Nutrient and stress tolerance traits linked to fungal responses to global change
Nutrient and stress tolerance traits linked to fungal responses to global change
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DOI：
10.1525/elementa.2020.00144
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发表时间：
2021-01
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影响因子：
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通讯作者：
K. Treseder;C. Alster;L. Cat;M. Gorris;A. Kuhn;Karissa G. Lovero;F. Hagedorn;J. Kerekes;T. McHugh;E. Solly
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作者：
K. Treseder;C. Alster;L. Cat;M. Gorris;A. Kuhn;Karissa G. Lovero;F. Hagedorn;J. Kerekes;T. McHugh;E. Solly
在本案例分析中，我们确定了真菌性状与分类群对4个全球变化因子的响应相关：CO2升高、变暖和干燥、降水增加和氮(N)富集。我们开发了一个基于性状的框架，预测随着全球变化增加对特定营养物质的限制，具有针对该营养物质的性状的真菌分类群将占群落的更大比例（反之亦然）。此外，我们预计增温干燥和富氮会对真菌产生环境胁迫，并可能选择耐胁迫性状。我们通过分析先前发表的野外操作的真菌群落数据，并将分类群与mycocomsm真菌门户网站的功能基因性状联系起来，对该框架进行了测试。总体而言，真菌属倾向于对全球变化的3个要素做出类似的反应：降水增加、N富集和变暖和干燥。在这些变化下繁殖的属也倾向于拥有抗压力的功能基因，这表明这些全球变化——甚至降水的增加——可能导致了环境压力，从而选择了某些分类群。此外，这些属没有表现出很强的C分解和P获取能力，因此在全球变化下，随着真菌群落组成的变化，土壤C周转量可能会减慢或保持不变。由于我们没有发现强有力的证据表明营养限制选择的变化对具有更多限制性营养的性状的分类群有影响，我们修改了基于性状的框架。该框架将真菌类群分为抗逆性类群和抗逆性类群，并将降水增加、气候变暖和干旱、氮富集等全球变化因素作为抗逆性类群的选择。
In this case study analysis, we identified fungal traits that were associated with the responses of taxa to 4 global change factors: elevated CO2, warming and drying, increased precipitation, and nitrogen (N) enrichment. We developed a trait-based framework predicting that as global change increases limitation of a given nutrient, fungal taxa with traits that target that nutrient will represent a larger proportion of the community (and vice versa). In addition, we expected that warming and drying and N enrichment would generate environmental stress for fungi and may select for stress tolerance traits. We tested the framework by analyzing fungal community data from previously published field manipulations and linking taxa to functional gene traits from the MycoCosm Fungal Portal. Altogether, fungal genera tended to respond similarly to 3 elements of global change: increased precipitation, N enrichment, and warming and drying. The genera that proliferated under these changes also tended to possess functional genes for stress tolerance, which suggests that these global changes—even increases in precipitation—could have caused environmental stress that selected for certain taxa. In addition, these genera did not exhibit a strong capacity for C breakdown or P acquisition, so soil C turnover may slow down or remain unchanged following shifts in fungal community composition under global change. Since we did not find strong evidence that changes in nutrient limitation select for taxa with traits that target the more limiting nutrient, we revised our trait-based framework. The new framework sorts fungal taxa into Stress Tolerating versus C and P Targeting groups, with the global change elements of increased precipitation, warming and drying, and N enrichment selecting for the stress tolerators.