Different regulation of haloperoxidation during agar oligosaccharide-activated defence mechanisms in two related red algae, Gracilaria sp. and Gracilaria chilensis

Journal of Experimental Botany
Florian WeinbergerPhilippe Potin

Abstract

The related red seaweeds Gracilaria sp. from the eastern Mediterranean and Gracilaria chilensis from Chile were similar in their enzymatic inventory for halogenation. In both species, halogenation was dependent upon H(2)O(2) and thus driven by haloperoxidases. These could be inhibited with phosphate and reversibly inhibited with azide and were therefore apparently dependent upon vanadate. Both species generated in the first line bromoform and other brominated halocarbons. Gel electrophoresis under non-denaturating conditions demonstrated that both species expressed halogenating peroxidases. Elicitation of Gracilaria sp. with agar oligosaccharides resulted in marked increases in bromination, iodination, and chlorination. Production rates of volatile halocarbons and phenol red bromination both increased by a factor of eight, presumably due to increased availability for haloperoxidases of H(2)O(2) during the oxidative burst response. Elicitation of Gracilaria sp. also triggered a release of bromide ions through DIDS-sensitive anion channels, which allowed for some bromination in bromide-free medium. However, this effect was relatively limited. By contrast, agar oligosaccharide oxidation in G. chilensis did not increase halogenatio...Continue Reading

Citations

Feb 13, 2015·Marine Drugs·Louisi Souza de OliveiraFabiano L Thompson
Sep 14, 2010·Trends in Plant Science·Claire M M GachonGwang Hoon Kim
Feb 1, 2014·Journal of Phycology·Ruth E McDowellBill J Baker
Apr 16, 2010·Chemistry : a European Journal·Amanda-Lynn Marshall, Peter J Alaimo
Apr 25, 2018·Marine Biotechnology·Thillai PunithaJohn Beardall
Sep 22, 2020·Annual Review of Marine Science·Colleen M Hansel, Julia M Diaz

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