Natural hybridization between Senecio jacobaea and Senecio aquaticus: molecular and chemical evidence

Molecular Ecology
Heather KirkKlaas Vrieling

Abstract

Hybridization is known to be involved in a number of evolutionary processes, including species formation, and the generation of novel defence characteristics in plants. The genus Senecio of the Asteraceae family is highly speciose and has historically demonstrated significant levels of interspecific hybridization. The evolution of novel chemical defence characteristics may have contributed to the success of Senecio hybrids. Chemical defence against pathogens and herbivores has been studied extensively in the model species Senecio jacobaea, which is thought to hybridize in nature with Senecio aquaticus. Here, we use amplified fragment length polymorphisms (AFLPs) and pyrrolizidine alkaloid (PA) composition to confirm that natural hybridization occurs between S. jacobaea and the closely related species S. aquaticus. AFLPs are also used to estimate the ancestry of hybrids. We also demonstrate that even highly back-crossed hybrids can possess a unique mixture of defence chemicals specific to each of the parental species. This hybrid system may therefore prove to be useful in further studies of the role of hybridization in the evolution of plant defence and resistance.

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Citations

Jan 25, 2012·TheScientificWorldJournal·Matthias Suter, Andreas Lüscher
Mar 27, 2012·Metabolomics : Official Journal of the Metabolomic Society·Heather KirkPeter G L Klinkhamer
Apr 12, 2005·The New Phytologist·Heather KirkPeter G L Klinkhamer
Jul 7, 2005·The New Phytologist·Heather KirkEd van der Meijden
May 31, 2011·American Journal of Botany·Pieter B PelserLinda E Watson
Apr 9, 2011·Phytochemistry Reviews : Proceedings of the Phytochemical Society of Europe·Dandan ChengPeter G L Klinkhamer
Jan 22, 2015·Journal of Agricultural and Food Chemistry·Remigius ChizzolaGerhard Karrer

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