GENE ACTION APPRAISAL FOR SEED YIELD AND RELATED TRAITS IN BREAD WHEAT
N. Akhtar1, A. Waseem1, T. Mehmood2, S. Bano1, A. Raza1 and Ahsan Aziz3
1Department of Plant Breeding and Genetics, College of Agriculture, University of Sargodha, Sargodha, Pakistan; 2Department of Plant Breeding and Genetics, PMAS Arid Agriculture University, Rawalpindi, Pakistan; 3Department of Agronomy, College of Agriculture, University of Sargodha, Sargodha, Pakistan.
Corresponding author: email@example.com
The inheritance pattern understanding of wheat plant traits (qualitative and quantitative) is the prerequisite to improve seed yield of bread wheat. Gene action for seed yield and yield related parameters were studied by generation mean analysis. Two wheat crosses (PARI-73 × V-7682 and V-6055 × Chakwal-50) indicated that seed yield and other studied plant traits of crosses PARI-73 × V-7682 and V-6055 × Chakwal-50 showed significant differences among themselves. The model [md] gave the greatest fit for plant height and spikelets spike-1 in both crosses. In aforementioned crosses parameters like plant height, spikelets spike-1 and of grains spike-1 displayed additive or additive × additive of type gene actions which indicated that selection in early generations would improve these yield related traits. However, traits i.e., spike length, seed yield plant-1 and harvest index in cross PARI-73 × V-7682 showed epistatic effects i.e., [i], [j] and [l] types of gene interaction which demonstrated that genetic behaviour of these traits were complex as and needed more attention. Therefore, it concluded that additive genetic effects played a vital role in expression of most of the yield related traits in wheat and careful selection of these traits in segregating populations would be helpful to increase seed yield.
Key words: Bread wheat, gene action, epistasis, generation mean analysis.