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Regulation of gene expression in corn zea mays by heat shock


, : Regulation of gene expression in corn zea mays by heat shock. Canadian Journal of Biochemistry 60(5): 569-579

Subjecting 5-day old plumules of corn (Z. mays L.) to elevated temperatures of brief periods of time causes the pattern of protein synthesis to shift from the production of a broad spectrum of proteins to the new and (or) enhanced synthesis of a small number of heat-shock polypeptides (HSPs). Most notable is the depressed synthesis of a major polypeptide (relative mass (Mr) =93,000 and isoelectric point = 8.0) normally made at 27.degree. C and the enhanced and (or) new synthesis of polypeptides with Mr of 108,000, 89,000, 84,000, 76,000, 73,000 and 18,000, following 1 h of heat shock. These 6 HSPs resolve into 18 spots by 2-dimensional fluorographic analysis. The induction of the HSPs requires temperatures at or exceeding 35.degree. C for detectable synthesis. Some of the HSPs are synthesized following only 15 min at 41.degree. C and synthesis of all HSPs is observed within 120 min following heat shock. Recovery from heat shock is rapid; after 6-8 h at 27.degree. C following heat shock, the polypeptide pattern is indistinguishable from the control. Extracts from individual heat-shocked shoots produced polypeptide synthetic patterns identical to those from extracts from 20 shoots, regardless of whether single shoots were intact or excised during labeling. Single 5-day old primary roots exhibited polypeptide synthetic patterns and responded to heat shock in a manner similar to shoots. This is the 1st demonstration of the induction of heat-shock polypeptides in a whole, intact higher plant.

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