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MAX2 participates in an SCF complex which acts locally at the node to suppress shoot branching

Stirnberg, P., Furner, I.J. and Leyser, H.M.O. (2007) MAX2 participates in an SCF complex which acts locally at the node to suppress shoot branching. The Plant Journal, 50 (1). pp. 80-94. ISSN 0960-7412

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The Arabidopsis gene ORE9/MAX2 encodes an F-box leucine-rich repeat protein. F-box proteins function as the substrate-recruiting subunit of SCF-type ubiquitin E3 ligases in protein ubiquitination. One of several phenotypes of max2 mutants, the highly branched shoot, is identical to mutants at three other MAX loci. Reciprocal grafting, double mutant analysis and gene cloning suggest that all MAX genes act in a common pathway, where branching suppression depends on MAX2 activity in the shoot, in response to an acropetally mobile signal that requires MAX3, MAX4 and MAX1 for its production. Here, we further investigate the site and mode of action of MAX2 in branching. Transcript analysis and a translational MAX2–GUS fusion indicate that MAX2 is expressed throughout the plant, most highly in developing vasculature, and is nuclear-localized in many cell types. Analysis of cell autonomy shows that MAX2 acts locally, either in the axillary bud, or in adjacent stem or petiole tissue. Expression of MAX2 from the CaMV 35S promoter complements the max2 mutant, does not affect branching in a wild-type background and partially rescues increased branching in the max1, max3 and max4 backgrounds. Expression of mutant MAX2, lacking the F-box domain, under the CaMV 35S promoter does not complement max2, and dominant-negatively affects branching in the wild-type background. Myc-epitope-tagged MAX2 interacts with the core SCF subunits ASK1 and AtCUL1 in planta. We conclude that axillary shoot growth is controlled locally, at the node, by an SCFMAX2, the action of which is enhanced by the mobile MAX signal.

Item Type: Article
Copyright, Publisher and Additional Information: Open access copy available from the journal web site.
Keywords: axillary meristem, apical dominance, F-box protein, CAUT lines, ORE9
Institution: The University of York
Academic Units: The University of York > Biology (York)
Depositing User: Open Access From Journal
Date Deposited: 23 Dec 2008 13:45
Last Modified: 23 Dec 2008 13:45
Published Version: http://dx.doi.org/10.1111/j.1365-313X.2007.03032.x
Status: Published
Publisher: Wiley-Blackwell
Refereed: Yes
Identification Number: 10.1111/j.1365-313X.2007.03032.x
URI: http://eprints.whiterose.ac.uk/id/eprint/5053

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