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- Genetic variability of high molecular weight glutenin subunits in bread wheat from continental Portugal, Madeira and Canary IslandsPublication . Santos, Teresa M. M. dos; Nóbrega, Humberto; Ganança, José Filipe Teixeira; Silva, Emanuel; Afonso, Desire; Gutiérres, Abílio F. M.; Slaski, Jan J.; Khadem, Manhaz; Carvalho, Miguel Â. A. Pinheiro deThe genetic variability of high molecular weight glutenin subunits (HMWGS) composition at the Glu-1 loci in bread wheat (Triticum aestivum L.) was studied electrophoretically using the SDS–PAGE in 3,470 individuals representing 159 populations originated from the Canary Islands (Spain), the Archipelago of Madeira (Portugal) and the continental Portugal. A total of 25 alleles were detected, resulting in 69 different allele combinations. The geographical distribution of the high molecular weight glutenin alleles confirms historical data regarding circulation of wheat germplasm between the Iberian Peninsula and Madeira and between Madeira and the Canary Islands and vice versa.