In tomato, many important traits are under mono-genic control (e.g., disease resistance, fruit color, shelf life, determinate growth). Molecular markers have been used to map and characterize these loci for decades and are frequently used by breeders for rapid screening of disease resistance genes. The availability of saturated molecular genetic maps of tomato has facilitated QTL mapping for traits related to fruit characteristics and yield, and for adaptation to abi otic stresses. Tomato is among the first plant species for which QTLs were detected (Paterson et al. 1988; Tanksley 1993b).
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