| Item type: | Article | ||||
|---|---|---|---|---|---|
| Journal or Publication Title: | Chemoecology | ||||
| Publisher: | SPRINGER BASEL AG | ||||
| Place of Publication: | BASEL | ||||
| Volume: | 27 | ||||
| Number of Issue or Book Chapter: | 4 | ||||
| Page Range: | pp. 155-169 | ||||
| Date: | 2017 | ||||
| Institutions: | Biology, Preclinical Medicine > Institut für Pflanzenwissenschaften > Group Plant Systematics and Evolution (Prof. Dr. Christoph Oberprieler) Chemistry and Pharmacy > Institute of Pharmacy > Pharmaceutical Biology (Prof. Heilmann) | ||||
| Identification Number: |
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| Keywords: | S. OVATUS COMPOSITAE; PYRROLIZIDINE ALKALOID PATTERNS; PLANT-HERBIVORE INTERACTIONS; SNAIL ARIANTA-ARBUSTORUM; SECONDARY COMPOUNDS; CHEMICAL DIVERSITY; RESISTANCE; SESQUITERPENES; HYBRIDIZATION; VULGARIS; Herbivory; Hybridization; Molluscs; Pyrrolizidine alkaloids; Senecio nemorensis syngameon; Tannins | ||||
| Dewey Decimal Classification: | 500 Science > 540 Chemistry & allied sciences 500 Science > 580 Botanical sciences | ||||
| Status: | Published | ||||
| Refereed: | Yes, this version has been refereed | ||||
| Created at the University of Regensburg: | Yes | ||||
| Item ID: | 39306 |
Abstract
Differences in herbivore resistance between parental and hybrid taxa influence the trajectories of hybrid swarms and may lead to the maintenance or breakdown of species boundaries. In the present study, phytochemical patterns in terms of pyrrolizidine alkaloids (PAs) and tannins in three central European representatives of the Senecio nemorensis syngameon (i.e., S. germanicus, S. hercynicus, S. ...
Abstract
Differences in herbivore resistance between parental and hybrid taxa influence the trajectories of hybrid swarms and may lead to the maintenance or breakdown of species boundaries. In the present study, phytochemical patterns in terms of pyrrolizidine alkaloids (PAs) and tannins in three central European representatives of the Senecio nemorensis syngameon (i.e., S. germanicus, S. hercynicus, S. ovatus) were inferred and the selective consumption among the pure species and among the pure species and their reciprocal hybrids was studied in food-choice (`cafeteria') experiments using two mollusc species. The results show significant qualitative and quantitative differences in chemical composition among the three plant species. Artificial F-1 hybrids of the two investigated plant systems S. germanicusS. ovatus and S. hercynicus-S. ovatus mainly expressed an additive PA pattern compared to the parental taxa. PA concentration was highest in S. hercynicus, intermediate in S. ovatus and lowest in S. germanicus, while tannin concentration was lower in S. hercynicus compared to S. ovatus and S. germanicus. Food-choice experiments revealed significant plant species-specific preferences exhibited by the two mollusc species (the slug Arion fuscus and the snail Trochulus striolatus danubialis). Consistent negative correlations between the total PA concentration and the consumed leaf area were only observed for the snail, but not for the slug species. When reciprocal hybrid taxa were added to the foodchoice designs, the plant taxon-specific differences in consumption disappeared. Additionally, no significant effect of tannin concentration on strength of herbivory was observed. The present results of food-choice experiments in three representatives of the S. nemorensis syngameon, therefore, demonstrate that PAs rather than tannins influence taxonspecific herbivory by molluscs. However, they also suggest that trajectories of mixed stands and hybrid swarms in the wild could be more pronouncedly determined by the local composition of mollusc communities, the frequency of intermediate chemotypes (hybrids), and other factors (e.g., morphology, other biotic and abiotic conditions).
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