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DIALLEL ANALYSIS OF
SOME QUANTITATIVE TRAITS IN
GOSSYPIUM HIRSUTUM L.
NAQIB ULLAH KHAN1, GUL HASSAN2,
KHAN BAHADAR MARWAT2, FARHATULLAH1, MOULA BUX
KUMBHAR3, AISHA PARVEEN1, UMM-E-AIMAN1,
MUHAMMAD ZAFARULLAH KHAN4 AND ZAHOOR AHMAD SOOMRO3
Abstract: Genetic analysis was
studied in a 6x6 diallel cross following Hayman’s diallel approach and
Mather’s concept of D (additive), H (dominance) genetic components of
variation in F1 and F2 hybrids in a randomized
complete block design in upland cotton during 2003-05 at the
Agricultural Research Institute, Dera Ismail Khan, Pakistan.
Additive-dominance model was used for validation of data and design with
the intention to decipher the inheritance pattern; gene action and
correlation involved in seed cotton yield and yield contributing traits
(boll weight and bolls number) and staple length. Genotypes mean values
differed significantly (p£0.01)
for all the traits. The scaling tests used fully satisfy the
pre-requisites of additive-dominance model and the traits i.e., boll
weight and staple length in F1 generation showed complete
adequacy. All other traits in both generations did not satisfy the
assumptions and makes the additive-dominance model partially adequate
for the data. Additive component (D) was found significant for boll
weight and staple length in both generations and in F1s bolls
per plant. Dominance components (H1, H2) were also
found significant for all the traits in F1s and
non-significant in F2 generation. In F1s the
additive gene action was somewhat partial, while in F2s most
of traits were controlled by additive gene action with some
contradictions between genetic components of variance and Wr/Vr graphs
about expression of inheritance. On the basis of transgressive
segregation, the selection made in the cv. CIM-1100 F2
population indicated possibilities of prompt and effective improvement
in the said traits.
1Department
of Plant Breeding and Genetics, NWFP Agricultural University Peshawar,
Pakistan,
2Department
of Weed Science, NWFP Agricultural University Peshawar, Pakistan,
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