期刊
JOURNAL OF PLANT PHYSIOLOGY
卷 167, 期 14, 页码 1188-1196出版社
ELSEVIER GMBH
DOI: 10.1016/j.jplph.2010.03.019
关键词
Arabidopsis; Auxin; Gibberellins; Gene promoter; Solanum tuberosum
资金
- Ministerio de Educacion y Ciencia of Spain [BIO2003-00151, BIO2006-13437]
- Conselleria de Agricultura de la Generalitat Valenciana
Gibberellin 20-oxidases, enzymes of gibberellin (GA) biosynthesis, play an important role in (GA) homeostasis. To investigate the regulation of tomato SIGA20ox1 expression, a genomic clone was isolated, its promoter transcriptionally fused to the GUS reporter gene, and the construct used to transform Arabidopsis. Expression was found in diverse vegetative (leaves and roots) and reproductive (flowers) organs. GUS staining was also localized in the columella of secondary roots. GA negative feed-back regulation of SIGA20ox1 :GUS was shown to be active both in tomato and in transformed Arabidopsis. Auxin (indol-3-acetic acid, 2,4-dichlorophenoxyacetic acid and naphtaleneacetic acid), triiodobenzoic acid (an inhibitor of auxin transport) and benzyladenine (a cytokinin) treatment induced SIGA20ox1 :GUS expression associated with increased auxin content and/or signaling, detected using DR5:GUS expression as a marker. Interestingly, SIGA20ox:GUS expression was induced by auxin and root excision in the hypocotyl, an organ not showing GUS staining in control seedlings. In etiolated seedlings, SIGA200x1 :GUS expression occurred in the elongating hypocotyl region of etiolated seedlings and was down-regulated upon transfer to light associated with decrease of growth rate elongation. Our results show that feed-back, auxin and light regulation of SIGA20ox1 expression depends on DNA elements contained within the first 834 bp of the 5' upstream promoter region. Putative DNA regulatory sequences involved in negative feed-back regulation and auxin response were identified in that promoter. (C) 2010 Elsevier GmbH. All rights reserved.
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