Structural and biological features of a hydrogel from seed coats of Chorisia speciosa

A galactan, in which the main chain is β-(1→4), reduces attachment of conidial suspensions Colletotrichum graminicola both to inert and biotic surfaces. Seed coats from Chorisia speciosa form a hydrogel on contact with water. When the hydrogel was solubilized and the solution centrifuged, subsequent...

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Bibliographic Details
Published in:Phytochemistry (Oxford) 2002-09, Vol.61 (2), p.157-163
Main Authors: Beleski-Carneiro, Eliana, Sugui, Janyce A, Reicher, Fany
Format: Article
Language:English
Subjects:
Acidic galactan
Biological and medical sciences
Bombacaceae
Cell Adhesion - drug effects
Chemical constitution
Chemical control
Chorisia speciosa
Chromatography, Gel
Colletotrichum - drug effects
Colletotrichum - physiology
Control
Fundamental and applied biological sciences. Psychology
Fungal plant pathogens
Hydrogel
Hydrogel, Polyethylene Glycol Dimethacrylate - chemistry
Hydrogel, Polyethylene Glycol Dimethacrylate - pharmacology
Magnetic Resonance Spectroscopy
Molecular Weight
Phytopathology. Animal pests. Plant and forest protection
Plant Diseases - microbiology
Plant Leaves - microbiology
Plant physiology and development
Plants - chemistry
Polysaccharides - chemistry
Polysaccharides - pharmacology
Seed polysaccharides
Seeds - chemistry
Zea mays - microbiology
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Summary:A galactan, in which the main chain is β-(1→4), reduces attachment of conidial suspensions Colletotrichum graminicola both to inert and biotic surfaces. Seed coats from Chorisia speciosa form a hydrogel on contact with water. When the hydrogel was solubilized and the solution centrifuged, subsequent ethanol precipitation gave a polysaccharide (F-I) composed of rhamnose, galactose and uronic acid in a molar ratio of 25:44:31. Analysis of F-I by HPSEC-MALLS showed a homogenous polymer with high molecular weight. It consisted of a main chain of (1→4)-linked β-galactopyranosyl units as indicated by NMR spectral and methylation data analysis, with rhamnose, galactose and glucuronic acid as non-reducing end units. This fraction interfered with adhesion of Colletotrichum graminicola, a causal agent of anthracnose, to polystyrene slides and to leaves of corn, thus delaying infection in the latter.
ISSN:0031-9422
1873-3700
DOI:10.1016/S0031-9422(02)00227-3