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Published online 27 March 2006
Published in Crop Sci 46:1107-1116 (2006)
© 2006 Crop Science Society of America
677 S. Segoe Rd., Madison, WI 53711 USA
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Can Spring Wheat-Growing Megaenvironments in the Northern Great Plains Be Dissected for Representative Locations or Niche-Adapted Genotypes?

Alireza Navabia, Rong-Cai Yanga, James Helmb and Dean M. Spanera,*

a Department of Agricultural, Food, and Nutritional Science, University of Alberta, Edmonton, AB, T6G 2P5, Canada
b Field Crop Development Centre, Second Floor, Agriculture Building, 5030- 50 Street, Lacombe, AB, T4L 1W8, Canada


Figure 1
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  		Fig. 1. Dendrogram resulting from a shifted multiplicative model cluster analysis of sites for Alberta hard-red spring wheat regional trials in 1998. Numbers on clusters represent the frequency of crossover interaction as a ratio of total possible number of crossover interaction in each cluster (%), determined using the Azzalini-Cox test (Baker, 1988). For sites, areas, and soil zones see Table 1.

 

Figure 2
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  		Fig. 2. The genotype main effect plus genotype x location biplots for the Alberta spring wheat regional trials 1998 to 2001 generated by site regression model analyses. Each site is represented by a three-character abbreviation (see Table 1 for the list of abbreviations). Wheat genotypes are identified by numbers, except for the responsive genotypes at the vertices of the polygons that have been identified by their commercial names.

 




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