Asian Journal of Bio Science

C. S. Danaraddi ¹, Sangamesha Hakkalappanavar ², Shilpa B. Biradar ³, Manjunath Tattimani ⁴, Mohan R. Dandagi ⁵

Affiliations
1 Department of Agricultural Entomology, University of Agricultural Sciences, Dharwad (Karnataka), IN
2 Department of Agricultural Entomology, College of Agriculture, Navile, Shimoga (Karnataka), IN
3 Department of English, Kuvempu University, Shimoga (Karnataka), IN
4 Department of Agronomy, C.C.S. Haryana Agricultural University, Hisar (Haryana), IN
5 Department of Seed Science and Technology, University of Agricultural Sciences, Dharwad (Karnataka), IN

Abstract

Morphometrical studies comprising of fifteen characters of Trigona iridipennis Smith from eight places of Karnataka were made during 2006-2007. It was found that the bees collected from different parts varied in the morphometrical parameters, but the variations were not significant. All the bees had five hamuli. These studies indicate the occurrence of T. iridipennis throughout Karnataka.

Keywords

Morphometrical, Stingless Bee, Trigona iridipennis.

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Basavaraj Dandigadasar ¹, Manjunath Tattimani ², C. S. Danaraddi ³, Shilpa B. Biradar ⁴, Mohan R. Dandagi ⁵

Affiliations
1 Department of Genetics and Plant Breeding, University of Agricultural Sciences, Raichur (Karnataka), IN
2 Department of Agronomy, Chaudhary Charan Singh Haryana Agricultural University, Hisar (Haryana), IN
3 Department of Agricultural Entomology, University of Agricultural Sciences, Dharwad (Karnataka), IN
4 Department of English (Optional), Kuvempu University, Shimoga (Karnataka), IN
5 Department of Seed Science and Technology, University of Agricultural Sciences, Dharwad (Karnataka), IN

Abstract

A study was conducted to assess variability in 79 genotypes of linseed. Data were recorded on twelve characters. These genotypes showed considerable variability for all the parameters. Wide range of PCV and GCV were observed for number of capsules per plant, number of seeds per capsule and seed yield per plant. The heritability estimates ,were ranging between 30.20 per cent (number of seeds per capsule) to 99.7 per cent (days to maturity). The per cent mean genetic advance was high for number of branches per plant, seed yield per plant, days to flowering and number of capsules per plant. Seed yield per plant was positively and significantly correlated with number of branches per plant, number of capsules per plant and harvest index at both phenotypic and genotypic levels. Genotypic correlation coefficients, were higher than corresponding phenotypic one for most of character combinations. Path coefficient analysis revealed that harvest index exhibited highest positive direct effect on seed yield per plant followed by number of branches per plant. Indirect effects’ of number of branches per plant and number of capsules per plant via harvest index was positive, but indirect effect was more than that of the direct effect on seed yield.

Keywords

Variability, Correlation, Path Analysis, Linseed, PVC, GCV.

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