The circadian clock. A plant's best friend in a spinning world1

From: Plant Physiology | Date: June 1, 2003| Author: | Copyright information

The circadian clock is an intricate, even delicate, regulator of plant physiology, yet at least one of the selective pressures that drove its evolution is brutally simple. Plants must be exposed to sunlight for photosynthesis, and sunlight is not available continuously. Therefore, plants are stuck with a day/night cycle of light and temperature, with the possible exceptions of buried, germinating seedlings and polar inhabitants. Each day's solar energy propels their metabolism into a spate of carbon fixation, which must end at nightfall. Locomotion would not alleviate the problem. Plants, ...

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