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首页> 外文期刊>Plant and Soil >Modified micro suction cup/rhizobox approach for the in-situ detection of organic acids in rhizosphere soil solution
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Modified micro suction cup/rhizobox approach for the in-situ detection of organic acids in rhizosphere soil solution

机译：改进的微型吸盘/根瘤菌箱方法用于根际土壤溶液中有机酸的原位检测

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摘要

Root–soil interactions can strongly influence the soil solution chemistry in the rhizosphere. In the present study we propose a modification of the classical rhizobox/micro suction cup system to make it suitable for the collection and analysis of organic acids in the rhizosphere. In order to show the potential of the method, we tested the modified system with Lupinus albus L. as a model plant known to exude large amounts of citrate. The suction cups were installed through the transparent front plate of the rhizoboxes just after the emergence of cluster roots in order to allow optimal localized collection of soil solution. A small dead-volume allowed almost immediate stabilisation with formaldehyde of the sampled soil solutions in the collection container to prevent microbial degradation. The concentrations of organic acids were significantly larger in the rhizosphere soil solution of active cluster roots of Lupinus albus L. than in the bulk soil solution (about 400 µM of citrate versus <0.05 µM). We were able to follow the exudation process in-situ, which occurred during 2–3 days. Also the concentrations of other organic acids and inorganic anions differed between the bulk soil and the rhizosphere of cluster roots, normal roots, and nodules.
机译：根－土相互作用会强烈影响根际土壤溶液的化学性质。在本研究中，我们提出了对经典根瘤菌/微型吸盘系统的改进，使其适用于根际中有机酸的收集和分析。为了显示该方法的潜力，我们使用羽扇豆作为已知可散发大量柠檬酸盐的模型植物，对改良的系统进行了测试。刚好在丛生根出现后，通过根际盒子的透明前面板安装吸盘，以实现土壤溶液的最佳局部收集。很小的死体积使收集容器中的采样土壤溶液中的甲醛几乎立即稳定，以防止微生物降解。羽扇豆活动簇根的根际土壤溶液中的有机酸浓度明显高于散装土壤溶液中的有机酸浓度（柠檬酸约为400 µM，<0.05 µM）。我们能够在2到3天内进行原位渗出过程。在块状根，正常根和根瘤的块状土壤和根际之间，其他有机酸和无机阴离子的浓度也有所不同。

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