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THE PLANT CELL, Vol 5, Issue 9 1081-1088, Copyright © 1993 by American Society of Plant Biologists

RESEARCH ARTICLES

Arabidopsis HY8 Locus Encodes Phytochrome A

K. Dehesh, C. Franci, B. M. Parks, K. A. Seeley, T. W. Short, J. M. Tepperman and P. H. Quail
University of California-Berkeley/U.S. Department of Agriculture, Plant Gene Expression Center, 800 Buchanan Street, Albany, California 94710

hy8 long hypocotyl mutants of Arabidopsis defective in responsiveness to prolonged far-red light (the so-called "far-red high-irradiance response") are selectively deficient in functional phytochrome A. To define the molecular lesion in these mutants, we sequenced the phytochrome A gene (phyA) in lines carrying one or other of two classes of hy8 alleles. The hy8-1 and hy8-2 mutants that express no detectable phytochrome A each have a single nucleotide change that inserts a translational stop codon in the protein coding sequence. These results establish that phyA resides at the HY8 locus. The hy8-3 mutant that expresses wild-type levels of photochemically active phytochrome A has a glycine-to-glutamate missense mutation at residue 727 in the C-terminal domain of the phyA sequence. Quantitative fluence rate response analysis showed that the mutant phytochrome A molecule produced by hy8-3 exhibited no detectable regulatory activity above that of the phyA-protein-deficient hy8-2 mutant. This result indicates that glycine-727, which is invariant in all sequenced phytochromes, has a function important to the regulatory activity of phytochrome A but not to photoperception.


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