caa a22 4500 463168402 CHVBK 20180406164806.0 cr unu---uuuuu 170326e20071201xx s 000 0 eng 10.1007/s10530-007-9089-x doi (NATIONALLICENCE)springer-10.1007/s10530-007-9089-x No evidence for root-mediated allelopathy in Centaurea solstitialis , a species in a commonly allelopathic genus [Elektronische Daten] [Bo Qin, Jennifer Lau, Joseph Kopshever, Ragan Callaway, Heather McGray, Laura Perry, Tiffany Weir, Mark Paschke, Jose Hierro, John Yoder, Jorge Vivanco, Sharon Strauss] Phytotoxicity bioassays and pot experiments using activated carbon both suggest that Centaurea solstitialis (yellow star-thistle) does not rely on phytotoxic root exudates for invasion of California grasslands. Pot experiments in which five native species were grown in the presence/absence of C. solstitialis and in the presence/absence of activated carbon (fully crossed design) showed that C. solstitialis competitively suppressed native species, but did not inhibit them through allelochemicals. In separate experiments examining the role of root exudates in invasion success, treatment with crude root exudates and chloroform-extracted root exudates from C. solstitialis reduced growth of the model plant Arabidopsis thaliana. However, high concentrations of the exudates (50%, v/v or 500μgmL−1) were required to inhibit A. thaliana growth and did not result in A. thaliana mortality, suggesting the presence of only a weak growth inhibitor. Moreover, high concentrations of C. solstitialis crude root exudates did not affect the growth of five native grass species often displaced by C. solstitialis invasions in California grasslands. Finally, root exudates collected from C. solstitialis had weaker effects on a native California root parasite, Triphysaria versicolor, than root exudates collected from Zea mays, a species not renowned for its competitive or invasive capabilities. Our results suggest that, while C. solstitialis might possibly "be persuaded to yield a product that is toxic to one species or another” (Population biology of plants, Academic, 1977), we find no evidence that allelopathic root exudates play a role in the competitive success of this invasive. Springer Science+Business Media, Inc., 2007 Allelopathy nationallicence Invasion nationallicence Competition nationallicence Exudates nationallicence Activated carbon nationallicence Centaurea nationallicence Qin Bo Center for Rhizosphere Biology, Colorado State University, 80521, Fort Collins, CO, USA aut Lau Jennifer Center for Population Biology, University of California, 95616, Davis, CA, USA aut Kopshever Joseph Center for Population Biology, University of California, 95616, Davis, CA, USA aut Callaway Ragan Division of Biological Sciences, The University of Montana, 59812, Missoula, MT, USA aut McGray Heather Department of Plant Sciences, University of California, 95616, Davis, CA, USA aut Perry Laura Center for Rhizosphere Biology, Colorado State University, 80521, Fort Collins, CO, USA aut Weir Tiffany Center for Rhizosphere Biology, Colorado State University, 80521, Fort Collins, CO, USA aut Paschke Mark Center for Rhizosphere Biology, Colorado State University, 80521, Fort Collins, CO, USA aut Hierro Jose Division of Biological Sciences, The University of Montana, 59812, Missoula, MT, USA aut Yoder John Department of Ecology and Evolutionary Biology, University of California, 92697, Irvine, CA, USA aut Vivanco Jorge Center for Rhizosphere Biology, Colorado State University, 80521, Fort Collins, CO, USA aut Strauss Sharon Center for Population Biology, University of California, 95616, Davis, CA, USA aut Biological Invasions Springer Netherlands 9/8(2007-12-01), 897-907 1387-3547 9:8<897 2007 9 10530 https://doi.org/10.1007/s10530-007-9089-x text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s10530-007-9089-x text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Qin Bo Center for Rhizosphere Biology, Colorado State University, 80521, Fort Collins, CO, USA aut NATIONALLICENCE 700 1- Lau Jennifer Center for Population Biology, University of California, 95616, Davis, CA, USA aut NATIONALLICENCE 700 1- Kopshever Joseph Center for Population Biology, University of California, 95616, Davis, CA, USA aut NATIONALLICENCE 700 1- Callaway Ragan Division of Biological Sciences, The University of Montana, 59812, Missoula, MT, USA aut NATIONALLICENCE 700 1- McGray Heather Department of Plant Sciences, University of California, 95616, Davis, CA, USA aut NATIONALLICENCE 700 1- Perry Laura Center for Rhizosphere Biology, Colorado State University, 80521, Fort Collins, CO, USA aut NATIONALLICENCE 700 1- Weir Tiffany Center for Rhizosphere Biology, Colorado State University, 80521, Fort Collins, CO, USA aut NATIONALLICENCE 700 1- Paschke Mark Center for Rhizosphere Biology, Colorado State University, 80521, Fort Collins, CO, USA aut NATIONALLICENCE 700 1- Hierro Jose Division of Biological Sciences, The University of Montana, 59812, Missoula, MT, USA aut NATIONALLICENCE 700 1- Yoder John Department of Ecology and Evolutionary Biology, University of California, 92697, Irvine, CA, USA aut NATIONALLICENCE 700 1- Vivanco Jorge Center for Rhizosphere Biology, Colorado State University, 80521, Fort Collins, CO, USA aut NATIONALLICENCE 700 1- Strauss Sharon Center for Population Biology, University of California, 95616, Davis, CA, USA aut NATIONALLICENCE 773 0- Biological Invasions Springer Netherlands 9/8(2007-12-01), 897-907 1387-3547 9:8<897 2007 9 10530 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer