ASSESSMENT OF GENOTYPE ENVIRONMENT INTERACTION IN UPLAND COTTON (Gossypium hirsutum L.)
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Date
2010
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Punjab Agricultural University, Ludhiana
Abstract
ABSTRACT
The present investigations were carried out to study the stability of both Bt and non-Bt genotypes over the nine environments which includes three locations viz. Ludhiana, Faridkot and Bathinda, and three sowing dates viz. first week of May, mid May and last week of May, for days to germination, days to first flower opening and first boll opening, days to final maturity, number of monopods and sympods per plant, plant height, boll setting percentage, boll number, boll weight, seed cotton yield, lint yield, ginning outturn, seed index, lint index, stalk yield, biomass, 2.5% span length, fibre strength, fibre fineness, uniformity ratio and oil content. The pooled analysis of variance revealed highly significant genotypic, environmental and G x E interaction mean squares for all the traits studied for both Bt and non Bt genotypes. Highly significant mean squares for heterogeneity between regressions were also observed for all the characters studied. The analysis of variance over the locations for each date of sowing and over the dates for each location revealed highly significant genotype location interactions (G x L) and genotype dates interaction (G x D) for almost all the characters studied both in Bt and non Bt genotypes. Highly significant heterogeneity between regressions was also observed for most of the characters both over locations and sowing dates in Bt and non Bt genotypes which indicated that the predictions can be made about the stability of the genotypes over the environments. On the basis of mean performance it was observed that days to first flower, days to first boll opening, days to final maturity, number of monopods and sympods, plant height, number of bolls per plant, seed cotton yield, lint yield decreased with late sowing, whereas boll weight, ginning outturn, seed index, lint index, fibre length, strength and fineness increased in late sowing i.e. in last week of May sowing for most of the Bt and non Bt genotypes.
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