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Plant Physiol

Title:		"Auxin Is Rapidly Induced by Herbivore Attack and Regulates a Subset of Systemic, Jasmonate-Dependent Defenses"
Author(s):		Machado RA; Robert CA; Arce CC; Ferrieri AP; Xu S; Jimenez-Aleman GH; Baldwin IT; Erb M;
Address:		"Max Planck Institute for Chemical Ecology, 07745 Jena, Germany (R.A.R.M., C.A.M.R., C.C.M.A., A.P.F., S.X., G.H.J.-A., I.T.B., M.E.);Institute of Plant Sciences, University of Bern, 3013 Bern, Switzerland (R.A.R.M., C.A.M.R., C.C.M.A., M.E.); andDepartamento de Entomologia, Universidade Federal de Vicosa, 36570-000 Vicosa, Brazil (C.C.M.A.). Max Planck Institute for Chemical Ecology, 07745 Jena, Germany (R.A.R.M., C.A.M.R., C.C.M.A., A.P.F., S.X., G.H.J.-A., I.T.B., M.E.);Institute of Plant Sciences, University of Bern, 3013 Bern, Switzerland (R.A.R.M., C.A.M.R., C.C.M.A., M.E.); andDepartamento de Entomologia, Universidade Federal de Vicosa, 36570-000 Vicosa, Brazil (C.C.M.A.) matthias.erb@ips.unibe.ch"
Journal Title:		Plant Physiol
Year:		2016
Volume:		20160802
Issue:		1
Page Number:		521 - 532
DOI:		10.1104/pp.16.00940
ISSN/ISBN:		1532-2548 (Electronic) 0032-0889 (Print) 0032-0889 (Linking)
Abstract:		"Plant responses to herbivore attack are regulated by phytohormonal networks. To date, the role of the auxin indole-3-acetic acid (IAA) in this context is not well understood. We quantified and manipulated the spatiotemporal patterns of IAA accumulation in herbivore-attacked Nicotiana attenuata plants to unravel its role in the regulation of plant secondary metabolism. We found that IAA is strongly, rapidly, and specifically induced by herbivore attack. IAA is elicited by herbivore oral secretions and fatty acid conjugate elicitors and is accompanied by a rapid transcriptional increase of auxin biosynthetic YUCCA-like genes. IAA accumulation starts 30 to 60 s after local induction and peaks within 5 min after induction, thereby preceding the jasmonate (JA) burst. IAA accumulation does not require JA signaling and spreads rapidly from the wound site to systemic tissues. Complementation and transport inhibition experiments reveal that IAA is required for the herbivore-specific, JA-dependent accumulation of anthocyanins and phenolamides in the stems. In contrast, IAA does not affect the accumulation of nicotine or 7-hydroxygeranyllinalool diterpene glycosides in the same tissue. Taken together, our results uncover IAA as a rapid and specific signal that regulates a subset of systemic, JA-dependent secondary metabolites in herbivore-attacked plants"
Keywords:		"Animals Cyclopentanes/*metabolism Gene Expression Profiling/methods Gene Expression Regulation, Plant Herbivory/*physiology Host-Parasite Interactions Indoleacetic Acids/*metabolism Manduca/physiology Oxylipins/*metabolism Plant Growth Regulators/metaboli;"
Notes:		"MedlineMachado, Ricardo A R Robert, Christelle A M Arce, Carla C M Ferrieri, Abigail P Xu, Shuqing Jimenez-Aleman, Guillermo H Baldwin, Ian T Erb, Matthias eng 293926/ERC_/European Research Council/International Research Support, Non-U.S. Gov't 2016/08/04 Plant Physiol. 2016 Sep; 172(1):521-32. doi: 10.1104/pp.16.00940. Epub 2016 Aug 2"