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Plant Cell, Vol. 11, 365-376, March 1999, Copyright © 1999, American Society of Plant Physiologists

IAR3 Encodes an Auxin Conjugate Hydrolase from Arabidopsis

Rosie T. Daviesa, David H. Goetza, Jamie Lasswella, Mindy N. Andersona, and Bonnie Bartela
a Department of Biochemistry and Cell Biology, Rice University, Houston, Texas 77005-1892

Correspondence to: Bonnie Bartel, bartel{at}bioc.rice.edu (E-mail), 713-285-5154 (fax)

Amide-linked conjugates of indole-3-acetic acid (IAA) are putative storage or inactivation forms of the growth hormone auxin. Here, we describe the Arabidopsis iar3 mutant that displays reduced sensitivity to IAA–Ala. IAR3 is a member of a family of Arabidopsis genes related to the previously isolated ILR1 gene, which encodes an IAA–amino acid hydrolase selective for IAA–Leu and IAA–Phe. IAR3 and the very similar ILL5 gene are closely linked on chromosome 1 and comprise a subfamily of the six Arabidopsis IAA-conjugate hydrolases. The purified IAR3 enzyme hydrolyzes IAA–Ala in vitro. iar 3 ilr1 double mutants are more resistant than either single mutant to IAA–amino acid conjugates, and plants overexpressing IAR3 or ILR1 are more sensitive than is the wild type to certain IAA–amino acid conjugates, reflecting the overlapping substrate specificities of the corresponding enzymes. The IAR3 gene is expressed most strongly in roots, stems, and flowers, suggesting roles for IAA-conjugate hydrolysis in those tissues.




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