Patterns of laccase and peroxidases in coarse woody debris of Fagus sylvatica, Picea abies and Pinus sylvestris and their relation to different wood parameters

被引:26
作者
Arnstadt, Tobias [1 ]
Hoppe, Bjoern [2 ,3 ]
Kahl, Tiemo [3 ]
Kellner, Harald [1 ]
Krueger, Dirk [2 ]
Baessler, Claus [4 ]
Bauhus, Juergen [3 ]
Hofrichter, Martin [1 ]
机构
[1] Tech Univ Dresden, Int Inst Zittau, Dept Bio & Environm Sci, Zittau, Germany
[2] UFZ Helmholtz Ctr Environm Res, Dept Soil Ecol, Halle, Saale, Germany
[3] Univ Freiburg, Fac Environm & Nat Resources, Chair Silviculture, Hugstetter Str 55, D-79106 Freiburg, Germany
[4] Bavarian Forest Natl Pk, Freyunger Str 2, D-94481 Grafenau, Germany
关键词
Laccase; Manganese peroxidase; General peroxidase Dead wood; Lignin; Wood rot; LIGNIN-MODIFYING ENZYMES; SMALL-SCALE VARIATION; MANGANESE PEROXIDASE; INTERSPECIFIC INTERACTIONS; SPATIAL-DISTRIBUTION; COMMUNITY STRUCTURE; HEAVY-METALS; LAND-USE; ROT; DEGRADATION;
D O I
10.1007/s10342-015-0920-0
中图分类号
S7 [林业];
学科分类号
0829 ; 0907 ;
摘要
Lignin and its degradation, particularly in forest ecosystems, play a major role in the global carbon cycle. Filamentous fungi equipped with extracellular oxidoreductases (oxidative enzymes), i.e., laccase, manganese-dependent peroxidases and several other peroxidases, are the key players in the bioconversion of lignin. In particular, for coarse woody debris (CWD), this process is poorly understood and the activities of laccase and peroxidases have never been studied on a large field scale. We investigated the activities of these enzymes in 701 samples of Fagus sylvatica, Picea abies and Pinus sylvestris CWD across three regions in Germany and analyzed their dependence on pH, water content, wood density, total lignin, organic extractives, metals, water-soluble lignin fragments and fungal species richness. Respective enzyme activities were present in 79 % of all samples, and the activities were highly variable and more frequent in F. sylvatica than in coniferous wood. Logistic regressions and correlations between enzyme activities and the variables revealed that the fungal community structure and the amount of water-soluble lignin fragments are most important determinants, and that the prevalent acidic pH in CWD is suitable to facilitate laccase and manganese peroxidase activities. Concentrations of metals (manganese, copper, iron) were sufficient to ensure synthesis and functioning of relevant enzymes. Based on this large field study, we conclude that laccase and peroxidases in CWD are highly relevant for lignin degradation, but the variable pattern of their secretion is the result of a complex array of wood parameters and the fungal community structure, which could only partly be resolved.
引用
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页码:109 / 124
页数:16
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