title: Production of cellulase (Cx) by different species of Erwinia.
abstract: The tested isolates of Erwinia chrysanthemi (corn pathotype) and E. carotovora constitutively produce high levels of cellulase(s) (Cx) in presence or absence of carboxymethyl-cellulose (CMC) as substrate in the medium. The tested isolates of E. atroseptica produced high levels of cellulase when grown in presence of both carboxymethyl-cellulose (CMC) and sucrose, low levels in presence of carboxymethyl-cellulose alone, and traces of cellulase(s) in presence of sucrose alone. The activity of cellulase(s), present in culture supernatants of E. chrysanthemi (corn pathotype) and E. carotovora, occurred in a broad range of pH value (2.2--9) with an optimum pH ranging from pH 4 to 7. However, the activity of cellulase(s), present in culture supernatant of E. atroseptica, occurred in a narrow range of pH value (3--7) with an optimum of about pH 5.
mesh_terms: D002266:Carboxymethylcellulose Sodium / Q000378:metabolism; D002480:Cellulase / Q000096:biosynthesis* / Q000378:metabolism; D004885:Erwinia / Q000201:enzymology* / Q000378:metabolism; D006863:Hydrogen-Ion Concentration; D010935:Plant Diseases; D010944:Plants / Q000382:microbiology; D013045:Species Specificity; D013395:Sucrose / Q000378:metabolism
chemical_list: D013395:Sucrose; D002480:Cellulase; D002266:Carboxymethylcellulose Sodium