Comparative QTL

There are several examples of successful comparative QTL mapping in the Solanaceae. Much of the comparative QTL mapping has been done with fruit

Fig. 6. Determination of marker orthology by map position. In this example, CD422 is located between TG766 and TG922 in the tomato genome. CD422 hybridizes to two fragments in the pepper genome that map to different loci. CD422b in pepper is designated orthologous to CD422 in tomato due to its similar map position. CD422a is paralogous

Fig. 6. Determination of marker orthology by map position. In this example, CD422 is located between TG766 and TG922 in the tomato genome. CD422 hybridizes to two fragments in the pepper genome that map to different loci. CD422b in pepper is designated orthologous to CD422 in tomato due to its similar map position. CD422a is paralogous weight and shape characters (Doganlar et al. 2002b; Ben-Chaim et al. 2003; Frary et al. 2003a). Putative or-thologous QTLs/genes controlling those phenotypes have been found in tomato, potato, pepper, and eggplant (Table 10). Most of the rest of the comparative QTL/gene mapping has been done on disease resistance loci. Orthologous QTLs have been found for oomycete, fungal, viral, and nematode disease resistances. Indeed, it seems that resistance gene clusters might be the rule rather than the exception (Table 10).

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