A Desulfatation-Oxidation Cascade Activates Coumarin-Based Cross-Linkers in the Wound Reaction of the Giant Unicellular Alga Dasycladus vermicularis

摘要

Plants and algae protect themselves against environmental threats by fast, wound-activated processes in which metabolites that are stored within the tissue are transformed enzymatically. For example, it was recognized early on that plants and algae rely on the wound-activated action of lipases and lipoxygenases to produce a structural variety of oxylipins that can play important roles in chemical defense. Wound-activated enzymatic reactions can not only be employed to generate efficient chemical defenses against herbivore attack or pathogenic invasion, but may also serve to mechanically protect the tissue or cells.Wound sealing is particularly important for siphonous green macroalgae because of their remarkable organization: they comprise a single giant cell that can reach several meters in length.