Developing climate-smart restoration: Can plant microbiomes be hardened against heat waves?
Developing climate-smart restoration: Can plant microbiomes be hardened against heat waves?
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DOI：
10.1002/eap.1763
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发表时间：
2018-07
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影响因子：
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通讯作者：
Rachel L. Rubin;G. Koch;Ayla Martinez;Rebecca L. Mau;M. Bowker;B. Hungate
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作者：
Rachel L. Rubin;G. Koch;Ayla Martinez;Rebecca L. Mau;M. Bowker;B. Hungate
热浪的频率和强度正在增加，对本已困难的生态恢复实践提出了挑战。我们研究了在恢复环境中，预热当地根际土壤(接种物)是否能使植物适应田间施加的热浪。室内土壤加热使根际细菌群落组成发生明显变化，物种均匀度增加。此外，预热根际土壤还降低了温室内C4草Bouteloua gracilis(Bouteloua Gracilis)的株高、叶片数和枝条质量，降低了C3草Festuca arizonica(Festuca Arizonica)的枝质量。在移栽和施加场热波后，预热的接种物对两种植物的热波存活都没有影响。然而，在物种水平上对田间热浪有很强的响应。例如，蓝色格拉玛的热浪存活率(92%)是亚利桑那州羊茅(22%)的四倍多。这些结果表明，对于热浪风险较高的地点，使用C4种子可能是更可取的。还需要进一步的研究来了解接种是否在高度退化的土壤中比在部分退化的土壤中更有效。
Heat waves are increasing in frequency and intensity, presenting a challenge for the already difficult practice of ecological restoration. We investigated whether pre-heating locally sourced rhizosphere soil (inoculum) could acclimatize plants to a field-imposed heat wave in a restoration setting. Soil heating in the laboratory caused a marked shift in rhizosphere bacterial community composition, accompanied by an increase in species evenness. Furthermore, pre-heated rhizosphere soil reduced plant height, number of leaves, and shoot mass of the C4 grass, blue grama (Bouteloua gracilis), and it reduced the shoot mass of the C3 grass, Arizona fescue (Festuca arizonica) in the glasshouse. Following transplantation and the application of a field heat wave, pre-heated inoculum did not influence heat wave survival for either plant species. However, there were strong species-level responses to the field heat wave. For instance, heat wave survivorship was over four times higher in blue grama (92%) than in Arizona fescue (22%). These results suggest that the use of C4 seeds may be preferable for sites exhibiting high heat wave risk. Further research is needed to understand whether inocula are more effective in highly degraded soil in comparison with partially degraded soils.