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Science 19 April 1996:
Vol. 272. no. 5260, pp. 398 - 401
DOI: 10.1126/science.272.5260.398
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Reports

A Role for Brassinosteroids in Light-Dependent Development of Arabidopsis

Jianming Li, * Punita Nagpal, *dagger Veronique Vitart, ddagger Trevor C. McMorris, Joanne Chory §

Although steroid hormones are important for animal development, the physiological role of plant steroids is unknown. The Arabidopsis DET2 gene encodes a protein that shares significant sequence identity with mammalian steroid 5alpha -reductases. A mutation of glutamate 204, which is absolutely required for the activity of human steroid reductase, abolishes the in vivo activity of DET2 and leads to defects in light-regulated development that can be ameliorated by application of a plant steroid, brassinolide. Thus, DET2 may encode a reductase in the brassinolide biosynthetic pathway, and brassinosteroids may constitute a distinct class of phytohormones with an important role in light-regulated development of higher plants.

J. Li, P. Nagpal, V. Vitart, J. Chory, Plant Biology Laboratory, Salk Institute, La Jolla, CA 92037, USA.
T. C. McMorris, Department of Chemistry, University of California, San Diego, CA 92037, USA.
* These authors contributed equally to this study.
dagger Present address: Biology Department, University of North Carolina, Chapel Hill, NC 27599, USA.
ddagger Present address: Department of Cell Biology, The Scripps Research Institution, La Jolla, CA 92037, USA.
§ To whom correspondence should be addressed. E-mail: joanne_chory{at}qm.salk.edu


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A Putative Role for the Tomato Genes DUMPY and CURL-3 in Brassinosteroid Biosynthesis and Response.
C. V. Koka, R. E. Cerny, R. G. Gardner, T. Noguchi, S. Fujioka, S. Takatsuto, S. Yoshida, and S. D. Clouse (2000)
Plant Physiology 122, 85-98
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K. Schumacher, D. Vafeados, M. McCarthy, H. Sze, T. Wilkins, and J. Chory (1999)
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PNAS 96, 1761-1766
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wThe Arabidopsis dw f 7/ste1 Mutant Is Defective in the {Delta}7 Sterol C-5 Desaturation Step Leading to Brassinosteroid Biosynthesis.
S. Choe, T. Noguchi, S. Fujioka, S. Takatsuto, C. P. Tissier, B. D. Gregory, A. S. Ross, A. Tanaka, S. Yoshida, F. E. Tax, et al. (1999)
PLANT CELL 11, 207-222
   Abstract »    Full Text »
Regulation of differential growth in the apical hook of Arabidopsis.
V Raz and J. Ecker (1999)
Development 126, 3661-3668
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petit1, a Conditional Growth Mutant of Arabidopsis Defective in Sucrose-Dependent Elongation Growth.
T. Kurata and K. T. Yamamoto (1998)
Plant Physiology 118, 793-801
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Pleiotropic control of glucose and hormone responses by PRL1, a nuclear WD protein, in Arabidopsis.
K. Németh, K. Salchert, P. Putnoky, R. Bhalerao, Z. Koncz-Kálmán, B. Stankovic-Stangeland, L. Bakó, J. Mathur, L. Ökrész, S. Stabel, et al. (1998)
Genes & Dev. 12, 3059-3073
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The Arabidopsis DIMINUTO/DWARF1 Gene Encodes a Protein Involved in Steroid Synthesis.
U. Klahre, T. Noguchi, S. Fujioka, S. Takatsuto, T. Yokota, T. Nomura, S. Yoshida, and N.-H. Chua (1998)
PLANT CELL 10, 1677-1690
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Overexpression of an Arabidopsis cDNA Encoding a Sterol-C241-Methyltransferase in Tobacco Modifies the Ratio of 24-Methyl Cholesterol to Sitosterol and Is Associated with Growth Reduction.
H. Schaller, P. Bouvier-Navé, and P. Benveniste (1998)
Plant Physiology 118, 461-469
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The ROTUNDIFOLIA3 gene of Arabidopsis thaliana encodes a new member of the cytochrome P-450 family that is required for the regulated polar elongation of leaf cells.
G.-T. Kim, H. Tsukaya, and H. Uchimiya (1998)
Genes & Dev. 12, 2381-2391
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Isolation and Characterization of Arabidopsis Mutants Defective in the Induction of Ethylene Biosynthesis by Cytokinin.
J. P. Vogel, P. Schuerman, K. Woeste, I. Brandstatter, and J. J. Kieber (1998)
Genetics 149, 417-427
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Suppressors of an Arabidopsis thaliana phyB Mutation Identify Genes That Control Light Signaling and Hypocotyl Elongation.
J. W. Reed, R. P. Elumalai, and J. Chory (1998)
Genetics 148, 1295-1310
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An Arabidopsis Brassinosteroid-Dependent Mutant Is Blocked in Cell Elongation.
R. Azpiroz, Y. Wu, J. C. LoCascio, and K. A. Feldmann (1998)
PLANT CELL 10, 219-230
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The DWF4 Gene of Arabidopsis Encodes a Cytochrome P450 That Mediates Multiple 22{alpha}-Hydroxylation Steps in Brassinosteroid Biosynthesis.
S. Choe, B. P. Dilkes, S. Fujioka, S. Takatsuto, A. Sakurai, and K. A. Feldmann (1998)
PLANT CELL 10, 231-244
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Auxin Transport Is Required for Hypocotyl Elongation in Light-Grown but Not Dark-Grown Arabidopsis.
P. J. Jensen, R. P. Hangarter, and M. Estelle (1998)
Plant Physiology 116, 455-462
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The PASTICCINO genes of Arabidopsis thaliana are involved in the control of cell division and differentiation.
J. Faure, P Vittorioso, V Santoni, V Fraisier, E Prinsen, I Barlier, H Van Onckelen, M Caboche, and C Bellini (1998)
Development 125, 909-918
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