Novel weapons: Invasive plant suppresses fungal mutualists in America but not in its native Europe

Callaway, Ragan M.; Cipollini, Don; Barto, Kathryn; Thelen, Giles C.; Hallett, Steven G.; Prati, Daniel; Stinson, Kristina; Klironomos, John (2008). Novel weapons: Invasive plant suppresses fungal mutualists in America but not in its native Europe. Ecology, 89(4), pp. 1043-1055. Washington, D.C.: Ecological Society of America 10.1890/07-0370.1

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Why some invasive plant species transmogrify from weak competitors at home to strong competitors abroad remains one of the most elusive questions in ecology. Some evidence suggests that disproportionately high densities of some invaders are due to the release of biochemicals that are novel, and therefore harmful, to naive organisms in their new range. So far, such evidence has been restricted to the direct phytotoxic effects of plants on other plants. Here we found that one of North America's most aggressive invaders of undisturbed forest understories, Alliaria petiolata (garlic mustard) and a plant that inhibits mycorrhizal fungal mutualists of North American native plants, has far stronger inhibitory effects on mycorrhizas in invaded North American soils than on mycorrhizas in European soils where A. petiolata is native. This antifungal effect appears to be due to specific flavonoid fractions in A. petiolata extracts. Furthermore, we found that suppression of North American mycorrhizal fungi by A. petiolata corresponds with severe inhibition of North American plant species that rely on these fungi, whereas congeneric European plants are weakly affected. These results indicate that phytochemicals, benign to resistant mycorrhizal symbionts in the home range, may be lethal to naive native mutualists in the introduced range and indirectly suppress the plants that rely on them.

Item Type:

Journal Article (Original Article)

Division/Institute:

08 Faculty of Science > Department of Biology > Institute of Plant Sciences (IPS) > Plant Ecology
08 Faculty of Science > Department of Biology > Institute of Plant Sciences (IPS)

UniBE Contributor:

Prati, Daniel

ISSN:

0012-9658

Publisher:

Ecological Society of America

Language:

English

Submitter:

Peter Alfred von Ballmoos-Haas

Date Deposited:

04 Oct 2013 15:08

Last Modified:

13 Jun 2014 14:41

Publisher DOI:

10.1890/07-0370.1

Web of Science ID:

000255580200019

URI:

https://boris.unibe.ch/id/eprint/30118 (FactScience: 171980)

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