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Resistance to Helicoverpa armigera mediated by zingiberene and glandular trichomes in tomatoes for industrial processing

Author(s): J.F. Júnior, J.T.V. Resende, A.A. da Silva, A. Gabriel, A.R. Zeist*, R. Favaro, D.A. Nascimento, R.A. Zeist and C.K. Camargo

The Helicoverpa armigera (Hübner) is a recent pest in Brazil, causing losses in tomato production in the Espírito Santo and Goiás states, in Brazil. A promising alternative to control this insect pest is the development of resistent tomato varieties. The breeding programs have aimed to introduce alleles of resistance present in the wild tomato accessions in the cultivated tomato. Thus, the objective of this study was to identify resistance to in tomato genotypes with high zingiberene leaf contents in the segregating population (F2) from the first backcross to Solanum lycopersicum 'Redenção' from S. habrochaites var. hirsutum accession 'PI-127826'. For this, the glandular trichomes present in the leaves of the selected genotypes were quantified and submitted to two antixenosis and one antibiosis test of resistance to H. armigera. The genotypes 'RVTZ-2011-pl#117', 'RVTZ-2011-pl#185', 'RVTZ-2011-pl#335', and 'RVTZ-2011-pl#503' showed a high density of type IV and type VI glandular trichomes. These genotypes showed higher resistance levels to H. armigera by antixenosis and antibiosis than the Redenção variety. The indirect selection for high zingiberene content and high density of type IV and type VI trichomes was effective to obtain tomato genotypes with higher levels of resistance to H. armigera