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There is evidence from several plant species that low, nonfreezing temperatures induce the accumulation of specific proteins in leaves and stems. Only recently, however, have attempts been made to identify changes in gene expression in dormant buds of woody plants in response to chilling. For our investigations, we have used dormant blueberry plants representing three different species, placed them in a room maintained at about 4C, and collected buds after 0, 500, 1000, and 1500 hours. Proteins were extracted from bud samples and analyzed by SDS-PAGE. Results indicated that various cultvars and species responded differently to chilling unit accumulation. The most dramatic changes were noted in the  V .  corymbosum  cultivar `Bluecrop'. The concentration of about 6 polypeptides with molecular weights ranging from 60-115 kD increased by 500 hours. The concentration of a 17.5 kD polypeptide increased after 1000 hours and the concentration of a 114 kD polypeptide decreased throughout the treatment.

CHANGES IN GENE EXPRESSION ASSOCIATED WITH CHILLING-UNIT ACCUMULATION IN DIFFERENT SPECIES OF BLUEBERRY