Abstract
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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