Genetic Variability in selected F2 populations of desi cotton
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Date
2007
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Publisher
UAS, Dharwad
Abstract
An investigation was carried out during kharif 2005 to assess the variability generated
by hybridization and to study the association pattern among the component traits of seed
cotton yield. Five crosses involving seven genotypes viz., DD-8NLE, RDC-88, 9749, Blach-
1, MDL 2582, MDL 2601 and DLSA-17 were selected based on their F1 performance for
components of seed cotton yield and fibre equality traits. The segregating populations thus
obtained were evaluated for eight quantitative traits on 100 randomly selected plants in each
cross. There was increase in mean and variance in F2 populations for majority of traits except
for seed index and lint index as compared to the parents. A wide range was observed for boll
number per plant, lint yield per plant, boll weight, ginning out turn and seed cotton yield per
plant.
The GCV, heritability and GAM estimates were higher in F2s for seed cotton yield per
plant, number of bolls per plant, lint yield per plant. High heritability coupled with high
genetic advances were estimated for boll number, lint yield and seed cotton yield per plant in
all the segregating populations.
Seed cotton yield recorded significant positive correlation with number of bolls, lint
yield in all the segregating populations and with boll weight in three segregating populations
indicating that more emphasis should be given for number of bolls, boll weight and lint yield
for improvement in desi cotton yield through selection. Path coefficient analysis of seed
cotton yield across the different populations revealed the maximum direct contribution of
number of bolls per plant, boll weight and lint yield and further the same trait had maximum
indirect contribution through lint yield per plant confirming these traits as important seed
cotton yield attribute. More number of transgressive segregants were recorded for boll weight
followed by lint index and seed index traits.
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Keywords
Genetics and Plant Breeding