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Vol. 14, No. 10, pp. 1269-1278, May 15, 2000
1 Laboratory of Plant Molecular Biology, The Rockefeller
University, New York, New York 10021-6399 USA;
2 Max-Planck-Institut für Züchtungsforschung,
D-50829 Köln, Germany
Light signaling via the phytochrome A (phyA) photoreceptor controls
basic plant developmental processes including de-etiolation and
hypocotyl elongation. We have identified a new Arabidopsis mutant, pat (phytochrome A
signal transduction)1-1, which shows strongly
reduced responses in continuous far-red light. Physiological and
molecular data indicate that this mutant is disrupted at an early step
of phyA signal transduction. The PAT1 gene encodes a
cytoplasmic protein of 490 amino acids with sequence homologies to the
plant-specific GRAS regulatory protein family. In the pat1-1 mutant, a T-DNA insertion introduces a premature stop codon, which likely results in the production of a truncated PAT1 protein of 341 amino acids. The semidominant phenotype of this mutant can be
recapitulated by overexpression of an appropriately truncated PAT1 gene in the wild type. The results indicate that the
truncated PAT1 protein acts in a dominant-negative fashion to inhibit
phyA signaling.
[Key Words: Signal transduction; phytochrome A; far-red; Arabidopsis; GRAS proteins]
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