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Heritability of 2-tridecanone-mediated arthropod resistance in an interspecific segregating generation of tomato

L.V. Barbosa; W.R. Maluf

Departamento de Agricultura, Universidade Federal de Lavras, Caixa Postal 37, 37200-000 Lavras, MG, Brasil. Send correspondence to W.R.M.

ABSTRACT

The methyl-ketone, 2-tridecanone (2-TD), present in the tips of glandular trichomes abundant in Lycopersicon hirsutum var. glabratum is the major toxic factor involved in the high levels of anthropod resistance found in this taxon. The introgression of high 2-TD content into the cultivated tomato species Lycopersicon esculentum could lead to improved insect tolerance of tomato cultivars. In this study, 2-TD content was measured colorimetrically in the foliage of L. esculentum line TSWV-547 (P₁), L. hirsutum var. glabratum PI 134417 (P₂), as well as in the F₁ (P₁ x P₂) and F₂ generations. Mean 2-TD concentrations (in 10^-12 mol/100 mm² leaf area) were 34.5, 224.1, 83.5 and 88.3, respectively for P₁, P₂, F₁ and F₂. Generation mean analysis indicated that a simple additive-dominance model does not fit the data. Broad-sense heritability of 2-TD concentration was estimated as 0.61 + 0.18, indicating that 2-TD-based selection should be effective as an indirect selection criterion for arthropod resistance.

Keywords: heritability; 2-tridecanone-mediated; arthropod; tomato.

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