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1. (Article ID: 6843)
 
Corsaro MM, De Castro C, Evidente A, Lanzetta R, Molinaro A, Mugnai L, Parrilli M, Surico G
Chemical structure of two phytotoxic exopolysaccharides produced by Phomopsis foeniculi
Carbohydrate Research 308(3-4) (1998) 349-357
 

The two main exocellular polysaccharides produced in vitro by Phomopsis foeniculi, a fungal pathogen of fennel, were isolated and characterized by chemical and spectroscopic methods as a galactan with the known structure [→6)-β-D-Galf-(1→5)-β-D- Galf-(1→5)-β-D-Galf-(1→]n and a mannan. The latter consists of a backbone of α-(1→6)-linked mannopyranose units. Almost all of these are branched at the 2 position with arms containing 2- and 3-linked mannopyranose units. The crude polysaccharide fraction and its components, galactan and mannan, showed phytotoxic effects, i.e. chlorosis, necrosis and/or wilting, on fennel and on two non-host plants, tobacco and tomato.

structure, exopolysaccharide, exopolysaccharides, chemical, chemical structure, mannan, Galactan, phytotoxicity, fungi, Phomopsis foeniculi

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