Inheritance of acylsugar contents in tomatoes derived from an interspecific cross with the wild tomato Lycopersicon pennellii and their effect on spider mite repellence
Genet. mol. res. (Online)
; 1(2): 106-116, Jun. 2002.
Article
en En
| LILACS
| ID: lil-417646
Biblioteca responsable:
BR1.1
ABSTRACT
Acylsugars present in Lycopersicon pennellii are responsible for the high levels of pest resistance often found in this wild tomato taxon. We investigated the inheritance of acylsugar contents in segregating populations of the interspecific tomato cross L. esculentum x L. pennellii and estimated correlations between leaflet acylsugar contents and the levels of mite repellence. Acylsugar contents were quantified with the Sommogy-Nelson colorimetric method in the acessions L. esculentum 'TOM-584' (P(1), low acylsugars), L. pennellii 'LA-716' (P(2), high acylsugars), in the interspecific F(1) (P(1) x P(2)) and in the F(2 )(P(1) x P(2)) generations. Mite resistance was assessed by a repellence test. Broad-sense heritability of acylsugar contents was moderately high (h(2)(b) = 0.476). Frequency distributions in the P(1), P(2), F(1) and F(2) can be explained by the action of a single major locus, with near-complete dominance of the L. esculentum allele for low-acylsugar content over the L. pennellii allele for high content. Indirect selection for high levels of acylsugars in leaflets led to correlated increases in the levels of mite repellency, indicating that acylsugars may be the main factor involved in mite resistance
Texto completo:
1
Colección:
01-internacional
Base de datos:
LILACS
Asunto principal:
Feromonas
/
Solanum lycopersicum
/
Tetranychidae
/
Repelentes de Insectos
Límite:
Animals
Idioma:
En
Revista:
Genet. mol. res. (Online)
Asunto de la revista:
BIOLOGIA MOLECULAR
/
GENETICA
Año:
2002
Tipo del documento:
Article
País de afiliación:
Brasil
Pais de publicación:
Brasil