Abstract
SPECIFIC responses to blue light are found throughout the biological kingdom. These responses& mdash;which in higher plants include photo-tropism, inhibition of hypocotyl elongation, and stomatal opening1& mdash;are in many cases thought to be mediated by flavin-type photoreceptors2. But no such blue-light photoreceptor has yet been identified or isolated, although blue-light responses in plants were reported by Darwin over a century ago3, long before the discovery of the now relatively well characterized red/far-red light photoreceptor, phytochrome4. Here we describe the isolation of a gene corresponding to the HY4 locus of Arabidopsis thaliana. The hy4 mutant5 is one of several mutants6 that are selectively insensitive to blue light during the blue-light-dependent inhibition of hypocotyl elongation response, which suggests that they lack an essential component of the cryptochrome-associated light-sensing pathway. The HY4 gene, isolated by gene tagging, was shown to encode a protein with significant homology to microbial DNA photolyases. As photolyases are a rare class of flavoprotein that catalyse blue-light-dependent reactions7, the protein encoded by HY4 has a structure consistent with that of a flavin-type blue-light photoreceptor.
Similar content being viewed by others
References
Kaufman, L. S. Plant Physiol. 102, 333–337 (1993).
Galland, P. & Senger, H. in Photoreceptor Evolution and Function (ed. Holmes, M. G.) 65–124 (Academic, London, 1991).
Darwin, C. The Power of Movement in Plants (Appleton, New York, 1881).
Quail, P. H. A. Rev. Genet. 25, 389–409 (1991).
Koornneef, M., Rolff, E. & Spruit, C. J. P. Z. Pflanzenphysiol. Bd. 100, 147–160 (1980).
Liscum, E. & Hangarter, R. Plant Cell 3, 685–694 (1991).
Sancar, G. B. Mut. Res. 236, 147–160 (1990).
Feldmann, K. Plant J. 1, 71–82 (1991).
Schindler, U., Menkens, A. E., Beckmann, H., Ecker, J. R. & Cashmore, A. R. EMBO J. 11, 1261–1273 (1992).
Malhotra, K., Baer, M., Li, Y. F., Sancar, G. B. & Sancar, A. J. biol. Chem. 267, 2909–2914 (1992).
Yamamoto, K. Molec. gen. Genet. 232, 1–6 (1992).
Li, Y. F. & Sancar, A. Biochemistry 29, 5698–5706 (1990).
Kobayashi, T., Takao, M., Oikawa, A. & Yasui, A. Nucleic Acids Res. 17, 4731–4744 (1989).
Yajima, H., Inoue, H., Oikawa, A. & Yasui, A. Nucleic Acids Res. 19, 5359–5362 (1991).
Pang, Q. & Hays, J. B. Plant Physiol. 95, 536–543 (1991).
Ruiz-Apazo, N. & Nadal-Ginard, B. J. biol. Chem. 262, 4755–4765 (1987).
Reymond, P., Short, T. W., Briggs, W. R. & Poff, K. L. Proc. natn. Acad. Sci. U.S.A. 89, 4718–4721 (1992).
Murashige, T. & Skoog, F. Physiol. Plant 15, 473–476 (1962).
Maniatis, T., Fritsch, E. F. & Sambrook, J. Molecular Cloning: A Laboratory Manual (Cold Spring Harbor Laboratory Press, New York, 1982).
Ausubel, F. M. et al. Current Protocols in Molecular Biology (Greene Wiley-Interscience, 1989).
Sanger, F., Nicklen, S. & Coulson, A. R. Proc. natn. Acad. Sci. U.S.A. 74, 5463–5467 (1977).
Yasuhira, S. & Yasui, A. J. biol. Chem. 267, 25644–25647 (1992).
Higgins, D. G. & Sharp, P. M. CABIOS 5, 151–153 (1989).
Author information
Authors and Affiliations
Rights and permissions
About this article
Cite this article
Ahmad, M., Cashmore, A. HY4 gene of A. thaliana encodes a protein with characteristics of a blue-light photoreceptor. Nature 366, 162–166 (1993). https://doi.org/10.1038/366162a0
Received:
Accepted:
Issue Date:
DOI: https://doi.org/10.1038/366162a0
- Springer Nature Limited
This article is cited by
-
CRY2 gene of rice (Oryza sativa subsp. indica) encodes a blue light sensory receptor involved in regulating flowering, plant height and partial photomorphogenesis in dark
Plant Cell Reports (2023)
-
Cryptochrome 1 Ubiquitously Regulates Hypocotyl Elongation from Arabidopsis to Sacred Lotus (Nelumbo nucifera)
Journal of Plant Growth Regulation (2023)
-
Comprehensive identification and expression analysis of CRY gene family in Gossypium
BMC Genomics (2022)
-
Midnight/midday-synchronized expression of cryptochrome genes in the eyes of three teleost species, zebrafish, goldfish, and medaka
Zoological Letters (2022)
-
CRY2 interacts with CIS1 to regulate thermosensory flowering via FLM alternative splicing
Nature Communications (2022)