Plant Breeding and Genetics, University of Agriculture Faisalabad, Pakistan during 2005-06. In this study five wheat genotypes viz. Chenab-2000, Rohtas-90, SH-2002, Uqab-2000 and 243-1 were crossed in complete diallel fashion to study gene action for plant height, peduncle length, flag leaf area, number of tillers per plant, 100-grain weight and grain yield per plant. Analysis of variance proved to be significant for all characters. The significant deviation of joint regression value “b” from zero and non-significance of “t” square value, suggested the absence of epistasis for all traits which in turn attested fitness of the data for simple additive dominance model. Additive genetic component “D” proved to be significant for all traits, but dominant components H1 and H2 were higher in magnitude for plant height, flag leaf area, number of tillers per plant and grain yield per plant. It illustrated the preponderance of dominance genetic effects for inheritance while additive genetic component was more imperative for manipulation of peduncle length and 100-grain weight. Dominant genes at most of the loci were more than recessive genes for all traits except peduncle length and 100-grain weight. The dominant alleles were in excess for peduncle length, flag leaf area, number of tillers per plant and grain yield per plant. The component that swayed strongly by environment was 100-grain weight. High magnitude of narrow sense heritability (h 2 n.s) was noticed for peduncle length (0.77) and 100-grain weight (0.71) and illustrated fixable and additive heritable variation for these traits. The operation of over-dominance was observed for plant height, flag leaf area, number of tillers per plant and grain yield per plant whereas peduncle length and 100-grain weight was under additive type of gene action with partial dominance. It implied that peduncle length and 100-grain weight can significantly be improved by pursuing pedigree method while heterosis can be exploited for plant height, flag leaf area, number of tillers and grain yield per plant.
Publication Year: 2010
Publication Date: 2010-01-01
Language: en
Type: article
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Cited By Count: 9
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