Evidence for two genetically and chemically defined host races of Tyria jacobaeae (Arctiidae, Lepidoptera) |
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| Authors: | Michael Wink Luc Legal |
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| Institution: | Institut für Pharmazeutische Biologie, Universit?t Heidelberg, Im Neuenheimer Feld 364, 69120 Heidelberg, Germany, e-mail: wink@uni-hd.de, DE
Equipe Biodiversité et Evolution des Arthropodes, Laboratoire d'Ecologie Terrestre-UMR5552, Batiment IVR3 Zoologie-Ecologie, CNRS-Université Paul Sabatier, 118, Route de Narbonne, F-31062 Toulouse cedex 4, France, FR
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| Abstract: | Summary. A widely distributed host race of Tyria jacobaeae lives on Senecio jacobaea and related species and accumulates pyrrolizidine alkaloids (“PA race”), another race, which is restricted to the Alps and
found on Petasites paradoxus, sequesters sesquiterpenes, such as petasol and isopetasol. Nucleotide sequences of the mitochondrial 16S rDNA gene show
1% sequence divergence, indicating that genetical differences exist between the PA exploiting and the terpene-sequestering
host races of T. jacobaeae. This finding suggests that both host races of T. jacobaeae must have been separated for some time already, possibly since the Pleistocene.
Received 2 May 2001; accepted 1 June 2001. |
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| Keywords: | ,Tyria jacobaeae—, host races —, mitochondrial DNA —, pyrrolizidine alkaloids, sesquiterpenes —,Senecio—,Petasites |
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