Tomato quality is a complex character due to its number of components and because it is dependent on conditions throughout the entire process of plant and fruit development. Genetic variation for fruit quality is extensive, especially if one considers the possibilities offered by wild tomato species. A few mutations have been shown to be involved in fruit quality, particularly in ripening, and QTL studies have revealed anumberofgenomic regionsinvolvedinthe variation of quality traits. Several genomic hot-spots for fruit quality QTLs have been identified. These clusters of QTLs for several quality traits may permit simultaneous MAS for multiple traits. Very few QTLs have been identified at the molecular level, but one can expect a rapid increase in the number of genes identified in the near future, thanks to systems biology approaches combining transcriptomics, proteomics
and metabolomics studies and the information from the tomato genome sequence (Fig. 10). These discoveries will greatly facilitate breeding for improved fruit quality.
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