Phytotoxic properties of cnicin, a sesquiterpene lactone fromcentaurea maculosa (spotted knapweed)

Kelsey, Rick G.; Locken, Laura J.

doi:10.1007/bf01020348

Cited by 82 publications

(50 citation statements)

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“…The results showed an important production of sesquiterpene lactones, an important toxin with known activity against generalist herbivores (Amorim et al 2013), that gradually increased in C. solstitialis' non-native regions (Sotes et al 2015). Other preceding works with Centaurea invasive species had also suggested that sesquiterpene lactones could play a significant role in their success in their non-native regions (Kelsey & Locken 1987, Stevens et al 1990, Landau et al 1994. In order to experimentally assess for potential differences in SDH patterns we fed generalist herbivore Helix aspersa Müller, 1,774 snails with leaves from the invasive C. solstitialis, and also with leaves of the exotic but non-invasive C. sulphurea Lag.…”

Section: Introductionmentioning

confidence: 77%

Invasive and non-invasive congeneric Centaurea (Asteraceae) show contrasting patterns of herbivory by snails

Filipe¹,

Jorge²,

Eren³

et al. 2016

Plecevo

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Section: Introductionmentioning

confidence: 77%

Invasive and non-invasive congeneric Centaurea (Asteraceae) show contrasting patterns of herbivory by snails

Filipe¹,

Jorge²,

Eren³

et al. 2016

Plecevo

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“…No differences in herbivore damage between plants from different origins were detected in the French sites of the reciprocal transplant experiment, suggesting that invasive French plants maintained defence against generalists (but also that they were not better defended). Finally, sesquiterpene lactones that have phytotoxic properties (Kelsey and Locken 1987) are also involved in ragweed allelopathy (Be´res et al 1998). For all of these reasons reallocation of resources from at least this class of defences to growth and reproduction may not have been selected in A. artemisiifolia.…”

Section: Differences In Vigourmentioning

confidence: 99%

Enemy release but no evolutionary loss of defence in a plant invasion: an inter-continental reciprocal transplant experiment

et al. 2005

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When invading new regions exotic species may escape from some of their natural enemies. Reduced top-down control ("enemy release") following this escape is often invoked to explain demographic expansion of invasive species and also may alter the selective regime for invasive species: reduced damage can allow resources previously allocated to defence to be reallocated to other functions like growth and reproduction. This reallocation may provide invaders with an "evolution of increased competitive ability" over natives that defend themselves against specialist enemies. We tested for enemy release and the evolution of increased competitive ability in the North American native ragweed (Ambrosia artemisiifolia: Asteraceae), which currently is invading France. We found evidence of enemy release in natural field populations from the invaded and native ranges. Further we carried out a reciprocal transplant experiment, comparing several life history traits of plants from two North American (Ontario and South Carolina) and one French population in four common gardens on both continents. French and Canadian plants had similar flowering phenologies, flowering earlier than plants from further south in the native range. This may suggest that invasive French plants originated from similar latitudes to the Canadian population sampled. As with natural populations, experimental plants suffered far less herbivore damage in France than in Ontario. This difference in herbivory translated into increased growth but not into increased size or vigour. Moreover, we found that native genotypes were as damaged as invading ones in all experimental sites, suggesting no evolutionary loss of defence against herbivores.

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“…Examples of phytochemicals with multiple activities include cnicin in spotted knapweed (Kelsey & Locken 1987;Landau et al 1994), glucosinolates in the Brassicaceae (Siemens et al 2002) and monoterpenes in Thymus vulgaris (Linhart & Thompson 1999). If potent novel phytochemistry commonly manifests itself through multiple biological activities, leaf herbivory could be a useful proxy for allelopathy or antimicrobial activity in predicting invasiveness because it is simple to measure.…”

Section: Discussionmentioning

confidence: 99%

Invasive exotic plants suffer less herbivory than non-invasive exotic plants

2005

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We surveyed naturally occurring leaf herbivory in nine invasive and nine non-invasive exotic plant species sampled in natural areas in Ontario, New York and Massachusetts, and found that invasive plants experienced, on average, 96% less leaf damage than non-invasive species. Invasive plants were also more taxonomically isolated than non-invasive plants, belonging to families with 75% fewer native North American genera. However, the relationship between taxonomic isolation at the family level and herbivory was weak. We suggest that invasive plants may possess novel phytochemicals with anti-herbivore properties in addition to allelopathic and antimicrobial characteristics. Herbivory could be employed as an easily measured predictor of the likelihood that recently introduced exotic plants may become invasive.

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Phytotoxic properties of cnicin, a sesquiterpene lactone fromcentaurea maculosa (spotted knapweed)

Cited by 82 publications

References 50 publications

Invasive and non-invasive congeneric Centaurea (Asteraceae) show contrasting patterns of herbivory by snails

Invasive and non-invasive congeneric Centaurea (Asteraceae) show contrasting patterns of herbivory by snails

Enemy release but no evolutionary loss of defence in a plant invasion: an inter-continental reciprocal transplant experiment

Invasive exotic plants suffer less herbivory than non-invasive exotic plants

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