Understanding structure and evolution of genomic regions coding for proteins of agronomical interest is an important objective for crop improvement. We compare hom(oe)ologous regions within monocot genomes through BAC annotation. Here, we present putative orthologous and paralogous relationships of a highly duplicated Resistance Gene Analog (RGA) locus within Musa species and between Musa and rice species. (Résumé d'auteur