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PLANT PHYSIOLOGY , Vol 104, Issue 2 777-784, Copyright © 1994 by American Society of Plant Biologists
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MOLECULAR BIOLOGY AND GENE REGULATION |
Characterization of the Auxin-Inducible SAUR-AC1 Gene for Use as a Molecular Genetic Tool in Arabidopsis
P. Gil, Y. Liu, V. Orbovic, E. Verkamp, K. L. Poff and P. J. Green
Michigan State University-Department of Energy Plant Research Laboratory, Michigan State University, East Lansing, Michigan 48824-1312
The small auxin up RNA (SAUR) genes were originally characterized in
soybean, where they encode a set of unstable transcripts that are rapidly
induced by auxin. In this report, the isolation of a SAUR gene, designated
SAUR-AC1, from Arabidopsis thaliana (L.) Heynh. ecotype Columbia is
described. The promoter of the SAUR-AC1 gene contains putative regulatory
motifs conserved among soybean SAUR promoters, as well as sequences
implicated in the regulation of other genes in response to auxin. The
transcribed region is approximately 500 bp in length and contains no
introns. Highly conserved sequences located within the SAUR-AC1 transcript
include the central portion of the coding region and a putative mRNA
instability sequence (DST) located in the 3[prime] untranslated region.
Accumulation of SAUR-AC1 mRNA is readily induced by natural and synthetic
auxins and by the translational inhibitor cycloheximide. Moreover, several
auxin- and gravity-response mutants of Arabidopsis exhibit decreased
accumulation of the SAUR-AC1 mRNA in elongating etiolated seedlings. In
particular, in the axr2-1 mutant the SAUR-AC1 transcript accumulates to
less than 5% of wild-type levels. These studies indicate that SAUR-AC1 will
be a useful probe of auxin-induced gene expression in Arabidopsis and will
facilitate the functional analysis of both transcriptional and
posttranscriptional regulatory elements.
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