Seasonal patterns of growth, alginate content and block structure of the alien invader Sargassum muticum (Fucales, Ochrophyta) from the Atlantic coast of Morocco-Reference-Cited by-同舟云学术

Seasonal patterns of growth, alginate content and block structure of the alien invader Sargassum muticum (Fucales, Ochrophyta) from the Atlantic coast of Morocco

Published:2021-12-07 Issue:1 Volume:65 Page:69-78
ISSN:0006-8055
Container-title:Botanica Marina
language:en
Short-container-title:

Author:

Belattmania Zahira¹^ORCID,El Atouani Samir¹,Bentiss Fouad²³,Jama Charafeddine³,Falace Annalisa⁴,Chaouti Abdellatif¹,Reani Abdeltif¹,Sabour Brahim¹

Affiliation:

1. Phycology, Blue Biodiversity and Biotechnology RU, Laboratory of Plant Biotechnology, Ecology and Ecosystem Valorization—CNRST Labeled Research Unit N°10, Faculty of Sciences, University Chouaib Doukkali , P.O. Box 20 , 24000 El Jadida , Morocco

2. Laboratory of Catalysis and Corrosion of Materials , Faculty of Sciences, Chouaïb Doukkali University , P.O. Box 20 , El Jadida M-24000 , Morocco

3. UMET—Unité Matériaux et Transformations , Centrale Lille, UMR 8207, University of Lille, CNRS, INRAE , F-59000 Lille , France

4. Department of Life Sciences , University of Trieste , Via L. Giorgieri 10 , 34127 Trieste , Italy

Abstract

Abstract In the present study, alginate yield and composition were investigated during the seasonal life cycle of the alien brown alga Sargassum muticum harvested from the Atlantic coast of Morocco. Alginate yield ranged from 11.14% in winter to 25.62% in spring/early summer, coinciding with maximum vegetative growth. Monthly monitoring of the alginate block structure showed that the highest mannuronate (M)/guluronate (G) ratio was recorded during the maximum development of S. muticum, before sexual maturity and during resumption of vegetative growth, giving maximum flexibility to the alga. The unusually high molar monad fractions (FG) and dyad fractions (FGG) of guluronic acid in late summer/early autumn appeared to be related to stiffness of senescent thalli. Rheological characterisation showed that the alginate of S. muticum exhibited pseudoplastic behaviour, with the highest apparent viscosities measured in late summer/early autumn when the G blocks dominated the alginate structure. This study suggests that S. muticum could be exploited as an alginophyte for commercial applications. The best harvest time is May-June, which corresponds to the highest alginate yield, maximum thallus growth, and largely completed sexual reproduction, ensuring sustainable exploitation of the species.

Publisher

Walter de Gruyter GmbH

Subject

Plant Science,Aquatic Science,Ecology, Evolution, Behavior and Systematics

Link

https://www.degruyter.com/document/doi/10.1515/bot-2021-0050/pdf

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