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CELL MEMBRANE THERMO-STABILITY
STUDIES THROUGH JOINT SEGREGATION ANALYSIS IN VARIOUS WHEAT POPULATIONS
KALIM ULLAH1, NAQIB ULLAH KHAN2, SHAH JEHAN
KHAN3, MUHAMMAD IRFAQ KHAN4, IMDAD ULLAH KHAN3, SAMRIN GUL2,
HABIB-UR-RAHMAN3 AND REHMAT ULLAH KHAN2
Abstract: Using joint segregation
analysis (JSA) technique as statistical approach, mixed inheritance
analysis for cell plasma membrane as membrane thermal stability (MTS)
was assayed in two parental lines (P1, P2) and their four populations
(F1, BC1, BC2, F2) of four wheat crosses, viz., Hashim-08 × LU-26,
Farid-06 × Shafaq, Parula × Blue Silver and TD-1 × D-97603 at Faculty of
Agriculture, Gomal University, Dera Ismail Khan, Pakistan during crop
season 2011-12. Results revealed that MTS was under control of two mixed
groups of genes i.e., additive-dominant-epistatic major genes plus
additive–dominant-epistasis of polygenes (model E) in Hashim-08 × LU-26
and Farid-06 × Shafaq crosses, respectively. In cross Parula × Blue
Silver, it was governed by mixed genes i.e. one major-gene and
additive-dominance-epistatic polygenes (model D). However, in cross TD-1
× D-97603, the MTS was under the influence of mixed epistasis of two
major genes plus polygenes (model E-1). Polygene variation and polygene
heritability were higher than major gene variation and heritability in
crosses Hashim-08 × LU-26 and Farid-06 × Shafaq. In crosses Parula ×
Blue Silver and TD-1 × D-97603, the major gene variation and
heritability were higher than polygene variation and heritability,
indicating maximum contribution of the major genes. While in cross TD-1
× D-97603, epistatic components were also positive and due to which the
polygene heritability was almost zero. Moderate to high environmental
variation in the MTS for segregating generations revealed that the said
trait was highly persuaded by the environment. However, the genetic
behavior of the MTS suggested that early selection for MTS in the
crosses Hashim-08 × LU-26 and Farid-06 × Shafaq would be efficient.
Whereas, the delayed selection in crosses Parula × Blue Silver and TD-1
× D-97603 until the accumulation of maximum favorable genes will be
effective.
1PCCC Cotton Research Station, Dera Ismail Khan, Pakistan
2The University of Agriculture, Peshawar, Pakistan
3Faculty of Agriculture, Gomal University, Dera Ismail Khan, Pakistan
4Nuclear Institute for Food and Agriculture (NIFA), Peshawar, Pakistan
*Corresponding author e-mail:
nukmarwat@yahoo.com
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