Abstract
Publisher Summary Light is important for plant development and the expression of a large number of genes is regulated by light. The quality, amount, and duration of the light treatment needed to induce or repress the expression of a gene of interest provide information about the way light controls its expression. The phytochromes are the best studied family of photoreceptors. Phytochrome can function as a molecular switch because many responses that are triggered by a pulse of red light can be reduced when the plant is subsequently exposed to far-red light. To determine the role of phytochrome in the light-regulated expression of the gene of interest, red and far-red light source are required. A red light source can be obtained by filtering the red light portion from an incandescent bulb with filters such as those used in photography. Moreover, several types of red-light bulbs and fluorescent tubes are also commercially available and their use is much preferred.
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