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Plant Physiol, June 2000, Vol. 123, pp. 563-574

AXR2 Encodes a Member of the Aux/IAA Protein Family1

Punita Nagpal, Loni M. Walker,2 Jeff C. Young, Ami Sonawala, Candace Timpte,3 Mark Estelle,4 and Jason W. Reed*

Department of Biology, University of North Carolina at Chapel Hill, CB #3280, Coker Hall, Chapel Hill, North Carolina 27599-3280 (P.N., A.S., J.W.R.); Department of Biology, Indiana University, Bloomington, Indiana 47405 (L.M.W., C.T., M.E.); and Department of Biology, Western Washington University, MS-9160, Bellingham, Washington 98225 (J.C.Y.)

The dominant gain-of-function axr2-1 mutation of Arabidopsis causes agravitropic root and shoot growth, a short hypocotyl and stem, and auxin-resistant root growth. We have cloned the AXR2 gene using a map-based approach, and find that it is the same as IAA7, a member of the IAA (indole-3-acetic acid) family of auxin-inducible genes. The axr2-1 mutation changes a single amino acid in conserved domain II of AXR2/IAA7. We isolated loss-of-function mutations in AXR2/IAA7 as intragenic suppressors of axr2-1 or in a screen for insertion mutations in IAA genes. A null mutant has a slightly longer hypocotyl than wild-type plants, indicating that AXR2/IAA7 controls development in light-grown seedlings, perhaps in concert with other gene products. Dark-grown axr2-1 mutant plants have short hypocotyls and make leaves, suggesting that activation of AXR2/IAA7 is sufficient to induce morphological responses normally elicited by light. Previously described semidominant mutations in two other Arabidopsis IAA genes cause some of the same phenotypes as axr2-1, but also cause distinct phenotypes. These results illustrate functional differences among members of the Arabidopsis IAA gene family.

1 This work was supported by the National Institutes of Health (grant nos. R29-GM52456 to J.W.R., R01-GM43644 to M.E., and post-doctoral fellowship GM16611 to L.M.W.).

2 Present address: Department of Biology, Illinois Wesleyan University, P.O. Box 2900, Bloomington, IL 61702-2900.

3 Present address: Department of Biological Science, University of New Orleans, New Orleans, LA 70148.

4 Present address: Institute for Cellular and Molecular Biology, Section of Molecular, Cellular, and Developmental Biology, University of Texas, Austin, TX 78712.

* Corresponding author; e-mail jreed{at}emailunc.edu; fax 919-962-1625.

© 2000 American Society of Plant Physiologists


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