The plant photoreceptor phytochrome regulates many aspects of plant development. Not surprisingly, phytochrome gene expression is also carefully regulated. In most of the plant species that have been studied, type I phytochrome mRNA levels in etiolated seedlings are decreased after exposure of the seedlings to light. The dramatic decrease in type I phytochrome mRNA abundance in oat seedlings appears to be due to a combination of a phytochrome‐mediated decrease in transcription of the type I phytochrome gens coupled with the inherent instability of the type I phytochrome mRNA.
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James T. Colbert (1991) studied this question.
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