Biotic interactions of marine algae

Potin, Philippe; Bouarab, Kamal; Salaün, Jean‐Pierre; Pohnert, Georg; Kloareg, Bernard

doi:10.1016/s1369-5266(02)00273-x

Cited by 159 publications

(122 citation statements)

References 63 publications

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“…No. P. patens and brown algae are also responsive to crude elicitor preparations of fungal pathogens or cell wall components released during the infection process (165,167). Very little is known about the immune system of green algae, the closest ancestors of land plants.…”

Section: A Brief Excursion Into the Evolutionary Origin Of Conserved mentioning

confidence: 99%

Plant Innate Immunity: Perception of Conserved Microbial Signatures

Schwessinger

Ronald

2012

Annu. Rev. Plant Biol.

310

252

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Plants and animals sense conserved microbial signatures through receptors localized to the plasma membrane and cytoplasm. These receptors typically carry or associate with non-arginine-aspartate (non-RD) kinases that initiate complex signaling networks cumulating in robust defense responses. In plants, coregulatory receptor kinases have been identified that not only are critical for the innate immune response but also serve an essential function in other regulatory signaling pathways.

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Section: A Brief Excursion Into the Evolutionary Origin Of Conserved mentioning

confidence: 99%

Plant Innate Immunity: Perception of Conserved Microbial Signatures

Schwessinger

Ronald

2012

Annu. Rev. Plant Biol.

310

252

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“…In both phyla, lipoxygenases catalyze the oxygenation of polyunsaturated fatty acids into hydroperoxy derivatives and other secondary products (Feusner and Wasternack, 2002;Soberman and Christmas, 2003). Both red and brown macroalgae also produce oxylipins, which are derived from C18 as well as from C20 fatty acids, and several studies indicate regulatory roles for at least some of these compounds in algal defense (reviewed by Potin et al, 2002;Pohnert, 2004).…”

Section: Secondary Signal Transductionmentioning

confidence: 99%

Pathogen-Induced Defense and Innate Immunity in Macroalgae

Weinberger

2007

The Biological Bulletin

132

101

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Abstract. Animals and vascular plants are known to defend themselves facultatively against pathogens, with innate receptors mediating their resistance. Macroalgal defense against microorganisms, in contrast, has until recently been regarded mainly as constitutive. Indeed, many macroalgae appear to be chemically defended at constantly high levels, and this is possibly one of the reasons why the first evidence of pathogen-aroused resistance in a macroalga was detected only a decade ago. Here, I summarize the results of studies that indicate the existence of pathogen-activated or pathogen-induced macroalgal defense. Most indications so far come from molecular investigations, which revealed major functional similarities among the defense systems of distant macroalgal clades and the innate immune systems of vascular plants and metazoans. Homologies exist in the primary and secondary defense-activating signals, as well as in the enzymes that are involved and the cellular responses that are activated. This strongly suggests that innate immunity also exists in relatively distinct macroalgal clades. However, a macroalgal receptor still needs to be isolated and characterized, and the molecular concept of macroalgal receptor-mediated immunity needs to be complemented with an ecological perspective on pathogen-induced defense, to develop a joint neuroecological perspective on seaweed-microbe interactions.

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“…It is widely accepted that the initiation of defense responses largely depends on the successful recognition of the pathogens based on specific elicitors produced by the pathogens (Potin et al 2002;Jones and Takemoto 2004;Zipfel 2009). Elicitors can be divided into endogenous and exogenous elicitors based on their origins (Weinberger and Friedlander 2000;Küpper et al 2001, Küpper et al 2006Cosse et al 2007).…”

Section: Introductionmentioning

confidence: 99%

Defense responses in female gametophytes of Saccharina japonica (Phaeophyta) induced by flg22-derived peptides

Zhang

et al. 2015

J Appl Phycol

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Plants and algae can detect the presence of bacteria via sensing of proteins or peptides of bacterial origin. Flg22, a fragment of bacterial flagellin, is one of these peptides and has been shown to be an effective elicitor in both plants and algae. Here, we investigated the elicitor activity of flg22-derived peptides in the brown alga, Saccharina japonica. By monitoring luminoldependent fluorescence, we could observe that the release of H 2 O 2 induced by flg22-derived peptides is maximal at 2 h after induction. The elicitor activity was depending on the length of the peptides in the order of flg22 > flg15 > flg14. Cytological observations regarding the presence of reactive oxygen species (ROS) after induction were consistent with quantitative measurements of H 2 O 2 generation using a 2′,7′-dichlorofluorescein diacetate (DCFH-DA) fluorescent probe. Addition of 1 μM each of flg22 and flg15 was sufficient to inhibit growth of female gametophytes. Furthermore, the elicitor activity of C-terminally shortened flg15-derived peptides suggests that flg15 apparently is the smallest peptide with elicitor activity. Amino acid position D43 at the N-terminus of a flagellin was demonstrated to be involved in the elicitor activity. Finally, H 2 O 2 was localized in the plasma membranes of female gametophytes by an NADPH oxidase inhibitor and electron-dense deposits of cerium perhydroxide by transmission electron microscope.

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Biotic interactions of marine algae

Cited by 159 publications

References 63 publications

Plant Innate Immunity: Perception of Conserved Microbial Signatures

Plant Innate Immunity: Perception of Conserved Microbial Signatures

Pathogen-Induced Defense and Innate Immunity in Macroalgae

Defense responses in female gametophytes of Saccharina japonica (Phaeophyta) induced by flg22-derived peptides

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