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Defining Subregions and Estimating Benefits for a Specific-Adaptation Strategy by Breeding Programs

A Case Study

^a Istituto Sperimentale per le Colture Foraggere, 29 viale Piacenza, 26900 Lodi, Italy
^b Institut Technique des Grandes Cultures, BP 16, El-Harrach, Alger, Algeria
^c Istituto Agronomico per l'Oltremare, 4 via A. Cocchi, 50131 Florence, Italy

View larger version (19K): [in a new window]   Fig. 1. Geographical position of test sites within the Algerian durum wheat region and definition of two subregions that extends site classification by AMMI + cluster analysis through the application of a discriminant function to long-term winter mean temperature in a GIS (from Annicchiarico et al., 2002a; see Table 1 for site names).

View larger version (18K): [in a new window]   Fig. 2. Nominal yield of best-performing durum wheat genotypes as a function of the score on the first GL interaction PC axis of 16 locations (site score is showed by black triangles; see Table 1 for site names).