Glandular trichomes of Solanum berthaultii and its hybrids with potato deter oviposition and impair growth of potato tuber moth |
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Authors: | Raksha Malakar and Ward M. Tingey |
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Affiliation: | (1) Department of Entomology, Cornell University, Insectary Building, Tower Road, Ithaca, NY 14853, USA |
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Abstract: | Glandular trichomes on foliage of the wild potato species, Solanum berthaultii Hawkes, deter oviposition by the potato tuber moth (PTM), Phthorimaea operculella Zeller and negatively affect other important performance parameters. Oviposition deterring factors are localized in the glandular trichomes of S. berthaultii. When mechanically transferred to foliage of a susceptible potato cultivar, trichome contents reduced egg laying by 97%. Removal of glandular trichomes from S. berthaultii foliage using a combination of chemical and mechanical procedures increased oviposition rates ca. 210-fold. Removal of trichomes also led to increased mobility of larvae on the leaf surface, more leaf feeding, shorter larval development and larger pupae. The resistance conferred by glandular trichomes of S. berthaultii provides an important genetic trait potentially useful for management of PTM. |
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Keywords: | acylsugar glandular trichome host-plant resistance oviposition Phthorimaea operculella potato tuber moth potato tuberworm Solanum berthaultii Solanum tuberosum |
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