JXB Advance Access originally published online on July 16, 2004
Journal of Experimental Botany 2004 55(403):1671-1685; doi:10.1093/jxb/erh207
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RESEARCH PAPER |
A genetic map of candidate genes and QTLs involved in tomato fruit size and composition
1INRA Unité de Génétique et Amélioration des Fruits et Légumes, BP 94, F-84143 Montfavet Cedex, France
2INRA, UMR Sécurité et Qualité des Produits d'Origine Végétale, Domaine Saint- Paul, F-84914 Avignon Cedex 9, France
3Hebrew University of Jerusalem, Faculty of Agriculture, Department of Field, Vegetable Crops and Genetics, Israel
4UMR619 Physiologie et Biotechnologie Végétales IBVM, INRA Bordeaux, BP 81, F-33883 Villenave d'Ornon Cedex, France
* To whom correspondence should be addressed. Fax: +33 4 32 72 27 02. E-mail: mathilde.causse{at}avignon.inra.fr
In order to screen for putative candidate genes linked to tomato fruit weight and to sugar or acid content, genes and QTLs involved in fruit size and composition were mapped. Genes were selected among EST clones in the TIGR tomato EST database (http://www.tigr.org/tdb/tgi/lgi/) or corresponded to genes preferentially expressed in the early stages of fruit development. These clones were located on the tomato map using a population of introgression lines (ILs) having one segment of Lycopersicon pennellii (LA716) in a L. esculentum (M82) background. The 75 ILs allowed the genome to be segmented into 107 bins. Sixty-three genes involved in carbon metabolism revealed 79 loci. They represented enzymes involved in the Calvin cycle, glycolysis, the TCA cycle, sugar and starch metabolism, transport, and a few other functions. In addition, seven cell-cycle-specific genes mapped into nine loci. Fourteen genes, primarily expressed during the cell division stage, and 23 genes primarily expressed during the cell expansion stage, revealed 24 and 26 loci, respectively. The fruit weight, sugars, and organic acids content of each IL was measured and several QTLs controlling these traits were mapped. Comparison between map location of QTLs and candidate gene loci indicated a few candidate genes that may influence the variation of sugar or acid contents. Furthermore, the gene/QTL locations could be compared with the loci mapped in other tomato populations.
Key words: Candidate genes, carbon metabolism, fruit development, genetic map, Lycopersicon esculentum, Quantitative Trait Locus
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