Genetics Of Yield And Fibre Quality Characters In Interspecific Crosses Of Cotton (G. Hirsutum L. X G. Barbadense L.)
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Date
2013
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Mahatma Phule Krishi Vidyapeeth, Rahuri.
Abstract
The present study entitled “Genetics of yield and fibre quality characters in interspecific crosses of cotton (G. hirsutum L. x G. barbadense L.) was carried out with objective to study the heterosis, combining ability, gene action between yield and yield contributing characters. The crosses were made by using 4 lines and 8 testers during summer 2008. The resulting 32 crosses were evaluated along with parents (4 + 8) and standard check (Phule-388, DCH-32) at AIC Cotton Improvement Project, M.P.K.V., Rahuri in Randomized Block Design with three replications during summer 2009. The combinations RHBB-9718 x RHCb-001 (201.00), RHC-712 x Giza-7 (191.00), RHC-717 x RHCb001 (190.33), RCH-717 x Giza-7 (189.33) recorded high seed cotton yield (g/plant) over better parent and standard check Phule-388 (185) and DCH-32 (169.44). The per se performance of these crosses were high. RHBB-9718 x RHCb-001 (Seed cotton yield and Boll weight), RHC-712 x Giza-7 (Number of bolls per plant), RHC-712 x PIMA-84 (100 seed weight), RHC-702 x Br-547 (number of sympodia), RHC-702 x Br-547 (number of monopodia), RHC-717 x Br-545 (plant height), RHC-712 x RHCb-011 (days to first flowering), RHC-717 x RHCb-004 (days to 50 per cent flowering), RHC-702 x PIMA-84 (days to first boll bursting) RHC-702 x RHCb-011 (days to maturity), RHC-702 x RHCb-004 (biomass at harvest) exhibited highly significant and the highest heterobeltotic percentage for the respective characters. In case of fibre quality characters cross combinations RHC-717 x RHCb-011 for 2.5 per cent span length, RHC-717 x Br-547 for fibre strength, RHC-712 x Br547 for micronaire, RHC-712 x PIMA-84 for fibre maturity; RHC-712 x PIMA-84 for fibre elongation; RHC-712 x RHC-004 for lint index exhibited significant heterobeltiosis and standard heterosis in desirable direction. The mean sum of squares due to gca and sca were significant for majority of the characters studied indicating variability in combining ability of various lines and testers and their crosses. Among the females, RHBB-9718 was the best general combiner as exhibited significant gca effects in desirable direction for seed cotton yield and yield contributing characters. However among male parents Giza7 was the best general combiner exhibiting high gca effects for seed cotton yield, ginning percent, days to first boll bursting, plant height in desirable direction.
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