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LAM2: An Unusual Laminaran Structure for a Novel Plant Elicitor Candidate

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Mirande-Ney, Cathleen | Arnaudin, Quentin | Durambur, Gaëlle | Plasson, Carole | Bernard, Sophie | Chamot, Christophe | Grivotte, Julie | Mati-Baouche, Narimane | Driouich, Azeddine | Brebion, Jeremy | Hennequart, Franck | Lerouge, Patrice | Boulogne, Isabelle

Edité par CCSD ; MDPI -

International audience. Laminarans are of interest because they have been shown to induce various immune responses in animals and plants. These β-D-glucans differ from each other by their branching rate, which is possibly responsible for their biological activities. In the present study, we characterized a laminaran fraction extracted from Laminaria hyperborea and named LAM2 using sugar composition and structural analyses (NMR). Then, we evaluated its activity as a potential plant elicitor in vitro on tomato seedlings using gene expression analysis and cell wall immunofluorescence labeling. Our study showed that LAM2 isolated from L. hyperborea is a succinylated laminaran which significantly enhanced the plant defense of tomato seedlings and induced cell wall modifications, suggesting a higher elicitor activity than the laminaran standard extracted from Laminaria digitata.

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