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New Phytol

Title:		The role of abscisic acid and water stress in root herbivore-induced leaf resistance
Author(s):		Erb M; Kollner TG; Degenhardt J; Zwahlen C; Hibbard BE; Turlings TC;
Address:		"FARCE Laboratory, University of Neuchatel, Neuchatel, Switzerland"
Journal Title:		New Phytol
Year:		2011
Volume:		20100914
Issue:		1
Page Number:		308 - 320
DOI:		10.1111/j.1469-8137.2010.03450.x
ISSN/ISBN:		1469-8137 (Electronic) 0028-646X (Linking)
Abstract:		"* Herbivore-induced systemic resistance occurs in many plants and is commonly assumed to be adaptive. The mechanisms triggered by leaf-herbivores that lead to systemic resistance are largely understood, but it remains unknown how and why root herbivory also increases resistance in leaves. * To resolve this, we investigated the mechanism by which the root herbivore Diabrotica virgifera induces resistance against lepidopteran herbivores in the leaves of Zea mays. * Diabrotica virgifera infested plants suffered less aboveground herbivory in the field and showed reduced growth of Spodoptera littoralis caterpillars in the laboratory. Root herbivory did not lead to a jasmonate-dependent response in the leaves, but specifically triggered water loss and abscisic acid (ABA) accumulation. The induction of ABA by itself was partly responsible for the induction of leaf defenses, but not for the resistance against S. littoralis. Root-herbivore induced hydraulic changes in the leaves, however, were crucial for the increase in insect resistance. * We conclude that the induced leaf resistance after root feeding is the result of hydraulic changes, which reduce the quality of the leaves for chewing herbivores. This finding calls into question whether root-herbivore induced leaf-resistance is an evolved response"
Keywords:		"Abscisic Acid/metabolism/*physiology Animals Coleoptera/*physiology Feeding Behavior Plant Leaves/metabolism/physiology Plant Roots/metabolism/physiology *Stress, Physiological Water/*metabolism Zea mays/metabolism/*physiology;"
Notes:		"MedlineErb, Matthias Kollner, Tobias G Degenhardt, Jorg Zwahlen, Claudia Hibbard, Bruce E Turlings, Ted C J eng Research Support, Non-U.S. Gov't England 2010/09/16 New Phytol. 2011 Jan; 189(1):308-20. doi: 10.1111/j.1469-8137.2010.03450.x. Epub 2010 Sep 14"