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Relationships between Swiss needle cast and ectomycorrhizal fungus diversity

机译：瑞士针铸法与外生菌根真菌多样性之间的关系

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摘要

Swiss needle cast (SNC) is a disease specific to Douglas-fir (Pseudotsuga menziesii) caused by the ascomycete Phaeocryptopus gaeumannii. Here we examine characteristics of the EM fungus community that are potentially useful in predictive models that would monitor forest health. We found that mean EM density (number of colonized root tips/soil core) varied nearly 10-fold among sites of varying levels of SNC, while mean EM fungus species richness (number of species/soil core) varied by about 2.5 times. Strong relationships were found between EM and SNC parameters: EM species richness was positively correlated with both Douglas-fir needle retention (R-2 = 0.93) and EM density (R-2 = 0.65); EM density also was significantly correlated with Douglas-fir needle retention (R-2 = 0.70). These simple characteristics of the EM fungus community could be used to monitor forest health and generate predictive models of site suitability for Douglas-fir. Based on previous findings that normally common EM types were reduced in frequency on sites with severe SNC, we also hypothesized that some EM fungi would be stress tolerant-dominant species. Instead, we found that various fungi were able to form EM with the stressed trees, but none were consistently dominant across samples in the severely diseased areas
机译：瑞士针铸（SNC）是道格拉斯冷杉（Pseudotsuga menziesii）特有的疾病，是由子囊菌Phaeocryptopus gaeumannii引起的。在这里，我们研究了EM真菌群落的特征，这些特征在监测森林健康的预测模型中可能有用。我们发现，在不同水平的SNC中，平均EM密度（定殖根尖/土壤核心的数量）变化了近10倍，而平均EM真菌物种丰富度（物种/土壤核心的数量）变化了约2.5倍。 EM和SNC参数之间存在很强的关系：EM物种丰富度与道格拉斯冷杉针保留率（R-2 = 0.93）和EM密度（R-2 = 0.65）均呈正相关。 EM密度也与花旗冷杉针保留率显着相关（R-2 = 0.70）。 EM真菌群落的这些简单特征可用于监测森林健康并生成花旗松适宜性的预测模型。根据以前的发现，在严重SNC部位，通常常见的EM类型的频率降低，我们还假设某些EM真菌将是胁迫耐受性强的物种。取而代之的是，我们发现各种真菌都可以与受压树木形成EM，但是在重病地区的所有样本中，没有一种真菌始终占优势

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