Lion, Ulrich; Wiesemeier, Theresa; Weinberger, Florian; Beltran, Jessica; Flores, Verónica; Faugeron, Sylvain; Correa, Juan; Pohnert, Georg:
Phospholipases and Galactolipases Trigger Oxylipin-mediated wound –activated defence in the red alga Gracilaria chilensis against epiphytes
2006
In: ChemBioChem : a European journal of chemical biology, Jg. 7 (2006), Heft 3, S. 457 - 462
Artikel/Aufsatz in Zeitschrift2006Biologie
Titel:
Phospholipases and Galactolipases Trigger Oxylipin-mediated wound –activated defence in the red alga Gracilaria chilensis against epiphytes
Autor(in):
Lion, Ulrich; Wiesemeier, Theresa; Weinberger, Florian; Beltran, Jessica; Flores, Verónica; Faugeron, Sylvain; Correa, Juan; Pohnert, Georg
Erscheinungsjahr
2006
WWW URL

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.