THE PLANT CELL, Vol 2, Issue 11 1071-1080, Copyright © 1990 by American Society of Plant Biologists

RESEARCH ARTICLES

Growth and Development of the axr1 Mutants of Arabidopsis

C. Lincoln, J. H. Britton and M. Estelle
Department of Biology, Indiana University, Bloomington, Indiana 47405

We have recovered eight new auxin-resistant lines of Arabidopsis that carry mutations in the AXR1 gene. These eight lines, together with the 12 lines described in a previous report, define at least five different axr1 alleles. All of the mutant lines have a similar phenotype. Defects include decreases in plant height, root gravitropism, hypocotyl elongation, and fertility. Mutant line axr1-3 is less resistant to auxin than the other mutant lines and has less severe morphological abnormalities. This correlation suggests that the morphological defects are a consequence of a defect in auxin action. To determine whether the altered morphology of mutant plants is associated with changes in cell size or tissue organization, tissue sections were examined using scanning electron microscopy. No clear differences in cell size were observed between wild-type and mutant tissues. However, the vascular bundles of mutant stems were found to be less well differentiated than those in wild-type stems. The auxin sensitivity of rosette-stage plants was determined by spraying plants with auxin solutions. Mutant rosettes were found to be significantly less sensitive to exogenously applied auxin than wild-type rosettes, indicating that the AXR1 gene functions in aerial portions of the plant. Our studies suggest that the AXR1 gene is required for auxin action in most, if not all, tissues of the plant and plays an important role in plant development. Linkage studies indicate that the gene is located on chromosome 1 approximately 2 centiMorgans from the closest restriction fragment length polymorphism.

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				S. Bak and R. Feyereisen The Involvement of Two P450 Enzymes, CYP83B1 and CYP83A1, in Auxin Homeostasis and Glucosinolate Biosynthesis Plant Physiology, September 1, 2001; 127(1): 108 - 118. [Abstract] [Full Text] [PDF]

				L. C. Williamson, S. P.C.P. Ribrioux, A. H. Fitter, and H.M. O. Leyser Phosphate Availability Regulates Root System Architecture in Arabidopsis Plant Physiology, June 1, 2001; 126(2): 875 - 882. [Abstract] [Full Text] [PDF]

				A. Rahman, A. Ahamed, T. Amakawa, N. Goto, and S. Tsurumi Chromosaponin I Specifically Interacts with AUX1 Protein in Regulating the Gravitropic Response of Arabidopsis Roots Plant Physiology, February 1, 2001; 125(2): 990 - 1000. [Abstract] [Full Text]

				S. Bak, F. E. Tax, K. A. Feldmann, D. W. Galbraith, and R. Feyereisen CYP83B1, a Cytochrome P450 at the Metabolic Branch Point in Auxin and Indole Glucosinolate Biosynthesis in Arabidopsis PLANT CELL, January 1, 2001; 13(1): 101 - 111. [Abstract] [Full Text]

				C. Lu and N. Fedoroff A Mutation in the Arabidopsis HYL1 Gene Encoding a dsRNA Binding Protein Affects Responses to Abscisic Acid, Auxin, and Cytokinin PLANT CELL, December 1, 2000; 12(12): 2351 - 2366. [Abstract] [Full Text]

				S. Ramachandran, H. E.M. Christensen, Y. Ishimaru, C.-H. Dong, W. Chao-Ming, A. L. Cleary, and N.-H. Chua Profilin Plays a Role in Cell Elongation, Cell Shape Maintenance, and Flowering in Arabidopsis Plant Physiology, December 1, 2000; 124(4): 1637 - 1647. [Abstract] [Full Text]

				C. E. Collett, N. P. Harberd, and O. Leyser Hormonal Interactions in the Control of Arabidopsis Hypocotyl Elongation Plant Physiology, October 1, 2000; 124(2): 553 - 562. [Abstract] [Full Text]