Journal Article

PreJuSER-7583

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Jasmonic acid does not mediate root growth responses to wounding in Arabidopsis thaliana

Schmidt, L.FZJ* ; Hummel, G. M.FZJ* ; Schöttner, M. ; Schurr, U.FZJ* ; Walter, A.FZJ*

2010
Wiley-Blackwell Oxford [u.a.]

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Please use a persistent id in citations: doi:10.1111/j.1365-3040.2009.02062.x

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.

Keyword(s): Acetic Acids: pharmacology (MeSH) ; Amino Acids: pharmacology (MeSH) ; Animals (MeSH) ; Arabidopsis: growth & development (MeSH) ; Arabidopsis: metabolism (MeSH) ; Cyclopentanes: metabolism (MeSH) ; Cyclopentanes: pharmacology (MeSH) ; Cyclopropanes: pharmacology (MeSH) ; Ethylenes: metabolism (MeSH) ; Gene Knockout Techniques (MeSH) ; Indenes: pharmacology (MeSH) ; Oxylipins: metabolism (MeSH) ; Oxylipins: pharmacology (MeSH) ; Plant Leaves: metabolism (MeSH) ; Plant Roots: growth & development (MeSH) ; Pseudomonas syringae (MeSH) ; Signal Transduction (MeSH) ; Spodoptera (MeSH) ; Acetic Acids ; Amino Acids ; Cyclopentanes ; Cyclopropanes ; Ethylenes ; Indenes ; Oxylipins ; methyl jasmonate ; coronatine ; jasmonic acid ; ethylene ; J ; Pseudomonas syringae pv (auto) ; tomato (auto) ; coronatine (auto) ; ethylene (auto) ; image analysis (auto) ; phytohormones (auto) ; wounding (auto)

Note: We thank John Turner (University of East Anglia, UK) for donation of A. thaliana coi1-1 seeds, and the NASC (Nottingham, UK) for A. thaliana aos and Col-6 seeds.Pseudomonas syringae pv. tomato DC3000 avrRpt2 were a kind gift of Corne Pieterse (Utrecht University, the Netherlands) and Pseudomonas syringae pv. tomato DC3000 NCPPB 1008 were kindly provided by Diane Cuppels and Teresa Ainsworth (Agriculture and Agri-Food Canada, London ON, Canada).We thank Roland Reist (Syngenta Crop Protection, Stein, Switzerland) for the Spodoptera littoralis eggs and Jon F. Fobes (AgroFresh Inc., Spring House, USA) for the SmartFresh powder.Vicky Temperton, Michael Thorpe and several other colleagues are thanked for critical discussion and helpful comments. This work was supported by funding from the Forschungszentrum Julich. L.S. acknowledges the support for her PhD thesis at the Heinrich-Heine-Universitat Dusseldorf.

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Research Program(s):

1. Terrestrische Umwelt (P24)

Appears in the scientific report 2010

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