Identification of QTLs associated with citrus resistance to Phytophthora gummosis.
J Appl Genet
; 47(1): 23-8, 2006.
Article
en En
| MEDLINE
| ID: mdl-16424605
ABSTRACT
Citrus gummosis, caused by Phytophthora spp., is an important citrus disease in Brazil. Almost all citrus rootstock varieties are susceptible to it to some degree, whereas resistance is present in Poncirus trifoliata, a closely related species. The objective of this study was to detect QTLs linked to citrus Phytophthora gummosis resistance. Eighty individuals of the F1 progeny, obtained by controlled crosses between Sunki mandarin Citrus sunki (susceptible) and Poncirus trifoliata cv. Rubidoux (resistant), were evaluated. Resistance to Phytophthora parasitica was evaluated by inoculating stems of young plants with a disc of fungal mycelia and measuring lesion lengths a month later. Two QTLs linked to gummosis resistance were detected in linkage groups 1 and 5 of the P. trifoliata map, and one QTL in linkage group 2 of the C. sunki map. The phenotypic variation explained by individual QTLs was 14% for C. sunki and ranged from 16 to 24% for P. trifoliata. The low character heritability (h2 = 18.7%) and the detection of more than one QTL associated with citrus Phytophthora gummosis resistance showed that inheritance of the resistance is quantitative.
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Colección:
01-internacional
Base de datos:
MEDLINE
Asunto principal:
Phytophthora
/
Mapeo Cromosómico
/
Citrus
/
Genes de Plantas
/
Sitios de Carácter Cuantitativo
/
Inmunidad Innata
Tipo de estudio:
Diagnostic_studies
/
Prognostic_studies
/
Risk_factors_studies
Idioma:
En
Revista:
J Appl Genet
Asunto de la revista:
GENETICA
Año:
2006
Tipo del documento:
Article
País de afiliación:
Brasil