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COMBINING ABILITY ANALYSIS FOR FIBRE QUALITY IN INTERSPECIFIC HYBRIDS OF COTTON

KrishiKosh

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Title COMBINING ABILITY ANALYSIS FOR FIBRE QUALITY IN INTERSPECIFIC HYBRIDS OF COTTON
 
Creator KRISHNA MOHAN, M
 
Contributor GOPINATH, M
 
Subject cotton, planting, yields, sowing, biological phenomena, crossing over, genetics, heterosis, hybrids, gossypium hirsutum
FIBRE, HYBRIDS, COTTON
 
Description The study was carried out during kharif 2010-11 at Regional
Agricultural Research station, Lam Farm, Guntur with 54 hybrids along with
their 15 parents (6 lines and 9 testers) to know the genetic variability,
heritability, genetic advance, correlation and the magnitude of direct and
indirect effects, combining ability and standard heterosis.
The data were recorded on 14 economically important characters viz.,
number of monopodia per plant, number of sympodia per plant, number of
bolls per plant, boll weight (g), seed index (g), lint index (g), ginning out-turn
(%), 2.5% span length (mm), micronaire value (10-6 g/inch), bundle strength
(g/tex), uniformity ratio, fibre elongation (%), harvest index and seed cotton
yield per plant (g).
The analysis of variance revealed significant differences among the
genotypes for all the characters studied indicating that the material used in the
present investigation possessed sufficient variability. High heritability coupled
with high genetic advance as per cent mean was observed for number of
monopodia per plant, number of sympodia per plant, number of bolls per plant,
boll weight, seed index, lint index, micronaire, harvest index and seed cotton
yield per plant indicating the operation of additive gene action with little
influence of environment.
The character association analysis revealed that number of monopodia
per plant, number of sympodia per plant, number of bolls per plant, boll
weight, seed index, 2.5% span length, fibre elongation and harvest index were
found to have significant positive association with seed cotton yield per plant.
Further, the path analysis indicated that number of monopodia per plant,
number of bolls per plant, boll weight, seed index, ginning out turn, 2.5% span
length, micronaire, uniformity ratio, fibre elongation and harvest index showed
direct positive effects on seed cotton yield per plant.
The ratio of general combining ability variance to specific combining
ability variance indicated the preponderance of non-additive gene action for
most of the characters studied. The lines, ACH 703 E, RFS 3438, 0892 B and
REBA B 50 and the testers, RHCB 001, DB 11, TCB 108, CCB 6 and
BRAZIL were identified as good general combiners based on overall gca
effects. The crosses 0892B X CCB 5, CNH 120 MB X RHCB 001and RFS
3438 X SUVIN showed positive and significant specific combining ability
effects for seed cotton yield per plant along with few fibre quality
characteristics.
Significant positive standard heterosis compared to check was observed
for seed cotton yield in two crosses viz., 0892 B X CCB 5 and 0892 B X DB
11.
Thus in the present study the cross, 0892B X CCB 5 was identified as
promising hybrid for high seed cotton yield per plant based on overall
performance i.e., per se performance, sca effects and standard heterosis. But
incase hybrids with good fibre quality characterstics CNH 120 MB X DB 11is
superior to the above hybrids and the seed cotton yield is also on par with the
check.These hybrid can be exploited for commercial cultivation after thorough
testing in different environments for its superiority and stability.
 
Date 2016-06-06T13:50:57Z
2016-06-06T13:50:57Z
2011
 
Type Thesis
 
Identifier http://krishikosh.egranth.ac.in/handle/1/66847
 
Language en
 
Relation D9059;
 
Format application/pdf
 
Publisher ACHARYA N. G. RANGA AGRICULTURAL UNIVERSITY