Combining ability and economic heterosis for seed cotton yield and attributing traits in American cotton (Gossypium hirsutum L.)
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Date
2016
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Publisher
CCSHAU
Abstract
The present study was undertaken to estimate economic heterosis with the objective of
exploring possibilities of its commercial utilization and to study the combining ability effects.
The material for the present investigation comprised of Forty American cotton hybrids
developed on four female parents (testers) using ten male parents (lines) in line x testers mating design
and one standard check (HHH 223).The experimental material was grown at CCS Haryana Agricultural
University, Cotton Research Station Sirsa, during Kharif 2014-15 in a randomized block design with
three replications.
Observations were recorded for eight characters namely, plant height, number of
monopods, number of bolls, boll weight, ginning out turn, seed index, lint index and seed cotton yield
per plant.
The economic heterosis was calculated over standard check HHH 223. Considerable amount of
heterosis were recorded for seed cotton yield and other related characters under study. The hybrids
H1117 × GS-10, H1117 × HS-180, H1117 × PUSA-1803, H1098 × HS-180 , H1098 × RED 5-7,
H1117 × Tamcot SP-23 and H1098 × GS-10 exhibited heterosis of more than 70 per cent and hence
warrant their further testing over locations for commercial utilization.
The combining ability analysis revealed that additive variance was more than non- additive
variance in the expression of all the traits. Among female parents H1117 was the best general
combiner. In general, none of the male and female parents was found to posses high gca effects for all
the characters under study. However, considering the economic importance of various characters HS-
180, GS-10, PUSA-1803 and RED 5-7 among the male and H1117 among female may be used for
future breeding.
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Keywords
Heterosis, Combining ability, Upland cotton.