Reassessing the role of phospholipase D in the Arabidopsis wounding response

Bastiaan O.R. Bargmann, Ana M. Laxalt, Bas Ter Riet, Christa Testerink, Emmanuelle Merquiol, Alina Mosblech, Antonio Leon-Reyes, Corné M.J. Pieterse, Michel A. Haring, Ingo Heilmann, Dorothea Bartels, Teun Munnik

Producción científica: Contribución a una revistaArtículorevisión exhaustiva

67 Citas (Scopus)

Resumen

Plants respond to wounding by means of a multitude of reactions, with the purpose of stifling herbivore assault. Phospholipase D (PLD) has previously been implicated in the wounding response. Arabidopsis (Arabidopsis thaliana) AtPLDα1 has been proposed to be activated in intact cells, and the phosphatidic acid (PA) it produces to serve as a precursor for jasmonic acid (JA) synthesis and to be required for wounding-induced gene expression. Independently, PLD activity has been reported to have a bearing on wounding-induced MAPK activation. However, which PLD isoforms are activated, where this activity takes place (in the wounded or non-wounded cells) and what exactly the consequences are is a question that has not been comprehensively addressed. Here, we show that PLD activity during the wounding response is restricted to the ruptured cells using 32Pi-labelled phospholipid analyses of Arabidopsis pld knock-out mutants and PLD-silenced tomato cell-suspension cultures. pldα1 knock-out lines have reduced wounding-induced PA production, and the remainder is completely eliminated in a pldα1/δ double knock-out line. Surprisingly, wounding-induced protein kinase activation, AtLOX2 gene expression and JA biosynthesis were not affected in these knock-out lines. Moreover, larvae of the Cabbage White butterfly (Pieris rapae) grew equally well on wild-type and the pld knock-out mutants.

Idioma originalInglés
Páginas (desde-hasta)837-850
Número de páginas14
PublicaciónPlant, Cell and Environment
Volumen32
N.º7
DOI
EstadoPublicada - jul. 2009
Publicado de forma externa

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