“…Molecular markers at the DNA level have allowed the construction of genetic linkage maps of forest species such as Eucalyptus (Grattapaglia and Sederoff 1994, Byrne et al 1995, Bundock et al 2000, Populus (Liu andFurnier 1993, Bradshaw et al 1994) and conifers , Sewell et al 2000, Kondo et al 2000, Li and Yeh 2001 as well as the localization of genomic regions that control economically important traits in these species (Groover et al 1994, Benet et al 1995, Bradshaw et al 1995, Grattapaglia et al 1995, Plomion 1995, Sewell et al 2000. 1International Paper do Brasil, Rodovia SP340, km171, C. P. 10, 13.840-970, Mogi Guaçu, SP, Brazil 2Laboratório de Bioquímica e de Biologia Molecular, UNESP, Via de Acesso Prof. Paulo Donato Castelane, Km 05, 14.884-900, Jaboticabal, SP, Brasil 3Cenagen, Embrapa, Av.…”