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Plant Physiology 134:101-117 (2004)
© 2004 American Society of Plant Biologists

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DEVELOPMENT AND HORMONE ACTION

The ULTRACURVATA2 Gene of Arabidopsis Encodes an FK506-Binding Protein Involved in Auxin and Brassinosteroid Signaling1

José Manuel Pérez-Pérez, María Rosa Ponce and José Luis Micol*

División de Genética and Instituto de Bioingeniería, Universidad Miguel Hernández, Campus de Elche, 03202 Elche, Alicante, Spain

The dwarf ucu (ultracurvata) mutants of Arabidopsis display vegetative leaves that are spirally rolled downwards and show reduced expansion along the longitudinal axis. We have previously determined that the UCU1 gene encodes a SHAGGY/GSK3-like kinase that participates in the signaling pathways of auxins and brassinosteroids. Here, we describe four recessive alleles of the UCU2 gene, whose homozygotes display helical rotation of several organs in addition to other phenotypic traits shared with ucu1 mutants. Following a map-based strategy, we identified the UCU2 gene, which was found to encode a peptidyl-prolyl cis/trans-isomerase of the FK506-binding protein family, whose homologs in metazoans are involved in cell signaling and protein trafficking. Physiological and double mutant analyses suggest that UCU2 is required for growth and development and participates in auxin and brassinosteroid signaling.

Article, publication date, and citation information can be found at http://www.plantphysiol.org/cgi/doi/10.1104/pp.103.032524.

1 This work was supported by the Ministerio de Educación y Cultura and the Ministerio de Ciencia y Tecnología of Spain (grant nos. PB98-1389 and BMC2002-02840) and by the Conselleria de Cultura, Educació i Ciència of the Generalitat Valenciana (fellowship to J.M.P.-P.).

* Corresponding author; e-mail jlmicol{at}umh.es; fax 34-96-665-85-11.

Received September 1, 2003; returned for revision September 29, 2003; accepted September 29, 2003.




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