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• W1970148634 abstract "Healthy and Verticillium albo-atrum-infected tomato plants were shown to possess a constitutive enzyme capable of hydrolysing chitin of N-acetylglucosamine. It was present in leaf, stem and root tissue extracts, vacuum extracted xylem sap and to a lesser extent in the bleeding exudate. The partially purified enzyme showed optimal activity between pH 5·4 and 5·8 and at a temperature of 28°C. The Km and Vmax values for chitin were 0·408 mg/ml and 3·7 μg N-acetylglucosamine N/h ml respectively. No free hexosamines were detected in healthy or diseased plants. Authentic lysozyme and β-glucosidase showed slight chitinase activity. Only trace amounts of lysozyme activity could be detected in tissue extracts. Crude extracts possessed high β-glucosidase and low chitinase activities; after partial purification the β-glucosidase activity was negligible while chitinase activity increased tenfold. Chitinases from Streptomyces and V. albo-atrum and the tomato enzyme responded identically to selected inhibitors. Inoculation of tomato cultivars with isolates of V. albo-atrum from hop and tomato gave a range of disease expression from susceptible to resistant. Infection resulted in a significant increase in chitinase activity which was greater in the susceptible reaction. The apparent pH of xylem exudate from diseased plants (6·8 to 7·1) was too high for appreciable enzyme activity. The activity of host polysaccharases is discussed in relation to the well-documented in vivo lysis of plant pathogens." @default.
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• W1970148634 date "1973-04-01" @default.
• W1970148634 modified "2023-09-26" @default.
• W1970148634 title "Chitinase activity in Lycopersicon esculentum and its relationship to the in vivo lysis of Verticillium albo-atrum mycelium" @default.
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• W1970148634 doi "https://doi.org/10.1016/0048-4059(73)90083-0" @default.
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