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J Integr Plant Biol

Title:		"Silencing brassinosteroid receptor BRI1 impairs herbivory-elicited accumulation of jasmonic acid-isoleucine and diterpene glycosides, but not jasmonic acid and trypsin proteinase inhibitors in Nicotiana attenuata"
Author(s):		Yang DH; Baldwin IT; Wu J;
Address:		"Department of Molecular Ecology, Max Planck Institute for Chemical Ecology, Hans-Knoll Strasse 8, D-07745 Jena, Germany"
Journal Title:		J Integr Plant Biol
Year:		2013
Volume:		20130411
Issue:		6
Page Number:		514 - 526
DOI:		10.1111/jipb.12035
ISSN/ISBN:		1744-7909 (Electronic) 1672-9072 (Linking)
Abstract:		"The brassinosteroid (BR) receptor, BR insensitive 1 (BRI1), plays a critical role in plant development, but whether BRI1-mediated BR signaling is involved in plant defense responses to herbivores was largely unknown. Here, we examined the function of BRI1 in the resistance of Nicotiana attenuata (Solanaceae) to its specialist insect herbivore Manduca sexta. Jasmonic acid (JA) and JA-isoleucine conjugate (JA-Ile) are important hormones that mediate resistance to herbivores and we found that after wounding or simulated herbivory NaBRI1 had little effect on JA levels, but was important for the induction of JA-Ile. Further experiments revealed that decreased JAR (the enzyme for JA-Ile production) activity and availability of Ile in NaBRI1-silenced plants were likely responsible for the low JA-Ile levels. Consistently, M. sexta larvae gained more weight on NaBRI1-silenced plants than on the control plants. Quantification of insect feeding-induced secondary metabolites revealed that silencing NaBRI1 resulted in decreased levels of carbon-rich defensive secondary metabolites (hydroxygeranyllinalool diterpene glycosides, chlorogenic acid, and rutin), but had little effect on the nitrogen-rich ones (nicotine and trypsin proteinase inhibitors). Thus, NaBRI1-mediated BR signaling is likely involved in plant defense responses to M. sexta, including maintaining JA-Ile levels and the accumulation of several carbon-rich defensive secondary metabolites"
Keywords:		Animals Cyclopentanes/*metabolism Diterpenes/*metabolism Glycosides/*metabolism Herbivory/*physiology Isoleucine/*analogs & derivatives/metabolism Nicergoline/metabolism Oxylipins/*metabolism Plant Proteins/metabolism Trypsin Inhibitors;
Notes:		"MedlineYang, Da-Hai Baldwin, Ian T Wu, Jianqiang eng Research Support, Non-U.S. Gov't China (Republic : 1949- ) 2013/01/26 J Integr Plant Biol. 2013 Jun; 55(6):514-26. doi: 10.1111/jipb.12035. Epub 2013 Apr 11"