The influence of the rye genome on expression of heat shock proteins in triticale

Abstract

The heat shock protein profiles from Secale cereale L. cv Imperial, Triticum aestivum L. cv Chinese Spring, S. cereale x T. aestivum amphiploid, and the seven disomic S. cereale addition lines to T. aestivum were used to compare the wheat, rye, and triticale Heat Shock Protein profiles and to study the influence of the rye genome on heat shock protein expression in triticale. Three-day-old seedlings were heat shocked for 2 h at 40 °C in the presence of (35)S-methionine, and polypeptides from root tissues were subjected to one- or two-dimensional gel electrophoresis. The wheat and rye heat shock protein profiles each consisted of > 150 heat shock proteins, of which 94 were sufficiently reproducible to construct a standard map. There were 11 unique rye heat shock proteins compared to 22 unique wheat heat shock proteins. The triticale heat shock protein profile resembled the rye parent more than the wheat parent. There were 22 heat shock proteins expressed uniquely by wheat that were not expressed in triticale. Rye chromosomes 1 and 3 exhibited a substantial repressive influence on the expression of 95% of the unique wheat heat shock proteins in triticale, while rye chromosome 4 appeared to have the least repressive influence on expression of the unique wheat heat shock proteins in triticale.