Variability in host plant chemistry: behavioural responses and life-history parameters of the Colorado potato beetle (Leptinotarsa decemlineata) |
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Authors: | Anne Lyytinen Leena Lindström Johanna Mappes Riitta Julkunen–Tiitto Sergey R Fasulati Kari Tiilikkala |
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Institution: | 1. Department of Biological and Environmental Science, University of Jyv?skyl?, P.O. Box 35, FI-40014, Finland 2. Natural Product Research Laboratory, Department of Biology, University of Joensuu, P.O. Box 111, FI-80101, Joensuu, Finland 3. Department of Entomology and Plant Immunity to Pests, All-Russia Institute of Plant Protection (VIZR), 3 Podbelsky shosse, St. Petersburg-Pushkin, 196608, Russia 4. Plant Production Research, Agrifood Research Finland (MTT), FI-31600, Jokioinen, Finland
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Abstract: | Summary. Many studies investigating effects of plant chemicals on herbivore performance have reported contradictory results, perhaps
because of possible interaction between different chemicals. Also, a herbivore’s performance is not necessarily consistent
with its food or oviposition preference. Our aim was to investigate simultaneously antibiosis (larval growth and survival)
and antixenosis (oviposition and feeding preferences) responses in herbivore to three plant chemicals, of which one is expected
to have positive and two are expected to have negative effects. Antibiosis was measured by correlating the nitrogen and glycoalkaloid
levels in host plants to the survival and adult size of Leptinotarsa decemlineata, by rearing larvae on whole plants of three potato varieties. Although host plants differed in their glycoalkaloid levels,
survival rate and adult body size did not differ among beetles reared on different potato varieties. This suggests that beetles
are quite robust for differences in both foliar α-chaconine and foliar α-solanine content. However, differences in antixenosis
were found although they could not be directly predicted from the leaf chemistry. Females preferred to lay their eggs on the
variety with high α-solanine content (Nevsky) towards which males showed a tendency to feeding preference. Overall, our results
confirm that beetles are well adapted to the chemical defences of potato plants as potato varieties did not significantly
affect beetle performance, but differences in oviposition preference may still result in major differences in the amount of
damage inflicted on plants in the fields. |
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Keywords: | larval diet glycoalkaloids nitrogen antibiosis resistance antixenosis Coleoptera Chrysomelidae Leptinotarsa decemlineata Solanum tuberosum |
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