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散斑壳菌对华山松凋落针叶的室内分解

DOI: 10.3969/j.issn.1000-2006.2014.03.015, PP. 77-82

Keywords: 散斑壳属真菌,华山松,凋落针叶,纤维素酶,微生物分解

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Abstract:

为了探明散斑壳菌(lophodermiumspp.)分解利用针叶时的各纤维素酶酶解的作用机制和了解该菌的腐生性能,以华山松(pinusarmandii)新近凋落针叶为底物进行纯培养分解试验。试验以针叶为唯一碳源,采用试管培养液法,对lophodermiumconigenum、l.pinastri、l.kumaunicum、l.sichuanense和l.erlangshanense5种散斑壳菌进行纯培养试验,同时测定针叶失重率和纤维素酶酶活大小。相关性分析表明,内切纤维素酶(endoglucanase,eg)、外切纤维素酶(cellobiohydrolase,cbh)与β-葡萄糖苷酶(β-glucosidase,bgl)三者之间存在一定协同效应(l.pinastri与l.erlangshanense除外),特别是cbh与eg之间。各酶类活性大小是制约针叶纤维素分解的主要因素,协同效应强酶活高凋落针叶分解就越快。5种菌引起针叶质量损失率在8.5%~11.8%之间,各菌株引起针叶质量损失依次为l.pinastri>l.sichuanense>l.kumaunicum>l.conigenum>l.erlangshanense。5种菌均能分泌纤维素酶,对凋落针叶有一定分解能力,且eg、cbh与bgl之间存在不同程度的协同作用,属于兼性寄生物,但其腐生性不强。

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