Plant-herbivore interactions or colonization history: what drives changes in plant chemical defenses after invasion?
Castells, Eva (Universitat Autònoma de Barcelona. Departament de Farmacologia, de Terapèutica i de Toxicologia)
Vilatersana, Roser (Institut Botànic de Barcelona)

Fecha: 2013
Resumen: Biological invasions offer a good opportunity to study the changes in plant-herbivore interactions at ecological and evolutionary levels, because introduced plants encounter a complete novel biotic environment. Once in the novel range, plants generally experience a decreased herbivore predation due to a loss of specialist herbivores from the plant native area. This lower herbivory has been associated to changes in plant chemical defenses at population level. With no enemies associated, plants assigning more resources to growth and reproduction and fewer to chemical defenses would be favorable selected increasing the species invasion capacity, as suggested by the Evolution of Increased Competitive Ability (EICA) hypothesis. However, levels of secondary metabolites are highly determined by plant genetics, and thus changes in chemical defenses after invasion could be a result of the plant colonization history. To determine whether changes in plant chemical defenses after invasion are a result of an evolutionary process driven by herbivores or simply determined by the plant invasion pathways, we have conducted an study using Senecio pterophorus (Asteraceae) as a model system. A broad biogeographical survey was conducted covering all areas where S. pterophorus had been previously reported, including the native range (South Africa), the expanded range (Western Cape) and two introduced regions (Australia and Europe). Levels of in situ herbivory were determined for 640 individual plants. Additionally, leaves and seeds were collected to analyze genetic neutral markers (AFLPs) and chemical defenses (pyrrolizidine alkaloids). S. pterophorus from the invaded areas (Australia and Europe) suffered lower herbivory compared to plants from the native area (South Africa), and levels of pyrrolizidine alkaloids were higher in Australia and lower in Europe compared to plants from South Africa. We discuss whether the phylogeographical origin or, in contrast, the decrease in herbivore predation in the introduced populations can explain the observed differences in the type and concentrations of pyrrolizidine alkaloids after invasion.
Nota: Número d'acord de subvenció MICINN/CGL2008-02421/BOS
Nota: Número d'acord de subvenció MICINN/CGL2011-29205
Derechos: Aquest document està subjecte a una llicència d'ús Creative Commons. Es permet la reproducció total o parcial i la comunicació pública de l'obra, sempre que no sigui amb finalitats comercials, i sempre que es reconegui l'autoria de l'obra original. No es permet la creació d'obres derivades. Creative Commons
Lengua: Anglès.
Documento: conferenceObject
Materia: Chemical ecology
Publicado en: Gordon Conference of Plant-herbivore interactions. Ventura, California (EUA), : 2013

1 p, 1.2 MB

El registro aparece en las colecciones:
Documentos de investigación > Documentos de los grupos de investigación de la UAB > Centros y grupos de investigación (producción científica) > Ciencias de la salud y biociencias > Chemical Ecology and Toxicology Lab
Contribuciones a jornadas y congresos > Pósters

 Registro creado el 2015-10-19, última modificación el 2018-11-20

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