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In the leaves of plants that are grown in the natural environment, the accumulation of mRNAs encoding the chlorophyll a/b binding proteins (CAB) follow a circadian rhythm. It is generally accepted that the day/night (sunset, light/dark) or night/day (sunrise, dark/light) transitions play an important role in the synchronization of the rhythm and the determination of the accumulation amplitude. As the results of the experiments presented in this paper indicate, temperature alterations also support the setting and the arrangement of the rhythm. Apparently, simulating "day/night" temperature alternations influences the tomato (Lycopersicon esculentum) plants to express a typical circadian oscillation pattern of cab mRNAs. This rhythm was sustained in the plants after long-term exposure to an alternating temperature regime. In constant conditions, e.g. continuous illumination at either 18 degrees C or 24 degrees C or in continuous darkness at 24 degrees C, this diurnal fluctuation pattern with a period of about 24 hours remained present for at least 2 days.

Effect of Temperature Alterations on the Diurnal Expression Pattern of the Chlorophyll a/b Binding Proteins in Tomato Seedlings