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Abstract
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Arabidopsis HY8 locus encodes phytochrome A.

K Dehesh, C Franci, B M Parks, K A Seeley, T W Short, J M Tepperman, P H Quail
K Dehesh
University of California-Berkeley/U.S. Department of Agriculture, Albany 94710.
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C Franci
University of California-Berkeley/U.S. Department of Agriculture, Albany 94710.
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B M Parks
University of California-Berkeley/U.S. Department of Agriculture, Albany 94710.
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K A Seeley
University of California-Berkeley/U.S. Department of Agriculture, Albany 94710.
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T W Short
University of California-Berkeley/U.S. Department of Agriculture, Albany 94710.
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J M Tepperman
University of California-Berkeley/U.S. Department of Agriculture, Albany 94710.
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P H Quail
University of California-Berkeley/U.S. Department of Agriculture, Albany 94710.
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Published September 1993. DOI: https://doi.org/10.1105/tpc.5.9.1081

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Abstract

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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Arabidopsis HY8 locus encodes phytochrome A.
K Dehesh, C Franci, B M Parks, K A Seeley, T W Short, J M Tepperman, P H Quail
The Plant Cell Sep 1993, 5 (9) 1081-1088; DOI: 10.1105/tpc.5.9.1081

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Arabidopsis HY8 locus encodes phytochrome A.
K Dehesh, C Franci, B M Parks, K A Seeley, T W Short, J M Tepperman, P H Quail
The Plant Cell Sep 1993, 5 (9) 1081-1088; DOI: 10.1105/tpc.5.9.1081
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Vol. 5, Issue 9
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