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J Chem Ecol

Title:		"Effects of drought stress and nutrient availability on dry matter allocation, phenolic glycosides, and rapid induced resistance of poplar to two lymantriid defoliators"
Author(s):		Hale BK; Herms DA; Hansen RC; Clausen TP; Arnold D;
Address:		"Department of Entomology, The Ohio State University/Ohio Agricultural Research and Development Center, 1680 Madison Avenue, Wooster, OH 44691, USA. bethanhale@yahoo.co.uk"
Journal Title:		J Chem Ecol
Year:		2005
Volume:		20051025
Issue:		11
Page Number:		2601 - 2620
DOI:		10.1007/s10886-005-7616-8
ISSN/ISBN:		0098-0331 (Print) 0098-0331 (Linking)
Abstract:		"The growth-differentiation balance hypothesis (GDBH) postulates that variation in resource availability can increase or decrease allocation to secondary metabolism, depending on how growth is affected relative to carbon assimilation. Growth and leaf area of black poplar (Populus nigra) increased substantially in response to increased nutrient availability, while net assimilation rate and photosynthesis were less strongly affected. In response, total phenolic glycoside concentrations declined, which is consistent with GDBH. Drought stress decreased net assimilation rate and photosynthesis as well as growth, while increasing total phenolic glycoside concentrations. This pattern does not follow GDBH, which predicts lower secondary metabolism when resource limitation decreases both growth and carbon assimilation. However, there was a strong negative correlation between growth and total phenolic glycoside concentration consistent with a trade-off between primary and secondary metabolism, a key premise of GDBH. Drought decreased the growth of gypsy moth (Lymantria dispar) larvae but had no effect on whitemarked tussock moth (Orgyia leucostigma). Increased nutrient availability had a positive linear effect on growth of whitemarked tussock moth, but no effect on gypsy moth. Treatment effects on gypsy moth corresponded closely with effects on total phenolic glycosides, whereas effects on whitemarked tussock moth more closely tracked changes in nutritional quality. Localized gypsy moth herbivory elicited rapid induced resistance to gypsy moth, with the effect being independent of water and nutrient availability, but did not affect whitemarked tussock moth, indicating that the effects of biotic and abiotic stress on insect resistance of trees can be species-specific"
Keywords:		Animals Carbon/chemistry/metabolism *Disasters Glycosides/chemistry Host-Parasite Interactions/*physiology Larva/growth & development Moths/*physiology Nutritive Value Phenols/chemistry/*metabolism Plant Leaves/chemistry/growth & development Population Dy;
Notes:		"MedlineHale, Bethan K Herms, Daniel A Hansen, Robert C Clausen, Thomas P Arnold, Danielle eng Research Support, Non-U.S. Gov't Research Support, U.S. Gov't, Non-P.H.S. 2005/11/08 J Chem Ecol. 2005 Nov; 31(11):2601-20. doi: 10.1007/s10886-005-7616-8. Epub 2005 Oct 25"