Indian Society of Genetics & Plant Breeding

Inheritance ot tillers-per-plant in durum wheat (Triticum durum Dest.)

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Gene effects were analyzed using means of number of
tlllers-per-plant of 12 generations vIz., both parents, Fl'
, first backcross generations (BC I and BC2) second
backcross generations (BCII , BCI2, BC21 and BC22) along
with BC
IS and BC2s derived by selfing of BCI and BC2
populations of three crosses Involving six diverse cultlvars
of durum wheat (Triticum durum Desf.). To determine the
nature of gene actions governing number of tillers-perplant, generation mean analysis was used under normal
and late sown 'environments. The ten-parameter model
was adequate In ail the cases except in the cross Cocorit
71 x A-9-30-1 under late sown condition where the 3
parameter model was adequate. Epistatic effects,
particularly trigenic types were predominant over additive
and dominance effects under both normal and late sown
environments. Duplicate epistasis was observed In two
crosses under normal sown environment. Epistatic
interactions particularly non-fixable types were the
contributors to the significant and positive heterosis.

Keywords: Durum wheat, non-allelic interaction, duplicate epistasis, heterosis


Year: 2002
Volume: 62
Issue: 2
Article DOI: NA
Print ISSN: 0019-5200
Online ISSN: 0975-6906



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