Constraints to herbivore-induced systemic responses: bidirectional signaling along orthostichies in Nicotiana attenuata

Journal of Chemical Ecology
U Schittko, Ian T Baldwin

Abstract

We investigated the impact of leaf vascular connections on systemically transmitted herbivore-induced gene expression in Nicotiana attenuata. Although systemic signaling is clearly associated with the plant vascular system, few studies consider vascular architecture when measuring systemically induced defenses. N. attenuata is a plant with dispersed phyllotaxis approximating 3/8 in the rosette stage of growth. We mimicked Manduca sexta herbivory by introducing larval regurgitant to wounds produced with a standardized continuous mechanical wounding and investigated mRNA accumulation of genes. Herbivory in N. attenuata induces the expression of genes coding for a proteinase inhibitor protein (PI), threonine deaminase (TD, EC 4.3.1.19), a luminal-binding protein (BiP), and an alpha-dioxygenase (alpha-DOX). We measured the systemic response of sink leaves when orthostichous (growing at an angular distance of 0 degrees) source leaves were treated, and vice versa, and compared it to the systemic response of leaves growing at the maximum angular distance of 180 degrees. Vascular architecture clearly controlled the intensity of systemic mRNA accumulation within the 4-hr time frame of the experiment. In addition, we found signal translo...Continue Reading

Citations

May 1, 2006·Functional Plant Biology : FPB·Amy E ZanneColin M Orians
Dec 11, 2007·Journal of Experimental Botany·Wioletta E PluskotaIan T Baldwin
Feb 13, 2013·The New Phytologist·Colin G N Turnbull, Rosa M Lopez-Cobollo
Mar 13, 2014·The Plant Journal : for Cell and Molecular Biology·Emmanuel GaquerelIan T Baldwin
Mar 9, 2017·Frontiers in Plant Science·Michael EisenringJörg Romeis
Mar 10, 2007·The Plant Journal : for Cell and Molecular Biology·Shree P Pandey, Ian T Baldwin
Oct 1, 2005·Journal of Chemical Ecology·Colin Orians
Feb 3, 2009·Plant, Cell & Environment·Jianqiang Wu, Ian T Baldwin
Jan 23, 2009·Journal of Chemical Ecology·Cesar R Rodriguez-SaonaChristopher J Frost
Jun 9, 2005·Current Opinion in Plant Biology·Anthony L Schilmiller, Gregg A Howe
Aug 22, 2009·Phytochemistry·Abraham J K Koo, Gregg A Howe

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