Abstract
We examined the relationship between internal resources (root reserves), external resources (soil fertility), and allocation to defense vs. growth in the clonal, perennial herb Solanum carolinense. In a short-term (9 d) greenhouse experiment, plants were treated once with jasmonic acid (JA) to determine if polyphenols and glycoalkaloids were inducible by simulated herbivory. In a longer-term (4 wk) greenhouse experiment, we measured the cost, in terms of growth, of treatment with JA every 3 d, to determine if the induced response was due more to carbon limitation or nitrogen limitation. We manipulated the resources available to the plants by varying soil fertility and the size of root cuttings from which plants were grown, and assessed how different resource levels affected the growth and production of polyphenols and alkaloids under JA treatment or control conditions. In the short term, JA increased the concentration of polyphenols in both above- and belowground plant parts, as well as alkaloid concentrations in the roots. In the long term, the only significant secondary chemistry response to JA was an increased polyphenol concentration in above ground tissues. The total amount of polyphenols produced was the same for JA and control plants, indicating that the higher concentration was a result of the lower biomass of treated plants. In contrast, alkaloid concentrations in plants treated with JA for 4 wk did not differ from controls, but JA-treated plants contained lower total amounts of alkaloids in above ground tissues, as a result of decreased growth. Fertilizer level and root cutting size had effects on growth and the production of secondary compounds and influenced the cost of induction. Plants grown under high fertility had a greater reduction in growth in response to JA than plants grown under low fertility, indicating a greater trade-off between growth and defense for high fertility plants. Plants from larger root cuttings grew bigger without any reduction in the concentration of polyphenols and alkaloids. We demonstrated that the phenotype of S. carolinense was plastic in response to simulated herbivory, fertility level, and root cutting size, and that there was a significant growth cost to induction that varied with the environment and appears to be due in large part to the allocation of limited carbon reserves.
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Acknowledgments
The authors are grateful to Toni Schaeffer for guidance in the greenhouse and in the lab, and to Eric Paulk for help with the GA analysis. Thanks are also due to Isabel Ashton, Adam Eher, and Elizabeth Leger for comments on an earlier draft of the manuscript. R.L.W. was supported by a National Science Foundation Root Biology Training Grant (NSF DBI 96002255) and supplies were provided by a National Science Foundation Long Term Research in Environmental Biology grant to J.C.S. (DEB-9974067).
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Walls, R., Appel, H., Cipollini, M. et al. Fertility, Root Reserves and the Cost of Inducible Defenses in the Perennial Plant Solanum carolinense. J Chem Ecol 31, 2263–2288 (2005). https://doi.org/10.1007/s10886-005-7101-4
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DOI: https://doi.org/10.1007/s10886-005-7101-4