Szymczak Aleksandra, Ryo Masahiro, Roy Julien, Rillig Matthias C
Institute of Biology, Freie Universität Berlin, Berlin, Germany.
Berlin-Brandenburg Institute of Advanced Biodiversity Research, Berlin, Germany.
Front Microbiol. 2020 Jun 19;11:1326. doi: 10.3389/fmicb.2020.01326. eCollection 2020.
As a consequence of ongoing climate change, the frequency of extreme heat events is expected to increase. Recurring heat pulses may disrupt functions supported by soil microorganisms, thus affecting the entire ecosystem. However, most perturbation experiments only test effects of single heat events, and therefore it remains largely unknown how soil microorganisms react to repeated pulse events. Here we present data from a lab experiment exposing 32 filamentous fungi, originally isolated from the same soil, to sequential heat perturbations. Soil saprobic fungi isolates were exposed to one or two heat pulses: mild (35°C/2 h), strong (45°C/1 h), or both in sequence (35°C/2 h+45°C/1 h), and we assessed growth rate. Out of the 32 isolates 13 isolates showed an antagonistic response, 3 isolates a synergistic response and 16 isolates responded in an additive manner. Thus the 32 filamentous fungal isolates used here showed the full range of possible responses to an identical heat perturbation sequence. This diversity of responses could have consequences for soil-borne ecosystem services, highlighting the potential importance of fungal biodiversity in maintaining such services, particularly in the context of climate change.
由于持续的气候变化，极端高温事件的频率预计将会增加。反复出现的热脉冲可能会扰乱土壤微生物所支持的功能，从而影响整个生态系统。然而，大多数扰动实验仅测试单次热事件的影响，因此，土壤微生物如何对重复脉冲事件做出反应在很大程度上仍然未知。在此，我们展示了一项实验室实验的数据，该实验将最初从同一土壤中分离出的32种丝状真菌暴露于连续的热扰动中。土壤腐生真菌分离株被暴露于一次或两次热脉冲下：轻度（35°C/2小时）、强烈（45°C/1小时），或依次暴露于两者（35°C/2小时 + 45°C/1小时），并且我们评估了生长速率。在这32个分离株中，13个分离株表现出拮抗反应，3个分离株表现出协同反应，16个分离株表现出累加反应。因此，这里使用的32种丝状真菌分离株对相同的热扰动序列表现出了所有可能的反应。这种反应的多样性可能会对土壤生态系统服务产生影响，突出了真菌生物多样性在维持此类服务中的潜在重要性，特别是在气候变化的背景下。
