Abstract
According to theory, variation in plant secondary metabolism against herbivores is driven by variation in biotic and abiotic conditions interacting with plants genotype to determine the expression of resistance traits. Particularly, it has been long postulated that plants growing along latitudinal gradients experience changes in biotic and abiotic interactions, specifically leading to a decrease of plant toxicity towards the poles. We tested this hypothesis using the asteraceous species Smallanthus macroscyphus. Smallanthus species are known to contain sesquiterpene lactones (STLs), bitter compounds with a broad spectrum of biological activities, including deterrence to herbivores. S. macroscyphus showed a decrease in chemical diversity of STLs when investigating populations growing from the tropical regions to less tropical ones. Populations from lower latitudes were found to be more chemically diverse with enhydrin, uvedalin and fluctuanin as main components, while populations southward were chemically fairly uniform, with polymatin A as the main and largely dominant STL. The STL chemistry of S. macroscyphus is in agreement with the hypothesis that plants of tropical forests have a greater diversity of secondary metabolites when compared to their temperate counterparts.
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Acknowledgments
We thank Dr. Sergio Rasmann who made valuable contributions to the first draft, Dr. Gastón Aguilera, who helped with the statistics and the Late Dr. Fernando Navarro who supplied valuable information.
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This research was supported by ANPCyT (Grant PICTO 2004-503, PICT 2011-1871), CIUNT A26/403 and CONICET from Argentina. María V. Coll Aráoz and María I. Mercado received research grants from CONICET.
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Coll Aráoz, M.V., Mercado, M.I., Grau, A. et al. Intraspecific variation of sesquiterpene lactones associated to a latitudinal gradient in Smallanthus macroscyphus (Heliantheae: Asteraceae). Chemoecology 26, 143–151 (2016). https://doi.org/10.1007/s00049-016-0213-1
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DOI: https://doi.org/10.1007/s00049-016-0213-1