Genetic structuring of segregating populations of Psidium spp resistant to the southern root-knot nematode by Bayesian approach as basis for the guava breeding program
Document title: Genetic structuring of segregating populations of Psidium spp resistant to the southern root-knot nematode by Bayesian approach as basis for the guava breeding program
Journal: Anais da Academia Brasileira de Ciencias
Database: PERIÓDICA
System number: 000435926
ISSN: 0001-3765
Authors: 1
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Institutions: 1Universidade Estadual do Norte Fluminense, Centro de Ciencias Tecnologias Agropecuarias, Campos dos Goytacazes, Rio de Janeiro. Brasil
Year:
Volumen: 92
Number: 3
Country: Brasil
Language: Inglés
Document type: Artículo
Approach: Analítico, descriptivo
English abstract There are no guava cultivars resistant to the Meloidogyne enterolobii; for this reason, genetic breeding has been performed by introgressing genes into the current cultivars through interspecific hybridization. We used 33 microsatellite markers for the genetic-molecular characterization of segregating populations of Psidium resistant to M. enterolobii, aiming at selection within and between populations for generation advancement in the guava breeding program. The average number of alleles per locus ranged from 1.60 to 2.09. Populations 1 (P. guineense × P. cattleyanum) and 5 (P. guajava × P. cattleyanum) obtained the greatest genetic diversity, which can be confirmed by the higher observed-heterozygosity values (0.422 and 0.312, respectively). Bayesian analysis showed that the populations were subdivided into three groups, agreeing with the number of groups observed by Nei’s genetic distance. The population obtained from the P. guineense × P. cattleyanum cross differed from the others with a clear structuring, whereas the P. guajava × P. cattleyanum and P. cattleyanum × P. guineense populations were the most similar between each other. The SSR markers were efficient in discriminating the populations, and individual 80 may be employed in future crosses with guava, allowing generation advancement in the guava breeding program aimed at resistance to M. enterolobii
Disciplines: Agrociencias
Keyword: Frutales,
Fitotecnia,
Fitopatología,
Guayaba,
Mejoramiento genético,
Resistencia a plagas,
Hibridación interespecífica,
Marcadores de ADN,
Diversidad genética,
Psidium guajava,
Myrtaceae,
Meloidogyne enterolobii
Keyword: Fruit trees,
Crop husbandry,
Phytopathology,
Guava,
Genetic improvement,
Pests resistance,
Interspecific hybridization,
DNA markers,
Genetic diversity,
Psidium guajava,
Myrtaceae,
Meloidogyne enterolobii
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