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JXB Advance Access originally published online on May 10, 2006
Journal of Experimental Botany 2006 57(9):2037-2047; doi:10.1093/jxb/erj154
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© The Author [2006]. Published by Oxford University Press [on behalf of the Society for Experimental Biology]. All rights reserved.
The online version of this article has been published under an Open Access model. Users are entitled to use, reproduce, disseminate, or display the Open Access version of this article for non-commercial purposes provided that: the original authorship is properly and fully attributed; the Journal and the Society for Experimental Biology are attributed as the original place of publication with the correct citation details given; if an article is subsequently reproduced or disseminated not in its entirety but only in part or as a derivative work this must be clearly indicated. For commercial re-use, please contact: journals.permissions@oxfordjournals.orgThis paper is available online free of all access charges (see http://jxb.oxfordjournals.org/open_access.html for further details)

RESEARCH PAPER

Genetic and physiological characterization of tomato cv. Micro-Tom

Esmeralda Martí1, Carmina Gisbert1 *, Gerard J. Bishop2, Mark S. Dixon3 and José L. García-Martínez1,{dagger}

1Instituto de Biología Molecular y Celular de Plantas (IBMCP), Universidad Politécnica de Valencia-CSIC, Avda de los Naranjos s/n, 46022-Valencia, Spain
2Division of Biology, Imperial College London, Wye Campus, Ashford, Kent TN25 5AH, UK
3School of Biological Sciences, University of Southampton, Southampton SO16 7PX, UK

{dagger}To whom correspondence should be addressed. E-mail: jlgarcim{at}ibmcp.upv.es

Based on its compact habit, Micro-Tom, a dwarf cultivar of tomato (Solanum lycopersicum L.), has been proposed as a preferred variety to carry out molecular research in tomato. This cultivar, however, is poorly characterized. It is shown here that Micro-Tom has mutations in the SELF-PRUNING (SP) and DWARF (D) genes. In addition to this, it is also shown that Micro-Tom harbours at least two independently segregating resistance loci to the plant pathogen Cladosporium fulvum. The presence of the self-pruning mutation in Micro-Tom, that generates a determinate phenotype, was confirmed by crossing and sequence analysis. It was also found that Micro-Tom has a mutation in the DWARF gene (d) that leads to mis-splicing and production of at least two shorter mRNAs. The d mutation is predicted to generate truncated DWARF protein. The d sequence defect co-segregates with dark-green and rugose leaves, characteristics of brassinosteroid biosynthesis mutants. Micro-Tom also carries at least another mutation producing internode length reduction that affects plant height but not active gibberellin (GA) levels, which were similar in dwarf and tall Micro-TomxSeverianin segregants. GAs and brassinosteroids act synergistically in Micro-Tom, and the response to GA depends on brassinosteroids because the elongation of internodes was at least six times higher when GA3 was applied simultaneously with brassinolide. A novel variety, Micro-0 that is fully susceptible to C. fulvum and almost as dwarf as Micro-Tom, has been generated from the cross of Cf0xMicro-Tom. This line represents a valuable resource for future analysis of Cf resistance genes through breeding or transformation.

Key words: Brassinosteroids, Cladosporium fulvum, Dwarf, gibberellins, Micro-Tom, Self-Pruning, tomato


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