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Quantitative trait loci associated with trichomes in the Solanum galapagense accession LA1401

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Abstract

Pest resistance in Solanum galapagense has been associated with the presence of type IV glandular trichomes and allelochemicals. Knowledge of the genetic factors involved in determining the presence and type of trichomes may assist in the process of gene introgression for development of pest resistant tomato cultivars. In this study, we sought to identify QTLs associated with the presence of type IV trichomes in an F2 population derived from the interspecific cross of Solanum lycopersicum TOM-684 × S. galapagense accession LA1401. Two QTLs contributing to type IV trichome occurrence and density were detected, one major QTL (gal.IV-2), responsible for 35.22% of phenotypic variation, was located on chromosome 2. The other QTL (gal.IV-3) was located on chromosome 3, and explained 23.35% of the phenotypic variation in the F2 population. These QTLs were responsible for 26.44 and 3.37% of the variation observed in a progeny derived from a backcross to TOM-684. The same QTLs were also associated with type II + III non-glandular trichomes, whose densities were negatively correlated to those of type IV trichomes, suggesting that the loci found may have pleiotropic effects for high type IV/low type II + III trichome densities. Our results indicate that the inheritance for type IV trichomes can be explained by a few genetic factors affecting the presence of a gland and the density of trichomes. These results further suggest a revision to trichome classification used for tomato may be appropriate.

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Acknowledgements

The authors thank all colleagues for their help with the laborious trichome phenotyping experiments. Acknowledgments to the Universities, agencies and company that supported this research project: Universidade Federal de Lavras (UFLA), The Ohio State University (OSU), Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES), Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq), Fundação de Amparo à Pesquisa do Estado de Minas Gerais (FAPEMIG) and HortiAgro Sementes S.A.

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Correspondence to Marcela Carvalho Andrade.

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Andrade, M.C., da Silva, A.A., Carvalho, R.d. et al. Quantitative trait loci associated with trichomes in the Solanum galapagense accession LA1401. Genet Resour Crop Evol 65, 1671–1685 (2018). https://doi.org/10.1007/s10722-018-0644-3

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  • DOI: https://doi.org/10.1007/s10722-018-0644-3

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