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Effects of Plant-Soil Feedback on Switchgrass Productivity Related to Microbial Origin
Agronomy ( IF 3.949 ) Pub Date : 2020-11-26 , DOI: 10.3390/agronomy10121860
James R. Kiniry , Caroline E. Arthur , Katherine M. Banick , Felix B. Fritschi , Yanqi Wu , Christine V. Hawkes

A great deal of effort has been applied to maximizing switchgrass (Panicum virgatum L.) production for bioenergy by leveraging existing local adaptation to climate and via nutrient management in this perennial grass crop. However, the biotic component of soils can also affect plant production and long-term suitability at a given site. Here, we tested how productivity of four switchgrass cultivars were affected by four microbial sources from the Great Plains. All inoculum soil sources were previously conditioned by a mixture of switchgrass cultivars, allowing us to explicitly address plant-soil feedback effects. Microbial soil inocula were added to a consistent background soil to avoid physicochemical variation across the sources. We found that the soil microbial inoculum source mattered more than cultivar in determining switchgrass biomass. The addition of microbes resulted in smaller plants, with the largest plants found on control soils with no inoculum, but some inocula were less negative than others. There was no geographic matching between cultivars and soil microbial inoculum, suggesting little local adaptation to the biotic component of soils. In addition, measurements of fungal root colonization suggest that fungi are not responsible for the observed patterns. Based on these results, we suggest that switchgrass cultivation could benefit from considering effects of the soil biota. Additional work is needed to generalize these patterns over time, to a wider geographic area, and to a broader range of cultivars.

中文翻译:

植物-土壤反馈对与微生物起源相关的柳枝Product生产力的影响

为了最大化柳枝((Panicum virgatumL.)利用这种多年生草料作物对气候的现有适应性以及通过养分管理来生产生物能源。但是,土壤中的生物成分也会影响给定地点的植物产量和长期适应性。在这里,我们测试了来自大平原的四种微生物来源如何影响四个柳枝switch品种的生产力。以前,所有接种土壤的来源都由柳枝栽培种的混合物调节,这使我们能够明确解决植物-土壤反馈的影响。将微生物土壤接种物添加到一致的背景土壤中,以避免整个来源的物理化学变化。我们发现在确定柳枝source生物量方面,土壤微生物接种物源比品种更重要。微生物的添加导致植物变小,在没有接种物的对照土壤中发现了最大的植物,但有些接种物的阴性程度要低于其他接种物。品种与土壤微生物接种物之间没有地理上的匹配,这表明对土壤生物成分的局部适应性很小。另外,对真菌根定植的测量表明真菌与观察到的模式无关。根据这些结果,我们认为柳枝cultivation的种植可以从土壤生物区系的影响中受益。随着时间的推移,需要更多的工作来将这些模式推广到更广阔的地理区域和更广泛的品种。这表明对土壤生物成分的局部适应性很小。另外,对真菌根定植的测量表明真菌与观察到的模式无关。根据这些结果,我们认为柳枝cultivation的种植可以从土壤生物区系的影响中受益。随着时间的推移,需要更多的工作来将这些模式推广到更广阔的地理区域和更广泛的品种。这表明对土壤生物成分的局部适应性很小。另外,对真菌根定植的测量表明真菌与观察到的模式无关。根据这些结果,我们认为柳枝cultivation的种植可以从土壤生物区系的影响中受益。随着时间的推移,需要更多的工作来将这些模式推广到更广阔的地理区域和更广泛的品种。
更新日期:2020-11-27
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