Estimation of Genetic Parameters among Seed Cotton Yield and its Attributing Characters in Upland Cotton (Gossypium hirsutum L.)
Yanal ahmad Alkuddsi1
M.R. Gururaja Rao1
1 Department of Genetics and Plant Breeding, University of Agricultural Sciences, Dharwad, Karnataka, India
2 Department of Agronomy, University of Agricultural Sciences, Bangalore, Karnataka, India
3 Agricultural Research Station, Bavikere, Therikere, Karnataka, India
International Journal of Molecular Evolution and Biodiversity, 2013, Vol. 3, No. 5 doi: 10.5376/ijmeb.2013.03.0005
Received: 06 Jul., 2013 Accepted: 30 Jul., 2013 Published: 06 Dec., 2013
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Preferred citation for this article:
Alkuddsi et al., 2013, Estimation of Genetic Parameters among Seed Cotton Yield and its Attributing Characters in Upland Cotton (Gossypium hirsutum L.), International Journal of Molecular Evolution and Biodiversity Vol.3, No.5, 24-32 (doi: 10.5376/ijmeb.2013.03.0005)
The success of a good breeding programme usually depends upon the quantum of genetic variability present in the breeding materials. Thus, knowledge on genetic variability, heritability and genetic advance in tetraploid cotton is very essential for a breeder to choose good parents and to decide the correct breeding methodology for crop improvement. The experiment was carried out during kharif 2008 in cotton (G. hirsutum L.) to determine variability, heritability and gentic advance for seed cotton yield and its components. Fourty eight hybrids produced through Line x Tester mating design using 6 hirsutum non Bt lines (RAH 318 (L1), RAH 243 (L2), RAH 128 (L3), RAH 146 (L4), RAH 97 (L5) and RAH 124 (L6)) and 8 hirsutum non Bt testers ( SC 14 (T1), SC 18 (T2), SC 7 (T3), SC 68 (T4), RGR 32 (T5), RGR 24 (T6), RGR 58 (T7) and RGR 37 (T8)) to generate information on genetic parameters in respect of seed cotton yield and yield attributing characters (days to 50% flowering, plant height, number of bolls per plant, number of sympodia per plant, number of mnopodia per plant, mean boll weight, ginning outturn, seed index, and lint index). The 48 F1 hybrids were sown in a randomized complete block design (RCBD) with two replications at the Agricultural Research Station, Bavikere, UAS, Bangalore. The mean performance of 48 hybrids used in the present study indicated that the hybrid RAH 97 x SC18 was superior for 4 characters viz., plant height, mean boll weight, seed cotton yield per plant and seed index, while the hybrid RAH 146 x RGR37 was superior in respect of 2 characters, plant height and seed cotton yield per plant. The analysis of variance among 48 hybrids and checks tested in 2 replications indicated that mean sum of squares for hybrids was highly significant for all the characters except number of monopodia per plant, mean boll weight and seed index indicating presence of significant differences among the hybrids evaluated in respect of these traits. The mean sum of squares for hybrids vs checks was highly significant for plant height number of sympodia per plant, number of bolls per plant, seed cotton yield per plant and ginning outturn revealing superiority of hybrids over checks and presence of heterosis in respect of these traits. High genotypic co-efficient of variability were obtained for seed cotton yield (16.69) and number of bolls per plant (14.15), while low for days to 50% flowering (1.15) and number of monopodia per plant (2.84). However, high phenotypic co-efficient of variability were obtained for seed cotton yield (25.24) and number of bolls per plant (26.54) and low for days to 50% flowering (3.15) and ginning outturn (11.13). Plant height (6.98), number of bolls per plant (3.62), seed cotton yield (2.58) and ginning outturn (1.83), showed high magnitude of genetic advance, whereas, number of bolls per plant (15.54) and seed cotton yield (22.74) exhibited high genetic advance expressed as a percentage of the mean.
Variability; Heritability; Genetic advance; Gossypium hirsutum L.