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GENETIC POTENTIAL
AND HERITABILITY STUDIES FOR SOME POLYGENIC TRAITS IN COTTON (GOSSYPIUM
HIRSUTUM L.)
MUSHTAQ AHMAD1*, NAQIB ULLAH KHAN1, FIDA MOHAMMAD1,
SHERAZ AHMED KHAN1,
IQBAL MUNIR2,
ZARINA BIBI3 AND SALMA SHAHEEN3
Abstract: The
research work comprising genetic potential and heritability in a 6 × 6 F1
diallel cross of upland cotton was conducted during 2008 and 2009 at
Khyber Pakhtunkhwa Agricultural University, Peshawar, Pakistan. The
parental cultivars used in the diallel crosses were CIM-473, CIM-496,
CIM-499, CIM-506, CIM-554 and CIM-707. Genotypes manifested significant
variations for plant height, monopodia plant-1, sympodia
plant-1, bolls sympodia-1, bolls plant-1
and seed cotton yield plant-1. On average, the F1
hybrids manifested significant increase over parents for plant height
(11.5%), sympodia plant-1 (6.34%), bolls sympodia-1
(4.83%), bolls plant-1 (9.95%) and seed cotton yield plant-1
(26.07%). Broad sense heritability was high with expected response to
selection being for plant height (0.81 & 17.85 cm), monopodia plant-1
(0.95 & 0.49), sympodia plant-1 (0.92 & 4.00), bolls sympodia-1
(0.90 & 0.74), bolls plant-1 (0.90 & 9.45) and seed cotton
yield plant-1 (0.76 and 38.84 g), respectively. Seed cotton
yield exhibited significant positive correlation with all traits except
monopodia plant-1. Parental cultivars CIM-506 and CIM-554
performed better in their specific cross combinations and revealed
reasonable mean performance. The F1 hybrids CIM-506 ×
CIM-554, CIM-473 × CIM-554, CIM-554 × CIM-506 and CIM-554 × CIM-707
manifested best genetic potential for majority of the traits. Results
also revealed that the above four F1 hybrids have the
potential to be used for hybrid cotton production and can also be
studied in segregating generations for further improvement and stability
in their genetic potential for seed cotton yield and its components.
1Department
of Plant Breeding and Genetics, Khyber Pakhtunkhwa Agricultural
University, Peshawar, Pakistan.
2Institute
of Biotechnology and Genetic Engineering, Khyber Pakhtunkhwa
Agricultural University, Peshawar, Pakistan
3Department
of Soil and Environmental Sciences, Faculty of Agriculture, Gomal
University, Dera Ismail Khan, Pakistan.
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