Polymorphism of the high molecular weight glutenin subunits was studied in 456 accessions of the wild wheat Triticum turgidum var. dicoccoides (2n = 4x = 28; genomes AABB), originating from 21 populations in Israel. A total of 50 different SDS PAGE migration patterns were observed, resulting from the combinations of 15 subunit patterns of the A genome and 24 subunit patterns of the B genome. Most migration patterns consisted of five subunits, varying between three and six. The migration patterns of the A genome had zero to three subunits-two being most common. The apparent molecular weights (MWs) of the slowest migrating subunit (114,000 to 103,500) and of the next in rate of migration (106,000 to 96,000) were highly correlated (r =0.97). Also, both subunits were either present (in most accessions) or absent. In 82.3 per cent of the accessions, the third subunit (MW 76,000 to 71,500) was absent, while in 16.9 per cent of the accessions all three subunits of the A genome were absent. The migration patterns of the B genome had one to three subunits-three being most common. The slowest migrating subunit (99,500 to 93,000) was present in almost all cases (993 per cent). The MWs of the next two subunits (90,500 to 82,000 and 86,000 to 78,000, respectively) were highly correlated (r = 0.95). Also, either both subunits were present, as in most cases (94