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GENETIC DISPARITY AND
RELATIONSHIP AMONG QUANTITATIVELY INHERITED YIELD RELATED TRAITS IN
DIALLEL CROSSES OF UPLAND COTTON
MARYAM BIBI1*,
NAQIB ULLAH KHAN1, FIDA MOHAMMAD1, ROZINA GUL1,
ABDUL AZIZ KHAKWANI2, OBAID ULLAH SAYAL2,
IJAZ AHMAD KHAN1 AND MUHAMMAD IDREES1
Abstract:
In quantitative
genetics, development of high yielding genotypes from parental cultivars
of same ancestry is some what confusing as compared to genetically
diverse parents. However, sufficient recombinations through allelic
variations in mating of closely-related populations result in superior
agronomic performance. Development of improved cotton genotypes is one
of the prime objectives of any cotton breeding programmes. Genetic
divergence and yield potential of parental cotton genotypes versus their
diallel hybrids, relationship of yield with various morpho-yield traits
and their heritability were studied in 8 × 8 F1 diallel
hybrids and their parental cultivars in Gossypium hirsutum L.
during 2008-09 at Khyber Pakhtunkhwa Agricultural University, Peshawar,
Pakistan. Highly
significant (p≤0.01)
differences were
observed among parental genotypes and F1 populations for all
the traits.
Results revealed that F1 hybrids i.e., CIM-506 × CIM-554,
CIM-473 × CIM-554, CIM-446 × CIM-496 and CIM-446 × CIM-554 produced
significantly higher number of sympodia, bolls per plant and seed cotton
yield. Some F1 populations showed incredible performance for
plant height, locules per boll and seeds per locule. Seed cotton yield
manifested positive association with morpho-yield traits which also
accounted for greater genetic variations to yield being dependent trait.
Heritabilities (broad sense) were moderate to high in magnitude for all
traits. Results revealed that F1 populations with larger
genetic potential, positive relationship between yield and yield
contributing traits and moderate to high heritability can guide
intensive selection and improvement per se in segregating
populations.
1Khyber Pakhtunkhwa Agricultural University, Peshawar, Pakistan
2Faculty of Agriculture, Gomal University, Dera Ismail Khan, Pakistan
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