Laccase activities of a soil fungus Penicillium simplicissimum in relation to lignin degradation
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The laccase activities of Penicillium simplicissimum H5 during solid-state fermentation with rice straw were studied. Degradation of lignocellulose was also followed. Results showed that all supplemental carbon sources inhibited the laccase activity in different degrees, while suitable concentrations of supplemental nitrogen sources remarkably enhanced the laccase activity. The enhancement of activity by the ordinary laccase inducers 2, 2′-azino-bis(3-ethylbenzthiazoline-6-sulfonic acid) and xylidine was not observed in this study. Lignocellulose degradation was improved when laccase activity was relatively low, suggesting a polymerizing function of laccase in lignin degradation by P. simplicissimum.
KeywordsLaccase lignin lignocellulose Penicillium simplicissimum solid-state fermentation
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The study was financially supported by the National Natural Science Foundation of China (Grant No.70171055, 50179011), the Natural Foundation for Distinguished Young Scholars (50225926), the Doctoral Foundation of Ministry of Education of China (20020532017), the Teaching and Research Award Program for Outstanding Young Teachers in Higher Education Institutions of MOE, P.R.C. (TRAPOYT) in 2000 and the National 863 High Technology Research Program of China (2001AA644020, 2003AA644010 and 2004AA649370).
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