Genetic behaviour of wheat under irrigated and drought stress environment
2003
Arshad, M. | Chowdhry, M.A. (University of Agriculture, Faisalabad (Pakistan). Dept. of Plant Breeding and Genetics)
A diallel cross involving eight bread wheat genotypes were evaluated to determine the genetic behaviour of wheat genotypes across the environments. The experimental material was planted under irrigated as well as drought stress conditions. Data collected on yield and related traits revealed highly significant differences among genotypes under both sowing conditions. Graphical analysis revealed that additive action of genes for plant height and grains per spike under irrigated conditions changed to over dominance under drought. However, it was also found that gene action for flag leaf area, 1000- grains weight and grain yield per plant remained the same over environments. It was also observed that parental genotypes shifted their positions in the graphs from recessive to dominant or the midway or vice versa, showing different genetic constitution for the same trait in response to environmental change. Genotypes displaying similar constitution under both sowing conditions showed that they contain stable genes for those particular characters and may prove useful in future breeding strategies.
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