Gene expression during leaf development in Lolium temulentum: Patterns of protein synthesis in response to heat‐shock and cold‐shock

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At an optimal growth temperature of 20°C, expending 4th leaves of Lolium temulentum L. synthesised a broad spectrum of polypeptides which altered with the maturity of the leaf tissue. Elevation of the temperature to 35°C, or above, induced synthesis of heat‐shock proteins (hsp), and all parts of the 4th leaf were capable of this response. The threshold temperature for induction of hsp synthesis was little affected by the growth temperature (5 or 20°C). In contrast, a sudden 15–18°C decrease in temperature did not result in a marked alteration of protein synthesis patterns. It is concluded that in this species adaptation to rapid temperature reduction is not mediated by stress protein synthesis.