Xylanase Activity of Xanthomonas alfalfae in Culture and during Pathogenesis of Bacterial Leaf Spot of Alfalfa

Ultrastructure of Interactions Between Cassava andXanthomonas campestrispv.manihotis: Cytochemistry of Cellulose and Pectin Degradation in a Susceptible Cultivar

“…c. pv. arfarfae, the bacterial xylanase was demonstrated to play a causal role in pathogenesis (42); in this case, the decrease of plant xylan compounds was correlated with the increase of the bacterial xylanase activity. Although our study lacks biochemical data, this cytochemical investigation provides strong indirect evidence that X C M secretes active cellulases, or hemicellulases, or both, during leaf colonization.…”

“…Plant bacterial pathogens, including Pseudomonas (29), Erwinia (6), and Clavibacter (4) species were also known to alter plant cell wall polymers (17). Cellulase (20,31), endoglucanase (12), and xylanase (42) produced by Xaiithoinonas species may have the potential capacity for degrading host cellulose and hemicellulose, but virulence of cellulase-deficient mutants of X. c. pv. campestris was not significantly less than that of the wild-type strain (21).…”

Xanthomonas

“…alfalfae (Reddy et al, 1974), and p-mannases that are present in X. campestris cultures as cell wall or membrane-bound constituents, but also in the extracellular medium (Dekker and Candy, 1979). alfalfae (Reddy et al, 1974), and p-mannases that are present in X. campestris cultures as cell wall or membrane-bound constituents, but also in the extracellular medium (Dekker and Candy, 1979).…”

Cellulolytic vestiges of the xylanase activity in a new strictly xylanolytic, thermophilic Clostridium sp.

“…Clostridium acetobutylicum (Lee et al, 1985), and Clostridium thermolacticum (Brodel et al, 1990) produce xylanase upon depletion of cellobiose and glucose, respectively. Induction occurs with xylose, xylo-oligomers, xylan, l3-methyl-xyloside, in a variety of organisms, and with galactose (Reddy et al, 1974). The cellulolytic species T longibrachiatum (Royer and Nakas, 1990), Piromyces sp.…”