Asian Journal of Bio Science

T. Basavaraja ¹, M. Asif ¹, S. K. Mallikarjun ¹, S. Gangaprasad ²

Affiliations
1 Department of Genetics and Plant Breeding, University of Agricultural Sciences, G.k.v.k., Bengaluru, Karnataka, IN
2 Department of Genetics and Plant Breeding, College of Agriculture, U.a.s. (b), Shimoga, Karnataka, IN

Abstract

A field experiment was conducted to study the extent of genetic variability in yield and yield attributing traits under irrigated conditions. Genetic parameters of variability and heritability of 13 characters were studied in 100 genotypes of local rice. Co-efficients of variation were high for number of productive tillers per plant, grain yield per plant, number of tiller per plant, panicle number, plant height, panicle length, test weight, number of spikelet per panicle. The maximum genotypic co-efficient of variability and phenotypic co-efficient of variability were observed for test weight, number of productive tillers per plant, number of spikelet per panicle, amylase per cent and grain yield/plant (g). High heritability coupled with high genetic advance as per cent of mean were observed for days to 50 per cent flowering, test weight, number of spikelet per panicle, per cent of spikelet fertility, protein per cent and grain yield/plant (g) will be useful for further breeding programme. Indicated the possibility of yield and quality improvement through adoption of selection procedures.

Keywords

Rice, Variability, Quality, Yield

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T. Basavaraja ¹, M. Asif ¹, S. K. Mallikarjun ¹, S. Gangaprasad ²

Affiliations
1 Department of Genetics and Plant Breeding, G.K.V.K., University of Agricultural Sciences, Bengaluru, Karnataka, IN
2 Department of Genetics and Plant Breeding, College of Agriculture, U.A.S. (B), Shimoga, Karnataka, IN

Abstract

The associations among the yield components and direct and indirect influence of yield components on the grain yield of local rice were investigated at Agricultural college farm, Navile, Shimoga. The experiment was laid out in a 10 x 10 Simple Lattice Design with two replications which consisted of 100 local genotypes during Kharif 2010. The correlation analysis indicated that grain yield was significantly associated with panicle length, test weight, number of tiller per plant, number of productive tiller per plant, number of spikelet per panicle, per cent spikelet fertility and amylase per cent. Path co-efficient analysis revealed that days to 50 per cent flowering, plant height, panicle length, panicle number, number of productive tiller per plant, per cent spikelet fertility and amylase per cent had positive direct effect on grain yield. Hence, selection on these traits could be suggested to bring simultaneous improvement of yield and yield attributes.

Keywords

Correlation, Path Analysis, Rice, Yield

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D. Mrinmoy ¹, M. Asif ¹, K. T. Venkatesha ¹, K. V. Vijaya Kumar ¹

Affiliations
1 Department of Genetics and Plant Breeding, University of Agricultural Sciences, G.K.V.K., Bengaluru, Karnataka, IN

Abstract

To find the nature of gene action in okra, experiment was carried out with 10 x 10 half-diallel mating design and found 45 F₁ cross combinations. The present study indicated that both additive and non-additive gene action present in three traits i.e., days to 50 per cent flowering, fruit weight and number of nodes per plant and dominant gene action with asymmetrical distribution of genes and over dominance was found for all the characters. The positive and non-significant estimate of 'F' for all other characters except fruit weight suggests that the dominant genes are preponderant. In the present study the significance of t² value suggested the failure of the one or more assumption of diallel analysis for all the characters except days to 50 per cent flowering, fruit girth, plant height and number of nodes per plant.

Keywords

Okra, Half-diallel Cross, Gene Action

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