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THE PLANT CELL, Vol 4, Issue 1 29-38, Copyright © 1992 by American Society of Plant Biologists
Red Light-Independent Instability of Oat Phytochrome mRNA in Vivo
K. A. Seeley, D. H. Byrne and J. T. Colbert
Department of Botany, Iowa State University, Ames, Iowa 50011
Phytochrome A (phyA) mRNA abundance decreased rapidly in total RNA samples
isolated from 4-day-old etiolated oat seedlings following a red light
pulse. Putative in vivo phyA mRNA degradation products were detectable both
before and after red light treatment. Cordycepin-treated coleoptiles were
unable to accumulate the chlorophyll a/b-binding protein mRNA in response
to red light, indicating that cordycepin effectively inhibited mRNA
synthesis. In cordycepin-treated coleoptiles, phyA mRNA rapidly decreased
in abundance, consistent with the hypothesis that phyA mRNA is inherently
unstable, rather than being destabilized after red light treatment of
etiolated oat seedlings.
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