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Heterosis and combining ability studies in cotton

KrishiKosh

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Title Heterosis and combining ability studies in cotton
 
Creator S.S.Jyotiba
 
Contributor B.R.Patil
 
Subject Genetics and Plant Breeding
 
Description The present study was conducted at ARS, Dharwad during kharif 2006-07 to estimate
heterosis and combining ability of the plant morphological, yield and yield attributing traits
and fibre quality traits. GMS based hybrids were derived by crossing 18 lines of G. arboreum
with 3 testers of G. herbaceum in line × tester fashion with two replications in a randomized
block design.
Analysis of variance for combining ability revealed significant differences among
lines, except for number of sympodia per plant. Whereas, in testers, significant differences
were observed with respect to number of sympodia per plant, number of bolls per plant, seed
cotton yield per plant, seed index, lint index and micronaire value. Among hybrids,
significant differences were noticed for all characters, except for number of sympodia per
plant. The lines, GMS-7, Million-GMS, SGMS-4 and 8401-GMS were found good
general combiners for seed cotton yield and boll number. The line, Million-GMS was found
good general combiner for seed cotton yield and fibre quality traits like 2.5 per cent length
and fibre strength.
The cross, Million-GMS × Jayadhar recorded highest significant positive sca effects
for seed cotton yield also had significant sca effect for seed cotton yield per plant, boll
weight, fibre strength and maturity coefficient. Two crosses, GAKA-423 × H-221 and 8401-
GMS × Jayadhar exhibited significant positive sca effect for ginning outturn and seed index.
The cross, GMS-4-1 × DDhc-11 recorded significant positive sca effect in desirable direction
for 2.5 per cent span length and fibre strength.
The hybrids, Million-GMS x Jayadhar and GAKA-423 x H-221 were recorded
significant positive heterosis for seed cotton yield over better parent and all the checks in
present study. In addition the two hybrids also possessed better fibre properties like 2.5 per
cent span length and fibre strength in comparison with all the checks in present study.
 
Date 2016-10-22T09:07:53Z
2016-10-22T09:07:53Z
2007
 
Type Thesis
 
Identifier http://krishikosh.egranth.ac.in/handle/1/81328
 
Format application/pdf
 
Publisher UAS, Dharwad