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Genetic and physiological characterization of tomato cv. Micro-Tom

Marti, Esmeralda, Gisbert, Carmina, Bishop, Gerard J., Dixon, Mark S. and Garcia-Martinez, Jose L. (2006) Genetic and physiological characterization of tomato cv. Micro-Tom Journal of Experimental Botany, 57, (9), pp. 2037-2047. (doi:10.1093/jxb/erj154).

Record type: Article


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.

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Published date: 10 May 2006
Keywords: brassinosteroids, cladosporium fulvum, dwarf, gibberellins, Micro-Tom, self-pruning, tomato
Organisations: Biological Sciences


Local EPrints ID: 40512
ISSN: 0022-0957
PURE UUID: 67c0b5bb-a8dd-415b-af7f-2c5280e7abdb

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Date deposited: 06 Jul 2006
Last modified: 17 Jul 2017 15:34

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Author: Esmeralda Marti
Author: Carmina Gisbert
Author: Gerard J. Bishop
Author: Mark S. Dixon
Author: Jose L. Garcia-Martinez

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