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Mol Plant

Title:		Phosphoinositide and inositolpolyphosphate signalling in defense responses of Arabidopsis thaliana challenged by mechanical wounding
Author(s):		Mosblech A; Konig S; Stenzel I; Grzeganek P; Feussner I; Heilmann I;
Address:		"Department of Plant Biochemistry, Albrecht-von-Haller-Institute for Plant Sciences, Georg-August-University Gottingen, Justus-von-Liebig-Weg 11, 37077 Gottingen, Germany"
Journal Title:		Mol Plant
Year:		2008
Volume:		1
Issue:		2
Page Number:		249 - 261
DOI:		10.1093/mp/ssm028
ISSN/ISBN:		1674-2052 (Print) 1674-2052 (Linking)
Abstract:		"Various biochemical signals are implicated in Arabidopsis wound signalling, including jasmonic acid (JA), salicylic acid, auxin, and Ca2+. Here, we report on cross-talk of phytohormones with phosphoinositide signals not previously implicated in plant wound responses. Within 30 min of mechanical wounding of Arabidopsis rosette-leaves, the levels of the lipid-derived soluble inositolpolyphosphate, inositol 1,4,5-trisphosphate (InsP(3)), increased four to five-fold. Concomitantly, the precursor lipids, phosphatidylinositol 4,5-bisphosphate, phosphatidylinositol 4-phosphate and phosphatidylinositol transiently depleted, followed by re-synthesis after 30-60 min of stimulation. Increased InsP(3) levels with wounding coincided with JA increases over the first hours of stimulation. In dde2-2-mutant plants deficient in JA biosynthesis, no InsP(3) increase was observed upon wounding, indicating that JA was required for InsP(3) formation, and InsP(3) levels increased in wild-type plants challenged with sorbitol, increasing endogenous JA levels. In InsP 5-ptase plants with attenuated phosphoinositide signalling, the induction of wounding-inducible genes was diminished compared with wild-type plants, suggesting a role for phosphoinositide signalling in mediating plant wound responses. The gene-expression patterns suggest that phosphoinositides contribute to both JA-dependent and JA-independent aspects of wound signalling. Weight gain of Plutella xylostella caterpillars feeding on InsP 5-ptase plants was increased compared with that of caterpillars feeding on wild-type plants. The ecophysiological relevance of phosphoinositide signals in plant defense responses to herbivory is discussed in light of recent findings of inositolpolyphosphate involvement in phytohormone-receptor function"
Keywords:		"Animals Arabidopsis/drug effects/genetics/parasitology/*physiology Calcium/physiology Cyclopentanes/metabolism Gene Expression Regulation, Plant Hydroponics Indoleacetic Acids/metabolism Inositol 1, 4, 5-Trisphosphate/metabolism Inositol 1, 4, 5-Trisphosphate;"
Notes:		"MedlineMosblech, Alina Konig, Sabine Stenzel, Irene Grzeganek, Peter Feussner, Ivo Heilmann, Ingo eng Research Support, Non-U.S. Gov't England 2008/03/01 Mol Plant. 2008 Mar; 1(2):249-61. doi: 10.1093/mp/ssm028"