DIFFERENTIAL-EFFECTS OF THE ENDOSPERM PROTEIN-FRACTIONS FROM TRITORDEUM ON THE SDS-SEDIMENTATION VOLUME

The presence of the Hordeum chilense Roem. et Schult. proteins in the endosperm of the tritordeums (amphiploids H. chilense x wheat) has bee n related to the flour quality of these cereals. The objective of this work has been to evaluate the changes in the amount of Osborne's prot ein fractions and its repercussion on flour quality for these amphiplo ids. The protein fractions were obtained from several lines of hexa-an d octoploid tritordeums along with their durum and bread wheat parents , after a sequential extraction. The results indicated that although t he tritordeums present higher protein contents than the wheats, the di fferent fractions were similar to those observed in wheat. On the othe r hand, the hexaploid tritordeums showed higher SDS-sedimentation valu es for all fractions than their wheat parents. Nevertheless, the octop loid tritordeums and bread wheats presented similar values. The differ ences among species were not great when the quality index was used.