Indian Society of Genetics & Plant Breeding

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GENETIC ARCHITECTURE OF HARVEST INDEX IN TETRAPLOID WHEAT (TRITICUM DURUMDESF.)

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Gene effects were analysed using mean harvest index of 12 populations, viz., both parents,
Ft, Fz, first backcross generations, BCt and BC:!, second backcross generations, BCtt, BCt:!,
BCzt and BCn along with BCts and BCza derived by selfing BCt and BCz populations of
three crosses involving six diverse cultivars of Triticum durum to determine the nature of
gene actions governing harvest index through generation mean analysis under normal and
late sown environments. The ten-parameter model was adequate in almost all cases to
account for the variability in generation means. Epistatic effects, particularly trigenic type
were predominant over additive and dominance effects under both normal and late sown
environments. Duplicate epistasis was observed frequently under late sown environment
only. Hybridization systems, such as biparental mating and/or diallel selective mating
which exploit both additive and nonadditive gene effects, simultaneously could be useful
in the improvement of harvest index in durum wheat.
 

Keywords: Durum wheat, harvest index, nonallelic interactions, duplicate epistasis, hybridization system.

Info

Year: 1995
Volume: 55
Issue: 3
Article DOI: NA
Print ISSN: 0019-5200
Online ISSN: 0975-6906

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