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Physiol Plant

Title:		Spatial association of photosynthesis and chemical defense in Arabidopsis thaliana following herbivory by Trichoplusia ni
Author(s):		Tang J; Zielinski R; Aldea M; DeLucia E;
Address:		"Department of Plant Biology, University of Illinois, Urbana, IL 61801, USA"
Journal Title:		Physiol Plant
Year:		2009
Volume:		20090623
Issue:		2
Page Number:		115 - 124
DOI:		10.1111/j.1399-3054.2009.01265.x
ISSN/ISBN:		1399-3054 (Electronic) 0031-9317 (Linking)
Abstract:		"Because they share common precursors and require significant amounts of energy, photosynthesis and defense against herbivores and pathogens may be inversely related. This relationship was examined in Arabidopsis thaliana exposed to herbivory by Trichoplusia ni neonates. The spatial pattern of photosynthesis was compared statistically with that of induction of the defense-related cinnamate-4-hydroxylase (C4H) gene across individual leaves exposed to herbivory in transgenic plants harboring a C4H:GUS gene fusion. In portions of the leaf where C4H:GUS expression was upregulated, photosynthesis was depressed, while non-photochemical quenching was increased, suggesting a trade-off between these two processes. However, photosynthetic damage spread further into surrounding areas than the induction of C4H:GUS expression. Photosynthetic depression was observed up to 1 mm from the edges of holes, whereas C4H:GUS induction typically was limited to about 0.5 mm or less from edges. Other mechanisms may be responsible for the spread of photosynthetic damage beyond where C4H-related defense was induced. Alternatively, C4H induction may reflect a subset of defensive responses more limited in their spatial distribution than the downregulation of photosynthesis. The suppression of photosynthesis in remaining leaf tissue represents a 'hidden cost' of herbivore damage"
Keywords:		"Animals Arabidopsis/genetics/*metabolism Gene Expression Regulation, Plant Genes, Plant Moths/*physiology Photosynthesis/*physiology Plant Leaves/genetics/metabolism Plants, Genetically Modified/genetics/metabolism Trans-Cinnamate 4-Monooxygenase/genetics;"
Notes:		"MedlineTang, Jennie Zielinski, Ray Aldea, Mihai DeLucia, Evan eng Research Support, U.S. Gov't, Non-P.H.S. Denmark 2009/08/07 Physiol Plant. 2009 Oct; 137(2):115-24. doi: 10.1111/j.1399-3054.2009.01265.x. Epub 2009 Jun 23"