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PLANT PHYSIOLOGY , Vol 115, Issue 3 959-969, Copyright © 1997 by American Society of Plant Biologists

GENE REGULATION AND MOLECULAR GENETICS

Differential Patterns of Expression of the Arabidopsis PHYB, PHYD, and PHYE Phytochrome Genes

L. Goosey, L. Palecanda and R. A. Sharrock
Department of Biology, 310 Lewis Hall, Montana State University, Bozeman, Montana 59717

The Arabidopsis thaliana phyB, phyD, and phyE phytochrome apoproteins show higher amino acid sequence similarity to each other than to phyA or phyC, they are the most recently evolved members of this photoreceptor family, and they may interact in regulating photomorphogenesis. The expression patterns of translational fusions of the 5[prime] upstream regions of the PHYB, PHYD, and PHYE genes to the [beta]-glucuronidase (GUS) coding sequence were compared. PD-GUS and PE-GUS fusions were 5- to 10-fold less active than a PB-GUS fusion, but all three promoter regions drove expression of the reporter gene in all stages of the plant's life cycle. Over the first 10 d of seedling growth, the PHYB and PHYD promoters were more active in the dark than in the light, whereas the opposite was true of the PHYE promoter. Unlike the PB-GUS construct, which was expressed in most parts of seedlings and mature plants, the PD-GUS and PE-GUS transgenes showed differential expression, notably in leaves, flower organs, and root tips. Tissue sections showed that the three promoters are coexpressed in at least some leaf cells. Hence, the PHYB, PHYD, and PHYE genes differ in expression pattern but these patterns overlap and interaction of these receptor forms within individual cells is possible.


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