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Evaluation of Advanced Generation Lines Derived from Single and Double Cross Hybrids of Cotton (Gossypium hirsutum L.)

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Title Evaluation of Advanced Generation Lines Derived from Single and Double Cross Hybrids of Cotton (Gossypium hirsutum L.)
 
Creator Chitti Bharat Kumar
 
Contributor Rajesh S. Patil
 
Subject Genetics and Plant Breeding
 
Description One hundred and fifteen genotypes, in F4/F5, isolated from double crosses and
single crosses produced using hybrids from the All India Coordinated Cotton
Improvement Project were evaluated under rainfed situation at Agricultural Research
Station, Dharwad during kharif 2010-11. The detailed objectives included
performance evaluation, assessment of variability generated, association and path coefficient
analyses, assessment of genetic diversity in the new germplasm lines and
molecular diversity among some selected lines of this germplasm.
Genetic variability revealed high values for single cross than the double cross
derivatives for all characters except halo length. Comparison among genotypes
revealed highly productive segregants developed from the crosses. Lines DC-632
(39.10g), DC-131 (37.20g), DC-642 (35.90g) and DC-1101 (35.00g) were better than
the released check Sahana (32.08 g/plant) and another genotype, RAH-221(34.70g).
Association analysis across genotypes revealed highly significant correlation
for seed cotton yield per plant with number of bolls per plant, boll weight, number of
monopodia, sympodial length at 50 per cent plant height, number of nodes, interboll
distance, stem diameter, lint index, ginning outturn and halo length. Physiological
traits viz. photosynthetic rate, stomatal conductance, transpiration rate, chlorophyll
content and relative water content revealed significant correlation with seed cotton
yield.
Path analysis revealed high positive direct effect of number of monopodia,
number of sympodia, interboll distance, boll number and lint index on seed cotton
yield. Among physiological characters the traits, photosynthesis, stomatal
conductance and chlorophyll content revealed high positive direct effect on seed
cotton yield whereas, transpiration rate and relative water content revealed direct
negative effect on seed cotton yield.
The genetic diversity noticed was mainly due to plant height followed by seed
cotton yield, sympodia per plant, halo length and ginning outturn. The single cross
and double cross derived genotypes were grouped in to 12 and 6 clusters respectively.
 
Date 2016-11-10T16:59:14Z
2016-11-10T16:59:14Z
2011
 
Type Thesis
 
Identifier http://krishikosh.egranth.ac.in/handle/1/84977
 
Format application/pdf
 
Publisher UAS, Dharwad