Detection and characterization of a glutenin subunit with unusual high Mr at the Glu-A1 locus in hexaploid wheat.

A hexaploid wheat landrace collected from the Baluchistan province of Pakistan was found to possess a novel high-molecular-weight glutenin subunit (HMW-GS). The subunit has a very slow electrophoretic mobility as revealed by SDS-PAGE, and its molecular weight is comparable to that of the highest molecular weight glutenin subunit ("2.2" encoded in the D-genome) reported so far in hexaploid wheat varieties and landraces of Japanese origin.