Phospholipases and galactolipases trigger an oxylipin-mediated wound activated defense of the red alga Gracilaria chilensis against ephiphytes.

Lion, U., Wiesemeier, T., Weinberger, Florian , Beltran, J., Flores, V., Faugeron, S., Correa, J. and Pohnert, G. (2006) Phospholipases and galactolipases trigger an oxylipin-mediated wound activated defense of the red alga Gracilaria chilensis against ephiphytes. ChemBioChem, 7 . pp. 457-462. DOI 10.1002/cbic.200500365.

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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.

Document Type: Article
Keywords: biosynthesis; epiphytism; fatty acids; lipids; plant–plant interactions
Research affiliation: OceanRep > GEOMAR > FB3 Marine Ecology > FB3-EOE-B Experimental Ecology - Benthic Ecology
Refereed: Yes
Open Access Journal?: No
DOI etc.: 10.1002/cbic.200500365
ISSN: 1439-4227
Date Deposited: 03 Dec 2008 16:51
Last Modified: 21 Jan 2019 15:34
URI: http://oceanrep.geomar.de/id/eprint/5954

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