Fucoidans of Moroccan Brown Seaweed as Elicitors of Natural Defenses in Date Palm Roots

• Published in: Marine drugs Vol. 18; no. 12; p. 596
• Main Authors: Bouissil, Soukaina, Alaoui-Talibi, Zainab El, Pierre, Guillaume, Rchid, Halima, Michaud, Philippe, Delattre, Cédric, El Modafar, Cherkaoui
• Format: Journal Article
• Language: English
• Published: Switzerland MDPI AG 26-11-2020; MDPI
• Subjects: Algae; Alginates; Ammonia; Analytical methods; Bifurcations; Biochemistry; Biochemistry, Molecular Biology; Biological control; Biological Control Agents - isolation & purification; Biological Control Agents - pharmacology; Biostimulants; Chemical and Process Engineering; Engineering Sciences; Enzymes; Fucus - metabolism; Galactose; Gas chromatography; Infrared spectroscopy; Life Sciences; Lignin; Lignin - metabolism; Magnetic resonance spectroscopy; Mannose; Mass spectrometry; Mass spectroscopy; Metabolism; Molecular Structure; natural defenses; NMR; NMR spectroscopy; Nuclear magnetic resonance; phenolic metabolism; Phenols; Phenols - metabolism; Phenylalanine; Phenylalanine ammonia-lyase; Phenylalanine Ammonia-Lyase - metabolism; Phoeniceae - drug effects; Phoeniceae - metabolism; Plant Diseases - prevention & control; Plant Roots - drug effects; Plant Roots - metabolism; Polysaccharides; Polysaccharides - isolation & purification; Polysaccharides - pharmacology; Rhamnose; Roots; Saccharides; Seaweed - metabolism; Seaweed meal; Seaweeds; Size exclusion chromatography; Structure-Activity Relationship; Sugar; sulfated polysaccharides; Sulfates; Water purification; sulfated polysaccharides; natural defenses; phenylalanine ammonia-lyase; phenolic metabolism
• ISSN: 1660-3397; 1660-3397
• DOI: 10.3390/MD18120596

Fucoidans from Moroccan brown seaweed
and
were tested for their elicitor activity after their purification and complete characterization. The fucoidans of
(BBF) and of
(FSF) were extracted and purified then characterized by infrared spectroscopy, proton nuclear magnetic resonance spectroscopy and size exclusion chromatography. The results show that BBF and FSF are mainly sulfated with 45.49 and 49.53% (
/
) sulfate, respectively. Analysis of neutral sugars determined by gas chromatography-mass spectrometry showed that FSF and BBF were mainly composed of 64% and 91% fucose and 20% and 6% galactose, respectively, with a few other sugars such as glucose (8% in FSF), rhamnose (1% in BBF) and mannose (8% in FSF and, 2% in BBF). The eliciting activity of these sulfated polysaccharides in stimulating the natural defenses of the date palm was evaluated through the activity of phenylalanine ammonia-lyase (PAL), and the increase in phenols and lignin content in the roots. The results obtained clearly show that the two fucoidans early and intensely stimulate the natural defenses of the date palm after 24 h of treatments. This remarkable elicitor effect seems to be linked to the sulfated groups compared to non-sulfate alginates extracted from the same algae. These results open promising perspectives for a biological control approach against date palm diseases.