| Title: | Inheritance of acylsugar contents in tomatoes derived from an interspecific cross with the wild tomato Lycopersicon pennellii and their effect on spider mite repellence |
| Author(s): | Resende JT; Maluf WR; Cardoso M; Nelson DL; Faria MV; |
| Address: | "Departamento de Agricultura, Universidade Federal de Lavras (UFLA), Caixa Postal 37, 37200-000 Lavras, MG, Brazil" |
| ISSN/ISBN: | 1676-5680 (Electronic) 1676-5680 (Linking) |
| 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" |
| Keywords: | "Animals Colorimetry Crosses, Genetic *Insect Repellents/analysis/pharmacology Solanum lycopersicum/chemistry/*genetics/parasitology Pest Control, Biological Pheromones/analysis/*genetics/pharmacology Quantitative Trait, Heritable Tetranychidae/*drug effec;" |
| Notes: | "MedlineResende, Juliano T V Maluf, Wilson Roberto Cardoso, Maria das Gracas Nelson, David L Faria, Marcos Ventura eng Brazil 2004/02/14 Genet Mol Res. 2002 Jun 30; 1(2):106-16" |
