Tradeoffs associated with constitutive and induced plant resistance against herbivory

Proceedings of the National Academy of Sciences of the United States of America - Tập 108 Số 14 - Trang 5685-5689 - 2011
Anne Kempel1, Martin Schädler2, Thomas Chrobock1, Markus Fischer1, Mark van Kleunen1
1Institute of Plant Sciences, University of Bern, 3013 Bern, Switzerland; and
2Department for Community Ecology, Helmholtz Center for Environmental Research, 06110 Halle, Germany

Tóm tắt

Several prominent hypotheses have been posed to explain the immense variability among plant species in defense against herbivores. A major concept in the evolutionary ecology of plant defenses is that tradeoffs of defense strategies are likely to generate and maintain species diversity. In particular, tradeoffs between constitutive and induced resistance and tradeoffs relating these strategies to growth and competitive ability have been predicted. We performed three independent experiments on 58 plant species from 15 different plant families to address these hypotheses in a phylogenetic framework. Because evolutionary tradeoffs may be altered by human-imposed artificial selection, we used 18 wild plant species and 40 cultivated garden-plant species. Across all 58 plant species, we demonstrate a tradeoff between constitutive and induced resistance, which was robust to accounting for phylogenetic history of the species. Moreover, the tradeoff was driven by wild species and was not evident for cultivated species. In addition, we demonstrate that more competitive species—but not fast growing ones—had lower constitutive but higher induced resistance. Thus, our multispecies experiments indicate that the competition–defense tradeoff holds for constitutive resistance and is complemented by a positive relationship of competitive ability with induced resistance. We conclude that the studied genetically determined tradeoffs are indeed likely to play an important role in shaping the high diversity observed among plant species in resistance against herbivores and in life history traits.

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Proceedings of the National Academy of Sciences of the United States of America

Tập 108 Số 14

5685-5689

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