PJB-2018-628
GENOTYPE X ENVIRONMENT INTERACTION STUDIES FOR YIELD OF NEWLY EVOLVED STRAINS OF UPLAND COTTON (Gossypium hirsutum L.)
Saifullah Abro
Abstract
Eighteen newly evolved upland cotton strains developed through conventional and mutation breeding techniques along with two commercial check varieties viz., CIM-496 and CRIS-134 were evaluated at five locations for two years in Sindh. Data were recorded on seed cotton yield from each location and analyzed statistically. To assess the stability for seed cotton yield among genotypes, the genotype x environment (GxE) interaction studies was performed. The results from the combine analysis of variance depicted that the mean square for seed cotton yield were highly significant for genotypes, environments and genotype x environment interaction (GxE). Regression coefficient (b) value of genotypes ranged from 0.644 in genotype NIA-HM2-1 to 1.33 in NIA-84. Genotypes NIA-M-30 showed the maximum seedcotton yield (3.509 ton/ha) with low regression coefficient (b=0.893) and deviation from regression coefficient (S2d=0.015). Other four genotypes viz., NIA-80, NIA-83, NIA-Bt-2 and NIA-Perkh also produced higher yield (3.36, 3.32, 3.31and 3.25 ton/ha respectively) with regression coefficient (b=0.972, 0.918, 0.99 and 0.916 respectively) and deviation from regression coefficient (S2d=0.025, 0.003, 0.00 and 0.024 respectively), indicated wide adaptability to the range of environments. While the cotton genotypes NIA-HM-327, NIA-84 and NIA-HM48 showed highest regression coefficient values (b= 1.204, 1.331 and 1.291 respectively), which suggest their specific adaptation to favourable environments.
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