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J Chem Ecol

Title:		Interactive effects of simulated nitrogen deposition and altered precipitation patterns on plant allelochemical concentrations
Author(s):		Jamieson MA; Quintero C; Blumenthal DM;
Address:		"Department of Entomology, University of Wisconsin - Madison, 1630 Linden Drive, Madison, WI, 53706, USA, maryajamieson@gmail.com"
Journal Title:		J Chem Ecol
Year:		2013
Volume:		20130906
Issue:		9
Page Number:		1204 - 1208
DOI:		10.1007/s10886-013-0340-x
ISSN/ISBN:		1573-1561 (Electronic) 0098-0331 (Linking)
Abstract:		"Global environmental change alters the supply of multiple limiting resources that regulate plant primary and secondary metabolism. Through modifications in resource availability, acquisition, and allocation, global change is likely to influence plant chemical defenses, and consequently species interactions that are mediated by these compounds. While many studies focus on individual global change factors, simultaneous changes in abiotic factors may interact to influence plant allelochemicals. In this study, we examined the individual and interactive effects of nitrogen enrichment and altered precipitation patterns on chemical defense compounds (iridoid glycosides) of an invasive plant, Linaria dalmatica. Plants were grown from seed in native mixed-grass prairie for 2 years. Nitrogen and water treatments were applied in each growing season over this period. Results indicate that soil water and nitrogen availability interact to shape plant chemical defense concentrations in L. dalmatica. Nitrogen addition decreased iridoid glycoside concentrations by approximately 25% under reduced water availability, increased concentrations by 37% in ambient water plots, and had no effect on these chemical defenses for plants growing under augmented water supply. Thus, results show differing patterns of allelochemical response to nitrogen enrichment, with respect to both the magnitude and direction of change, depending on water availability. Our study demonstrates the importance of examining multiple environmental factors in order to predict potential changes in plant chemical defenses with climate change"
Keywords:		Iridoid Glycosides/*metabolism Linaria/growth & development/*metabolism Nitrogen/*metabolism Pheromones/*metabolism Rain Water/metabolism;
Notes:		"MedlineJamieson, Mary A Quintero, Carolina Blumenthal, Dana M eng Research Support, U.S. Gov't, Non-P.H.S. 2013/09/07 J Chem Ecol. 2013 Sep; 39(9):1204-8. doi: 10.1007/s10886-013-0340-x. Epub 2013 Sep 6"