Yield and quality interactions for bread wheat varieties grown in Zambia and Saskatchewan, Canada
1990
Mugala, M.V. (Zambia Canada Wheat Project, Lusaka (Zambia))
The project studied the contribution of genotype-environment (GxE) interaction to variability in yield and quality of eight Zambian bread wheat lines grown at three environmentally diverse locations in Zambia and in Canada (Saskatoon). Harvested grain was tested for variations in breadmaking quality by performing 10 quality tests: flour yield, flour ash, gluten content, protein content, sedimentation, falling number, grind time, mixograph peak height, dough development time, and starch damage. Significant GxE interactions were found for all variables with the exception of starch damage. Depending upon the heritability of the trait and the genetic potential of the wheat lines to adapt to stress situations, response of genotypes among locations was varied. Determination of the nature of the GxE interactions indicated noncrossover interactions for flour yield, grind time, mixograph peak height and dough development time. The relatively consistent rankings of the wheat lines for these variables favors the release of the selected lines over all locations, whereas crossover interactions found for the remaining variables favors different genotypes for specific locations. Protein and gluten content sedimentation value and dough development properties (mixograph) were identified as the most reliable prediction tests for breadmaking quality. Because of cost considerations, it is suggested that genotypes superior for all four traits be developed, so that they could be used countrywide rather than regionally
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