Genetic Analysis of some Important Quantitative Traits in Bread Wheat (Triticum aestivum L.)

Yıl 2016, Cilt: 2 Sayı: 2, 47 - 53, 30.07.2016

Nataša Ljubičić

Öz

The estimation of gene effects in the inheritance of yield components is one of the most important tasks in wheat breeding
programs. The objective of this study was to estimate gene effects for the number of grains and grain weight per spike
in ten wheat crosses with five basic generations: parent cultivars (P1, P2), first and second filial generations (F1, F2)
and first backcrosses (BC1). The gene effects responsible for inheritance of these two important traits were estimated on
the basis of generation mean analysis, using an additive-dominant model with three and six-parameters. The adequacy
of the additive-dominance model with three-parameters was tested using the Scaling test and Chi-square (χ2) test. A
three-parameter model was found as adequate to explain variation for the both traits in three crossing combinations. The
magnitude of additive gene effects (d) was smaller than the corresponding dominance effects (h) in most crosses for both
traits. The application of six-parameter models indicated the significant epistatic effects for explaining genetic variation
for these traits. The inheritance of these traits was influenced by additive×additive (i) and dominance×dominance (l) type
of non-allelic interactions in the study. Duplicate gene interactions were also observed in most crosses of both characters
which are difficult to exploit in breeding programs. These results implied that the selection for the improvement of these
traits should be applied in further generations in wheat breeding..

Anahtar Kelimeler

Wheat, Additive-dominance model

Kaynakça

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