Physical characterisation of chia mucilage polymeric gel and its implications on rhizosphere science - Integrating imaging, MRI, and modelling to gain insights into plant and microbial amended soils
Physical characterisation of chia mucilage polymeric gel and its implications on rhizosphere science - Integrating imaging, MRI, and modelling to gain insights into plant and microbial amended soils
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奇亚籽粘液聚合物凝胶的物理特征及其对根际科学的影响 - 整合成像、MRI 和建模以深入了解植物和微生物改良土壤
DOI：
10.1016/j.soilbio.2021.108404
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发表时间：
2021
影响因子：
9.7
通讯作者：
Williams K
中科院分区：
文献类型：
--
作者：
Williams K
根部分泌的粘液和微生物产生的细胞外聚合物（EPS）改变土壤的物理和生物地球化学过程。大多数研究从土壤体积行为中推断这些聚合物质的影响，而不是调查孔隙规模。这项研究在简化的孔隙尺度设置中量化了粘液的孤立物理行为。我们将不同浓度的粘液滴放置在两个平坦表面之间以形成液桥，并使用光学成像和磁共振成像（MRI）监测其干燥情况。我们利用观察结果验证了基于聚合物的多相模型，该模型表征了凝胶-水-空气相互作用。在实验中，当纯水液桥破裂时，粘液在干燥下弯曲，但保持表面之间的连接。核磁共振显示，两个板块中间的中心区域流失了更多的水。在模型中，粘液凝胶在发生表面粘附的边界附近聚集。模拟的累积时间与不同浓度下监测到的桥屈曲重叠，表明该模型可以预测观察到的混合物不再表现得像纯液体的转变。结果表明，在较高粘液浓度下观察到的较早相变表明，植物根系具有更强的耐旱性并增加了土壤持水能力的潜在机制。此外，我们讨论了我们的模型在描述微生物生物膜可能对土壤结构的影响以及土壤动物对土壤物理功能的影响方面的潜在应用。
Root-secreted mucilage and microbially produced extracellular polymeric substances (EPS) modify soil physical and biogeochemical processes. Most studies infer the effects of these polymeric substances from soil bulk behaviour rather than investigating the pore scale. This investigation quantified the isolated physical behaviour of mucilage in a simplified pore-scale setup. We placed drops of mucilage of different concentrations between two flat surfaces to form liquid bridges and monitored their drying using optical imaging and magnetic resonance imaging (MRI). We used our observations to validate a polymer-based multi-phase model that characterises the gel-water-air interactions. In the experiments, while pure water liquid bridges rupture, the mucilage buckled under drying, but maintained connection between the surfaces. MRI showed more water was lost from the central region in the middle of the two plates. In the model, mucilage gel accumulated near the boundaries where surface adhesion occurs. The modelled accumulation times overlapped with monitored bridge buckling for the different concentrations, showing the model can predict the observed transition at which the mixture no longer behaves like a pure liquid. Results suggest that the earlier phase transitions observed for higher mucilage concentrations show a potential mechanism for the greater drought tolerance for plant roots and increase the soil water holding capacity. Furthermore, we discuss potential applications of our model for describing the impacts that microbial biofilms may have on soil structure along with impacts of soil fauna on soil physical functions.
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DOI：
10.1103/physreve.91.042706
发表时间：
2015
期刊：
Physical review. E, Statistical, nonlinear, and soft matter physics
影响因子：
--
作者：
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通讯作者：
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影响因子：
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作者：
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作者：
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DOI：
10.1111/nph.16242
发表时间：
2019
期刊：
The New phytologist
影响因子：
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通讯作者：
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影响因子：
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作者：
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