Up-Regulation of Lipoxygenase, Phospholipase, and Oxylipin-Production in the Induced Chemical Defense of the Red Alga Gracilaria chilensis against Epiphytes.

Weinberger, Florian , Lion, Ulrich, Delage, Ludovic, Kloareg, Bernard, Potin, Philippe, Beltrán, Jessica, Flores, Verónica, Faugeron, Sylvain, Correa, Juan and Pohnert, Georg (2011) Up-Regulation of Lipoxygenase, Phospholipase, and Oxylipin-Production in the Induced Chemical Defense of the Red Alga Gracilaria chilensis against Epiphytes. Journal of Chemical Ecology, 37 (7). pp. 677-686. DOI 10.1007/s10886-011-9981-9.

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Abstract

The red alga Gracilaria chilensis is commercially farmed for the production of agar hydrocolloids, but some susceptible algae in farms suffer from intense epiphyte growth. We investigated the induced chemical defense response of G. chilensis against epiphytes and demonstrated that an extract of an epiphyte-challenged alga can trigger a defense response. The hormonally active metabolites were purified by RP-HPLC. Treatment with the extract or the purified fraction changed the chemical profile of the alga and increased resistance against epiphyte spores. Semi-quantitative RT-PCR and enzyme assays demonstrated that this metabolic response occurs after an increase in lipoxygenase and phospholipase A2 activity. Although this suggests the involvement of regulatory oxylipins, neither jasmonic acid nor the algal metabolite prostaglandin E2 triggers comparable defense responses.

Document Type: Article
Keywords: Benthic Ecology; Induced defence; Red algae; Hormones; Epiphytism; Gracilaria chilensis; Bioassays
Research affiliation: OceanRep > GEOMAR > FB3 Marine Ecology > FB3-EOE-B Experimental Ecology - Benthic Ecology
Refereed: Yes
Open Access Journal?: No
DOI etc.: 10.1007/s10886-011-9981-9
ISSN: 0098-0331
Date Deposited: 26 Aug 2011 11:09
Last Modified: 03 Jul 2017 11:11
URI: http://oceanrep.geomar.de/id/eprint/12056

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