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首页> 外文期刊>European Journal of Plant Pathology >Fungal species associated with butt rot of mature Scots pine and Norway spruce in northern boreal forests of Northern Ostrobothnia and Kainuu in Finland
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Fungal species associated with butt rot of mature Scots pine and Norway spruce in northern boreal forests of Northern Ostrobothnia and Kainuu in Finland

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摘要

Diversity of fungi was investigated in Scots pine and Norway spruce stumps showing symptoms of butt rot in managed coniferous forests located in the northernmost distribution area of Heterobasidion butt rot in Finland. During a survey of 101 recently clear-cut stands, a total of 479 stumps showing signs of decay were sampled. Fungi were isolated from wood chips taken at the transition zone between healthy and decayed wood. A subsample of 209 isolates from Norway spruce and nine from Scots pine was selected for sequencing ITS-DNA. In Norway spruce 59 species and in Scots pine six fungal species were detected based on >= 98% similarity and 62 genera based on >= 95% similarity with sequences in GenBank. Three sequences did not match to any identified sequence in GenBank. The majority of the isolates (74%) were Ascomycota while 18% were Basidiomycota and 6% Zygomycota. The dominance of Ascomycota over Basidiomycota was pronounced in spruce stumps of stands with a butt rot incidence above 20% and the decayed area was larger in sample discs from which only Ascomycota were isolated than in discs inhabited by Basidiomycota. The result suggests that there is a high site- and/or tree -specific variation of the mycoflora in the Norway spruce decaying butt. Based on these results no single fungal species can be suspected to act as causal agent of butt rot occurring in Norway spruce nor in Scots pine in Northern Ostrobothnia and Kainuu counties.
机译：在苏格兰松树和挪威云杉树桩中调查了真菌的多样性，显示了位于芬兰异常的北部北部最北端分布区域的靶向具植物中的对接腐烂的症状。在最近的101次调查期间，共采样479个树桩，显示出衰变的迹象。真菌从健康和腐朽的木材之间的过渡带拍摄的木屑隔离。选择了来自挪威云杉和来自苏格兰杉木的9个分离株的子样本，用于测序其-DNA。在挪威云杉59种和苏格兰毒液中，基于> = 98％相似性和62属，基于> = 95％与Genbank中的序列相似检测。三个序列与Genbank中的任何识别的序列不匹配。大多数分离株（74％）是ascycota，而18％是碱霉菌和6％的Zygomycota。 Ascomycota对底漆的优势在Pradioomycota的云杉中呈现出来的云杉树桩，腐烂的腐烂发病率高于20％，腐朽的区域在样品盘中较大，其中含有ascoycota的含量差异而不是盆霉素栖息的圆盘。结果表明，在挪威云杉腐烂对接中的Mycoflora的高位和/或树特异性变化。基于这些结果，可以怀疑任何单一的真菌物种作为挪威云杉的屁股腐烂的因果试剂，也不能在北蛇皮炎北部的苏格兰松树和Kainuu县。

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