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  • Title: Zooming in on a quantitative trait for tomato yield using interspecific introgressions.
    Author: Fridman E, Carrari F, Liu YS, Fernie AR, Zamir D.
    Journal: Science; 2004 Sep 17; 305(5691):1786-9. PubMed ID: 15375271.
    Abstract:
    To explore natural biodiversity we developed and examined introgression lines (ILs) containing chromosome segments of wild species (Solanum pennellii) in the background of the cultivated tomato (S. lycopersicum). We identified Brix9-2-5, which is a S. pennellii quantitative trait locus (QTL) that increases sugar yield of tomatoes and was mapped within a flower- and fruit-specific invertase (LIN5). QTL analysis representing five different tomato species delimited the functional polymorphism of Brix9-2-5 to an amino acid near the catalytic site of the invertase crystal, affecting enzyme kinetics and fruit sink strength. These results underline the power of diverse ILs for high-resolution perspectives on complex phenotypes.
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