Asian Journal of Bio Science

B. K. Athoni ¹, C. Nandini ²

Affiliations
1 All India Co-Ordinated Research Project on Sunflower, Zonal Agricultural Research Station, U.A.S., G.K.V.K., Bengaluru (Karnataka), IN
2 Department of Genetics and Plant Breeding, University of Agricultural Sciences, G.K.V.K., Bengaluru (Karnataka), IN

Abstract

A study was undertaken to assess the magnitude of heterosis involving seventeen inbred lines of sunflower. The inbred comprised of five new male sterile lines and twelve diverse restorer lines (six branching and six non-branching) which were crossed in all possible combinations. The resulting 60 F₁ hybrids along with their parents were studied for the extent of heterosis during summer 2006 for nine characters by adopting line × tester analysis, considerable average heterosis was observed for all characters studied. Highest magnitude of average heterosis was observed for seed yield per plot (150.34) followed by seed yield per plant (118.86), head diameter (26.79), plant height (15.32), thousand seed weight (7.49) and oil content (2.13) for the characters days to 50 per cent flowering, the hybrids recorded negative average heterosis. Percentage contribution of component characters, viz., thousand seed weight, plant height and head diameter towards expression of heterotic effect for seed yield was to the extent of 15.06, 30.82 and 53.86 per cent, respectively.

Keywords

Heterosis, Sunflower, Inbred Lines, Line × Tester Analysis.

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B. K. Athoni ¹, C. Nandini ¹

Affiliations
1 All India Co-ordinated Project on Sunflower, University of Agricultural Sciences, G.K.V.K., Bengaluru (Karnataka), IN

Abstract

To know the performance of branching and non branching restorer lines of sunflower in producing high yielding and high oil content hybrids, a study was undertaken at University of Agricultural Sciences, Dharwad to assess the magnitude of heterosis involving seventeen inbred lines of sunflower. The inbred comprised of five new male sterile lines and twelve diverse restorer lines (six branching and six non-branching) which were crossed in all possible combinations during Kharif-2005. The resulting 60 F₁ hybrids along with their parents were studied for the extent of Heterosis during Summer 2006 for nine characters by adopting line × tester analysis, considerable average heterosis was observed for all characters studied. Highest magnitude of average heterosis was observed for seed yield per plot (150.34) followed by seed yield per plant (118.86), head diameter (26.79), plant height (15.32), thousand seed weight (7.49) and oil content (2.13) for the characters days to 50 per cent flowering, the hybrids recorded negative average heterosis. Percentage contribution of component characters, viz., thousand seed weight, plant height and head diameter towards expression of heterotic effect for seed yield was to the extent of 15.06, 30.82 and 53.86 per cent, respectively.

Keywords

Heterosis, Sunflower, Branching, Non Branching, Line × Tester Analysis.

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B. K. Athoni ¹, G. T. Basavaraja ¹

Affiliations
1 All India Coordinated Research Project on Sunflower, University of Agricultural Sciences, G.K.V.K., Bengaluru (Karnataka), IN

Abstract

To study the genetic variability, association analysis and genetic diversity for productivity in soybean, a field experiment was conducted during Kharif 2005 at University of Agricultural Sciences, Dharwad, India. The experiment comprised of 84 genotypes of which, most of the cultivars were released in India, along with some indigenous and exotic lines. Observations on 11 productivity traits of soybean were recorded. The data were subjected to variability and multivariate analysis. The analysis of variance revealed the prevalence of significant difference among the genotypes for all the 11 characters studied. Plant height was the only character which showed high phenotypic and genotypic co-efficient of variation while days to maturity, number of nodes per plant and oil content recorded a low phenotypic and genotypic coefficient of variation and rest of characters recorded moderate phenotypic and genotypic coefficient of variation. Number of pods per plant, pod weight per plant, 100 seed weight and oil content showed positive and significant correlation with seed yield per plant. Path coefficient analysis revealed maximum positive direct effect of pod weight on seed yield per plant followed by 100 seed weight and its indirect effect through other characters were also considerably high. Therefore, emphasis may be laid on this character for improving seed yield. There was not much amount of diversity was obtained in the material representing diverse eco-geographical regions of the country revealed no relationship between geographic diversity and genetic diversity.

Keywords

Genetic Variabilty, Genetic Diversity, Soybean, Co-Efficient of Variation.

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