title: Combining abilities for agronomic traits and marker-assisted selection for Potato virus X and Potato virus Y resistance.
abstract: Disease-resistant potato cultivars with good tuber appearance and desirable agronomic traits are essential for meeting the demands of producers and the market. Attaining these cultivars is the focus of potato breeding programs whose aim is to benefit the productive chain. The purpose of this study was to estimate combining abilities and evaluate potato clones based on tuber appearance, yield, and resistance to the PVY and PVX viruses. Crosses between four commercial cultivars of potato with good tuber appearance were performed, using eight clones with proven resistance to PVY and PVX from the breeding program of UFLA. The clones obtained were evaluated for agronomic traits, tuber appearance, and the presence of both Ryadgand Rx1 alleles, which confer extreme resistance to the PVY and PVX viruses, respectively. The independent culling level method was used to select genotypes of commercial interest, as well as to estimate the combining abilities of the parents. We identified clones carrying the Ryadgand Rx1 alleles with agronomic traits suitable for the fresh market and for processing. The BRS Ana cultivar and CMA-399 and CMA-385 clones showed positive effects on general combining ability (GCA) for tuber yield, while the Monalisa cultivar showed positive effects on GCA for general tuber appearance.
authors.affiliation: Departamento de Biologia, Universidade Federal de Lavras, Lavras, MG, Brasil marcioguedesbio@gmail.com.
authors.forename: M L
authors.initials: ML
authors.lastname: Guedes
authors.affiliation: Departamento de Biologia, Universidade Federal de Lavras, Lavras, MG, Brasil.
authors.forename: C A B P
authors.initials: CA
authors.lastname: Pinto
authors.affiliation: Departamento de Biologia, Universidade Federal de Lavras, Lavras, MG, Brasil.
authors.forename: G H M R
authors.initials: GH
authors.lastname: Ribeiro
authors.affiliation: Departamento de Genética, Escola Superior de Agricultura "Luiz de Queiroz", Universidade de São Paulo, Piracicaba, SP, Brasil.
authors.forename: D H
authors.initials: DH
authors.lastname: Lyra
authors.affiliation: Departamento de Genética, Escola Superior de Agricultura "Luiz de Queiroz", Universidade de São Paulo, Piracicaba, SP, Brasil.
authors.forename: O L G
authors.initials: OL
authors.lastname: Carneiro
mesh_terms: D000483:Alleles; D001947:Breeding; D003433:Crosses, Genetic; D060467:Disease Resistance / Q000235:genetics; D005838:Genotype; D007113:Immunity, Innate / Q000235:genetics; D010641:Phenotype; D010935:Plant Diseases / Q000235:genetics* / Q000821:virology; D017863:Potexvirus / Q000235:genetics* / Q000472:pathogenicity; D017800:Potyvirus / Q000235:genetics* / Q000472:pathogenicity; D011198:Solanum tuberosum / Q000235:genetics* / Q000821:virology