PJB-2018-382
GENETIC ANALYSIS IN WHITE MAIZE (ZEA MAYS L.) USING DIALLEL POPULATION
Nazir Ahmad
Abstract
Gene action for some production traits was explored in a partial diallel fashion, involving six inbred lines of maize. The analysis revealed preponderance of non-additive type of gene action was showed by greater values of dominance (H1, H2) than additive (D) genetic component of variance for most of the traits. For most of the traits, non-uniform distribution of positive and negative alleles, with asymmetrical pattern of genes was observed in the parents. For most of the studied traits, the proportion of H2/4H1 was below than maximum value (0.25). For all characters, high broad and low narrow sense heritability were recorded. Increase in number of dominant genes for most of the traits were showed by positive and significant value of ‘F’ and it was confirmed by high value (>1) of (4DH1)1/2 + F/(4DH1)1/2 – F). For most of the traits, dominance due to heterozygous loci ‘h2’ and expected environmental component ‘E’ was significant. For all the traits, average degree of dominance (H1/D)1/2 was greater than unity, indicating the importance and more contribution of over-dominance type of gene action. From graphical analysis, for most of the traits, P6 (SW-6-6-2-2-1) showed maximum number of dominant genes being the closest to origin, while P1 (WD-2), being farthest from the origin displayed maximum number of recessive genes. On the basis of mean performance, P3 (SW-4-9-1), P4 (EV3-120-2-2-2-1-1) and P6 (SW-6-6-2-2-1) performed better for most of the traits and exhibited greater genetic potential for use in subsequent maize breeding programs.
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