Abstract
In this study we tested for trade-offs between the benefit arbuscular mycorrhizal (AM) fungi provide for hosts and their competitive ability in host roots, and whether this potential trade-off shifts in the presence of a plant stress (herbivory). We used three species of AM fungi previously determined to vary in host growth promotion and spore production in association with host plants. We found that these AM fungal species competed for root space, and the best competitor, Scutellospora calospora, was the worst mutualist. In addition, the worst competitor, Glomus white, was the best mutualist. Competition proved to have stronger effects on fungal infection patterns than herbivory, and competitive dominance was not altered by herbivory. We found a similar pattern in a previous test of competition among AM fungi, and we discuss the implications of these results for the persistence of the mutualism and feedbacks between AM fungi and their plant hosts.
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Acknowledgements
We would like to thank David McNutt, Julie Gummow, Dacia Montemayor, Alex Nguyen, Tommy Zajac, and Deane Bowers for assistance with data collection, protocols, and equipment; and Fred Nijhout, Laura Grunert, and Deane Bowers for providing J. coenia butterflies, and help rearing them. We would like to thank Keith Clay, Heather Reynolds, Curt Lively, Peggy Schultz, Scott Mangan, Tom Platt, Jennifer Rudgers, Jon Haloin, Michael Dawson, Mirka Macel, Pat McIntyre, Elizabeth Seifer, and the Bever/Schultz lab group for taking the time to review and discuss this paper with us. We would like to thank Jason Hoeksema, Peter Kennedy, and two anonymous reviewers for their comments on the manuscript. We acknowledge the support of Sigma Xi Grant-In-Aid of Research, Indiana University McCormick Grant, and NSF grants DEB-0407816 to Alison Bennett and DEB-0049080 to Jim Bever. All experiments comply with the current laws of the United States.
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Communicated by Jeremy Burdon.
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Bennett, A.E., Bever, J.D. Trade-offs between arbuscular mycorrhizal fungal competitive ability and host growth promotion in Plantago lanceolata . Oecologia 160, 807–816 (2009). https://doi.org/10.1007/s00442-009-1345-6
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DOI: https://doi.org/10.1007/s00442-009-1345-6