Invasive knotweed affects native plants through allelopathy

Craig Murrell, Esther Gerber, Christine Krebs, Madalin Parepa, Urs Schaffner, Oliver Bossdorf
American Journal of Botany 2011, 98 (1): 38-43

PREMISE OF STUDY: There is increasing evidence that many plant invaders interfere with native plants through allelopathy. This allelopathic interference may be a key mechanism of plant invasiveness. One of the most aggressive current plant invaders is the clonal knotweed hybrid Fallopia × bohemica, which often forms monocultures in its introduced range. Preliminary results from laboratory studies suggest that allelopathy could play a role in this invasion.

METHODS: We grew experimental communities of European plants together with F. × bohemica. We used activated carbon to test for allelopathic effects, and we combined this with single or repeated removal of Fallopia shoots to examine how mechanical control can reduce the species' impact.

KEY RESULTS: Addition of activated carbon to the soil significantly reduced the suppressive effect of undamaged F. × bohemica on native forbs. The magnitude of this effect was similar to that of regular cutting of Fallopia shoots. Regular cutting of Fallopia shoots efficiently inhibited the growth of rhizomes, together with their apparent allelopathic effects.

CONCLUSIONS: The ecological impact of F. × bohemica on native forbs is not just a result of competition for shared resources, but it also appears to have a large allelopathic component. Still, regular mechnical control successfully eliminated allelopathic effects. Therefore, allelopathy will create an additional challenge to knotweed management and ecological restoration only if the allelochemicals are found to persist in the soil. More research is needed to examine the mechanisms underlying Fallopia allelopathy, and the long-term effects of soil residues.

Full Text Links

Find Full Text Links for this Article


You are not logged in. Sign Up or Log In to join the discussion.

Related Papers

Remove bar
Read by QxMD icon Read

Save your favorite articles in one place with a free QxMD account.


Search Tips

Use Boolean operators: AND/OR

diabetic AND foot
diabetes OR diabetic

Exclude a word using the 'minus' sign

Virchow -triad

Use Parentheses

water AND (cup OR glass)

Add an asterisk (*) at end of a word to include word stems

Neuro* will search for Neurology, Neuroscientist, Neurological, and so on

Use quotes to search for an exact phrase

"primary prevention of cancer"
(heart or cardiac or cardio*) AND arrest -"American Heart Association"