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Trichoderma harzianum strain 4 produced extracellular xylan-degrading enzymes, namely beta-xylanase, beta-xylosidase and alpha-arabinofuranosidase, when grown in liquid medium cultures containing oat spelt xylan as inducer. Cellulase activity was not detected. The pattern of xylan-degrading enzymes induction was influenced by the form of xylan present in the medium. They were detected in different incubation periods. Electrophoretic separation of the proteins from liquid culture filtrates by SDS-PAGE showed a variety of bands with high and low molecular weights. O fungo Trichoderma harzianum linhagem 4 produziu, enzimas xilanolíticas quando crescido em meios de cultura líquido contendo xilana como indutor. Atividade celulolítica não foi detectada. O tipo de xilana presente no meio de cultura influenciou a indução das enzimas xilanolíticas. As enzimas foram detectadas em diferentes períodos de incubação. SDS-PAGE de amostras de meios de cultura apresentou uma variedade de bandas protéicas com alto e baixo pesos moleculares

Production of xylan-degrading enzymes by a Trichoderma harzianum strain