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Ectomycorrhizal fungal decay traits along a soil nitrogen gradient
New Phytologist ( IF 9.4 ) Pub Date : 2021-09-17 , DOI: 10.1111/nph.17734
Peter T Pellitier 1 , Donald R Zak 1, 2
Affiliation  

  • The extent to which ectomycorrhizal (ECM) fungi decay soil organic matter (SOM) has implications for accurately predicting forest ecosystem response to climate change. Investigating the distribution of gene traits associated with SOM decay among ectomycorrhizal fungal communities could improve understanding of SOM dynamics and plant nutrition. We hypothesized that soil inorganic nitrogen (N) availability structures the distribution of ECM fungal genes associated with SOM decay and, specifically, that ECM fungal communities occurring in inorganic N-poor soils have greater SOM decay potential.
  • To test this hypothesis, we paired amplicon and shotgun metagenomic sequencing of 60 ECM fungal communities associating with Quercus rubra along a natural soil inorganic N gradient.
  • Ectomycorrhizal fungal communities occurring in low inorganic N soils were enriched in gene families involved in the decay of lignin, cellulose, and chitin. Ectomycorrhizal fungal community composition was the strongest driver of shifts in metagenomic estimates of fungal decay potential. Our study simultaneously illuminates the identity of key ECM fungal taxa and gene families potentially involved in the decay of SOM, and we link rhizomorphic and medium-distance hyphal morphologies with enhanced SOM decay potential.
  • Coupled shifts in ECM fungal community composition and community-level decay gene frequencies are consistent with outcomes of trait-mediated community assembly processes.


中文翻译:

沿土壤氮梯度的外生菌根真菌腐烂性状

  • 外生菌根 (ECM) 真菌腐烂土壤有机质 (SOM) 的程度对于准确预测森林生态系统对气候变化的响应具有重要意义。研究外生菌根真菌群落中与 SOM 衰变相关的基因性状分布可以提高对 SOM 动态和植物营养的理解。我们假设土壤无机氮 (N) 可用性构建了与 SOM 衰变相关的 ECM 真菌基因的分布,特别是,发生在无机 N 贫瘠土壤中的 ECM 真菌群落具有更大的 SOM 衰变潜力。
  • 为了验证这一假设,我们对沿天然土壤无机氮梯度的 60 个与红相关的 ECM 真菌群落进行了扩增子和鸟枪法宏基因组测序。
  • 低无机氮土壤中的外生菌根真菌群落富含参与木质素、纤维素和几丁质腐烂的基因家族。外生菌根真菌群落组成是真菌衰变潜力宏基因组估计变化的最强驱动力。我们的研究同时阐明了可能参与 SOM 衰变的关键 ECM 真菌类群和基因家族的身份,我们将根际和中距离菌丝形态与增强的 SOM 衰变潜力联系起来。
  • ECM 真菌群落组成和群落水平衰减基因频率的耦合变化与性状介导的群落组装过程的结果一致。
更新日期:2021-11-03
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