Phospholipases and galactolipases trigger oxylipin-mediated wound-activated defence in the red alga Gracilaria chilensis against epiphytes

Lion U.; Wiesemeier, T; Weinberger F.; Beltran J.; Flores, V; Faugeron, S; Correa, J; Pohnert, G

Abstract

We investigated the wound response of the commercially important red alga, Gracilaria chilensis, in order to obtain insight into its interaction with epiphytic pests. After wounding, the host releases free fatty acids as well as the hydroxylated eicosanoids, 8R-hydroxy eicosatetraenoic acid (8-HETE) and 7S,8R-dihydroxy eicosatetraenoic acid (7,8-di-HETE). While the release of free arachidonic acid and subsequent formation of 8-HETE is controlled by phospholipase A, 7,8-di-HETE production is independent of this lipase. This dihydroxylated fatty acid might be directly released from galactolipids. Physiologically relevant concentrations of oxylipins reduced spore settlement of Acrochaetium sp. (Rhodophyta, Acrochaetiaceae) and suppressed the development of hapteria in Ceramium rubrum (Rhodophyta, Ceramiaceae) when these model epiphytes were exposed to artificial surfaces that contained 8-HETE or 7,8-di-HETE. Thus, the immediate release of oxylipins can be seen as G. chilensis defence against epiphytes. © 2006 Wiley-VCH Verlag GmbH & Co. KGaA.

Más información

Título según WOS: Phospholipases and galactolipases trigger oxylipin-mediated wound-activated defence in the red alga Gracilaria chilensis against epiphytes
Título según SCOPUS: Phospholipases and galactolipases trigger oxylipin-mediated wound-activated defence in the red alga Gracilaria chilensis against epiphytes
Título de la Revista: CHEMBIOCHEM
Volumen: 7
Número: 3
Editorial: WILEY-V C H VERLAG GMBH
Fecha de publicación: 2006
Página de inicio: 457
Página final: 462
Idioma: English
URL: http://doi.wiley.com/10.1002/cbic.200500365
DOI:

10.1002/cbic.200500365

Notas: ISI, SCOPUS