Membrane- and cell wall-associated heat shock proteins in two genotypes of barley seedlings

The heat-shock (HS) response of two genotypes (cv. Onice winter type, and cv. Georgie, spring type) of barley (Hordeum vulgare L.) was compared. Protein synthesis was markedly reduced in cv. Onice was higher than in cv. Georgie. The pattern of cytosolic, membrane and cell wall HSPs was analysed by SDS-PAGE in coleoptiles and roots of the two genotypes. Differences and similarities in coleoptiles and roots of the same genotype and between the two genotypes were observed. In roots of the genotype Onice, LMW and HMW HSPs isolated from the cytosol, membranes and cell walls were resolved into a diverse array of polypeptides by two-dimensional gel electrophoresis. Present results confirm the de novo synthesis of cytosolic and membrane HSPs, and demonstrate, for the first time, their presence in cell walls.