On estates, the rubber-tree, Hevea brasiliensis, is subject to a variety of diseases. Among them,... more On estates, the rubber-tree, Hevea brasiliensis, is subject to a variety of diseases. Among them, root rots caused by Rigidoporus lignosus and Phellinus noxius are responsible for severe losses. When these parasites infect the roots they induce an increase in the peroxidase ...
The abilities of white-rotting fungi to depolymerize lignin and to excrete laccases (p-diphenolox... more The abilities of white-rotting fungi to depolymerize lignin and to excrete laccases (p-diphenoloxidases), though brown-rotting fungi do not present these two biological properties, are the main differences between these two types of rotting fungi. Therefore it was assumed that the lignin scission was a result of
The distribution of N-acetylglucosamine residues in the cell wall of the white-rot pathogenic fun... more The distribution of N-acetylglucosamine residues in the cell wall of the white-rot pathogenic fungus, Rigidoporus lignosus, was studied by using gold labelled wheatgerm agglutinin bound to ovomucoid-colloidal gold. Ultrastructural investigation of R. lignosus-infected root ...
A study on biochemical mechanisms of the rubber tree aggression by two root rotting fungi Rigidop... more A study on biochemical mechanisms of the rubber tree aggression by two root rotting fungi Rigidoporus lignosus and Phellinus noxius was earned out. The activity of eight enzymes and their spatial distribution in adult tap root tissues were measured. Finally their origin, host or parasite, and physiological signification in the pathogenic process were discussed.
Abstract The culture filtrate of Rigidoporus lignosus and Phellinus nozius exhibit endoand exo-gl... more Abstract The culture filtrate of Rigidoporus lignosus and Phellinus nozius exhibit endoand exo-glucanase as well as cellobiase activities. A very weak pectinolytic activity wits detected in the R. lignosus culture filtrate whereas P. nosius showed both a pectinase (endo-PG) ...
Plant survival to biotic stresses results from various defence strategies. Depending on the patho... more Plant survival to biotic stresses results from various defence strategies. Depending on the pathogen and nature of the parasitism, a plant will adapt its responses through a fine tuning regulation of defence mechanisms under the control of its hormones whose functions will be reoriented. Salicylic acid, jasmonic acid and ethylene drive signalling pathways, the role of which is well established in plant resistance. However, additional hormones, including abscisic acid, seem to have an essential role in plant defence regulation. Crosstalk and coordination of these signalling pathways are key elements for the expression of optimized plant resistance to pathogens.
On estates, the rubber-tree, Hevea brasiliensis, is subject to a variety of diseases. Among them,... more On estates, the rubber-tree, Hevea brasiliensis, is subject to a variety of diseases. Among them, root rots caused by Rigidoporus lignosus and Phellinus noxius are responsible for severe losses. When these parasites infect the roots they induce an increase in the peroxidase ...
The abilities of white-rotting fungi to depolymerize lignin and to excrete laccases (p-diphenolox... more The abilities of white-rotting fungi to depolymerize lignin and to excrete laccases (p-diphenoloxidases), though brown-rotting fungi do not present these two biological properties, are the main differences between these two types of rotting fungi. Therefore it was assumed that the lignin scission was a result of
The distribution of N-acetylglucosamine residues in the cell wall of the white-rot pathogenic fun... more The distribution of N-acetylglucosamine residues in the cell wall of the white-rot pathogenic fungus, Rigidoporus lignosus, was studied by using gold labelled wheatgerm agglutinin bound to ovomucoid-colloidal gold. Ultrastructural investigation of R. lignosus-infected root ...
A study on biochemical mechanisms of the rubber tree aggression by two root rotting fungi Rigidop... more A study on biochemical mechanisms of the rubber tree aggression by two root rotting fungi Rigidoporus lignosus and Phellinus noxius was earned out. The activity of eight enzymes and their spatial distribution in adult tap root tissues were measured. Finally their origin, host or parasite, and physiological signification in the pathogenic process were discussed.
Abstract The culture filtrate of Rigidoporus lignosus and Phellinus nozius exhibit endoand exo-gl... more Abstract The culture filtrate of Rigidoporus lignosus and Phellinus nozius exhibit endoand exo-glucanase as well as cellobiase activities. A very weak pectinolytic activity wits detected in the R. lignosus culture filtrate whereas P. nosius showed both a pectinase (endo-PG) ...
Plant survival to biotic stresses results from various defence strategies. Depending on the patho... more Plant survival to biotic stresses results from various defence strategies. Depending on the pathogen and nature of the parasitism, a plant will adapt its responses through a fine tuning regulation of defence mechanisms under the control of its hormones whose functions will be reoriented. Salicylic acid, jasmonic acid and ethylene drive signalling pathways, the role of which is well established in plant resistance. However, additional hormones, including abscisic acid, seem to have an essential role in plant defence regulation. Crosstalk and coordination of these signalling pathways are key elements for the expression of optimized plant resistance to pathogens.
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