VARIABILITY AND INTERRELATIONSHIP OF AGRONOMIC AND FIBRE QUALITY TRAITS IN MULTI-ADVERSITY COTTON (Cossypium hirsutumL.)
VARIABILITY AND INTERRELATIONSHIP OF AGRONOMIC AND FIBRE QUALITY TRAITS IN MULTI-ADVERSITY COTTON (Cossypium hirsutumL.)
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Date
1999-07
Authors
DJABOUTOU, Cossi Moussibaou
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Abstract
Twenty-five cotton lines comprising 9 multi-adversity resistant lines
from USA and 16 F5 lines derived from crosses between the variety S295 and
the multi-adversity lines were evaluated using a 5 x 5 lattice design with 3
replications.
The analysis of variance for the nineteen characters measured revealed
highly significant (P = 0.01) differences among the entries for days to boll
opening, plant height, boll weight, lint percent, seed index, seed cotton
yield, fibre length and fibre fineness while significant (P = 0.05) differences
were observed among the entries for days to the emergence of the first
flower and first five flowers in the plot, days to first flower on the second
plant, number of nodes to first fruiting branch, indicating the presence of
a wide range of variability in the lines evaluated. The coefficient of variation
ranged from 2.6 - 51.8% for days to opening of the bolls and number of
opened bolls on the second plant, respectively. The line (S295 x TX-CDP 37-HH-
1-83) 119(95) gave the highest yield of 938 kg/ha while the lines (S295 x TX-CDP
37 HH-1-83) 1175(95) and (S295 x TAMCOT SP 21S) 239(95) gave the best lint
percent 43.3 and 43.00% respectively.
The estimates of genotypic variance were positive for all characters
measured except for number of opened bolls on the second plant in the
plot.
Broad-sense heritability estimates ranged from 1.75 - 90.74% for fibre
strength and lint percent, respectively.
Positive but non-significant correlations were found between seed
cotton yield and plant height (rph = 0.299), height to first fruiting branch
(rph = 0.288), number of fruiting branches (rph = 0.160), number of opened
bolls per plot (rph = 0.343), lint percent (rph = 0.385), and lint index (rph -
0.374).
The presence of wide range of variability in the materials studied
could be exploited to improve some lines of interest. These lines could be
used to make crosses which will eventually be used as a base for segregating
breeding populations, from which single plant selections could be made into
progenies, strains, lines and eventually varieties.
Description
A thesis submitted to the Postgraduate School, Ahmadu Bello University in
partial fulfillment of the requirements for the award of the degree of Master
of Science (M.Sc.) in Crop Breeding.
Department of Plant science
Faculty of Agriculture
Ahmadu Bello university, Zaria
Nigeria
JULY 1999
Keywords
VARIABILITY,, INTERRELATIONSHIP,, AGRONOMIC,, FIBRE QUALITY TRAITS,, MULTI-ADVERSITY,, COTTON,, (Cossypium hirsutumL.)