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Plant Cell Environ

Title:		Jasmonic acid does not mediate root growth responses to wounding in Arabidopsis thaliana
Author(s):		Schmidt L; Hummel GM; Schottner M; Schurr U; Walter A;
Address:		"Institut Phytosphare (ICG-3), Forschungszentrum Julich GmbH, Julich, Germany"
Journal Title:		Plant Cell Environ
Year:		2010
Volume:		20091104
Issue:		1
Page Number:		104 - 116
DOI:		10.1111/j.1365-3040.2009.02062.x
ISSN/ISBN:		1365-3040 (Electronic) 0140-7791 (Linking)
Abstract:		"Jasmonic acid (JA) is a crucial plant defence signalling substance that has recently been shown to mediate herbivory-induced root growth reduction in the ecological model species Nicotiana attenuata. To clarify whether JA-induced reduction of root growth might be a general response increasing plant fitness under biotic stress, a suite of experiments was performed with the model plant Arabidopsis thaliana. JA bursts were elicited in leaves of A. thaliana in different ways. Root growth reduction was neither induced by foliar application of herbivore oral secretions nor by direct application of methyl jasmonate to leaves. Root growth reduction was observed when leaves were infected with the pathogen Pseudomonas syringae pv. tomato, which persistently induces the JA signalling pathway. Yet, high resolution growth analyses of this effect in wild type and JA biosynthesis knock-out mutants showed that it was elicited by the bacterial toxin coronatine that suggests ethylene- but not JA-induced root growth reduction in A. thaliana. Overall, the results demonstrate that the reaction of root growth to herbivore-induced JA signalling differs among species, which is discussed in the context of different ecological defence strategies among species"
Keywords:		Acetates/pharmacology Amino Acids/pharmacology Animals Arabidopsis/growth & development/*metabolism Cyclopentanes/*metabolism/pharmacology Cyclopropanes/pharmacology Ethylenes/metabolism Gene Knockout Techniques Indenes/pharmacology Oxylipins/*metabolism/;
Notes:		"MedlineSchmidt, Lilian Hummel, Gregoire M Schottner, Matthias Schurr, Ulrich Walter, Achim eng Research Support, Non-U.S. Gov't 2009/11/10 Plant Cell Environ. 2010 Jan; 33(1):104-16. doi: 10.1111/j.1365-3040.2009.02062.x. Epub 2009 Nov 4"