Inheritance study and linkage mapping of resistance loci to Hemileia vastatrix in Híbrido de Timor UFV 443-03

• Autor(a) principal: Pestana, Kátia Nogueira
• Data de Publicação: 2015
• Outros Autores: Capucho, Alexandre Sandri, Caixeta, Eveline Teixeira, Almeida, Dênia Pires de, Zambolim, Eunize Maciel, Cruz, Cosme Damião, Zambolim, Laércio, Pereira, Antônio Alves, Oliveira, Antonio Carlos Baião de, Sakiyama, Ney Sussumu
• Tipo de documento: Artigo
• Idioma: eng
• Título da fonte: LOCUS Repositório Institucional da UFV
• Texto Completo: http://dx.doi.org/10.1007/s11295-015-0903-9; http://www.locus.ufv.br/handle/123456789/21491
• topic: Coffee; Leaf rust; Breeding; MAS; Linkage map; QTL

Coffee leaf rust (CLR) caused by Hemileia vastatrix Berk. et Br. is one of the major Coffea arabica diseases worldwide. CLR resistance has been attributed to at least nine dominant genes, as single or in combination. We present an inheritance study and mapping loci involved in the Híbrido de Timor (HDT) UFV 443-03 resistance to race I, race II, and pathotype 001 of H. vastatrix. Molecular markers were used to ascertain the phenotypic results and to map the putative resistance loci. For all tree isolates, the inheritance study indicated that the resistance of HDT UFV 443-03 is conditioned by two independent dominant loci or by three independent loci (two dominant and one recessive). Molecular marker analyses ascertained that the resistance of HDT UFV 443-03 to race II is conditioned by at least two independent dominant loci, while the resistance to race I and pathotype 001 is conditioned by at least four independent dominant loci. Gene pyramiding might result in a cultivar with durable resistance; however, it is difficult to distinguish between plants with one or more resistance genes due to epistatic effects. Molecular markers linked to these genes were indicated for marker-assisted selection, as it is an efficient breeding alternative for CLR resistance with no such epistatic effects.