| dc.description.abstract | Twenty genetically diverged genotypes of upland cotton (Gossypium hirsutum L.) received
from Cotton Development Board, Dhaka were used to investigate their performances in three
locations (Jessore, Rangpur and Dinajpur) over four consecutive years (2010-11, 2011-12,
2012-13 and 2013-14). At the beginning of investigation, the genotypes were characterized
and evaluated on 12 morphophysiological characters including seed cotton yield (kg ha-1).
Days to 1st flowering was long and ranged from 47-56 days, suggested prolong crop duration
in cotton. The unbrust bolls plant-1 was a detrimental character for reducing yield potential of
the genotypes. The PCV(Phenotypic Coefficient of Variation) value was higher than
corresponding GCV(Genotypic Coefficient of Variation) for all characters, suggested
polygenic controlled of the characters and thus had environmental effects (locations and
years) for the full expression of the characters. Among the twelve characters, plant height,
bolls per plant, boll weight and seeds per boll exhibited higher than 90% heritabilities but
plant height itself showed wider difference between PVC and GCV, indicated the strong
effect of environment. Therefore, except plant height other three characters might into
consideration in selection or hybridization program to improve the ultimate character seed
cotton yield. High heritability (h2
b=90.36%) coupled with high genetic advanced (58.49%)
was estimated for bolls plant-1 hence the character might improve through simple selection
which ultimately improve yield potential in cotton. A total of 55 pairs of characters
combinations were drawn both at genotypic (rg) and phenotypic (rp) levels to estimate
correlation coefficients. Vegetative branches plant-1 and unbrust bolls plant-1 exhibited
negative and significant association and six characters namely secondary fruiting branches
plant-1, main stem nodes plant-1, days to 1st flowering, bolls plant-1, boll weight and seeds
boll-1 showed positive and significant association with seed cotton yield both at genotypic and
phenotypic levels. But simultaneous consideration of genetic parameters, genotypic and
phenotypic correlation coefficients and path analysis of genotypic correlation with seed
cotton yield. Five characters might consider constructing selection indices for ultimate
improve of seed cotton yield among the genotypes. The higher genotypic correlation
coefficient in respect of related phenotypic correlation coefficient suggested inherent
relationships of the characters either positive or negative directions with seed cotton yield. | en_US |
