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首页> 外文期刊>Environmental Science and Pollution Research >Exogenous IAA treatment enhances phytoremediation of soil contaminated with phenanthrene by promoting soil enzyme activity and increasing microbial biomass
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Exogenous IAA treatment enhances phytoremediation of soil contaminated with phenanthrene by promoting soil enzyme activity and increasing microbial biomass

机译：外源IAA处理通过促进土壤酶活性和增加微生物量来增强被菲污染的土壤的植物修复

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摘要

In this study, we aimed to confirm that indole-3-acetic acid promotes plant uptake of phenanthrene (PHE), stimulates the activity of soil enzymes or microflora, and thereby accelerates the dissipation of PHE in soil. Four treatments were evaluated: PHE-contaminated soil planted with (1) ryegrass (T0), (2) ryegrass and supplemented with 1 mg kg(-1) indole-3-acetic acid (IAA) (T1), (3) ryegrass and supplemented with 5 mg kg(-1) IAA (T5), and (4) ryegrass and supplemented with 10 mg kg(-1) IAA (T10). After 30 days, PHE concentrations were lower for all treatments and the removal rate was 70.19, 89.17, 91.26, and 97.07 % for T0, T1, T5, and T10, respectively. PHE was only detected in the roots and not in the shoots. IAA facilitated the accumulation of PHE in the roots, and plants subjected to the T10 treatment had the highest levels. Exogenous IAA stimulated soil peroxidase activity in a dose-dependent manner, whereas soil polyphenoloxidase activity was not significantly increased, except in T10. Soil microbial biomass also increased in response to IAA treatment, particularly in T10. Furthermore, phospholipid fatty acid analysis showed that IAA treatment increased microbial biomass and alleviated environmental stress. Gram-positive bacteria are largely responsible for polycyclic aromatic hydrocarbon degradation, and we found that the ratio of gram-positive to gram-negative bacteria in the soil significantly increased as the IAA concentrations increased (P < 0.05). Correlation analysis indicated that the increase in soil microbial biomass, enzyme activity, and plant uptake of PHE promotes removal of PHE from the soil.
机译：在这项研究中，我们旨在确认吲哚-3-乙酸可促进植物吸收菲（PHE），刺激土壤酶或微生物区系的活性，从而加速PHE在土壤中的耗散。评价了四种处理方法：种植了（1）黑麦草（T0），（2）黑麦草并补充1 mg kg（-1）吲哚-3-乙酸（IAA）（T1），（3）黑麦草的PHE污染土壤并补充有5 mg kg（-1）IAA（T5）和（4）黑麦草，并补充有10 mg kg（-1）IAA（T10）。 30天后，所有处理的PHE浓度均降低，并且T0，T1，T5和T10的去除率分别为70.19％，89.17％，91.26％和97.07％。仅在根部而不是在枝条中检测到PHE。 IAA促进了PHE在根中的积累，并且经过T10处理的植物的PHE含量最高。外源IAA以剂量依赖的方式刺激土壤过氧化物酶活性，而土壤多酚氧化酶活性没有显着增加，除了在T10中。土壤微生物生物量也响应IAA处理而增加，特别是在T10中。此外，磷脂脂肪酸分析表明，IAA处理增加了微生物的生物量并减轻了环境压力。革兰氏阳性菌是造成多环芳烃降解的主要原因，我们发现土壤中革兰氏阳性菌与革兰氏阴性菌的比例随着IAA浓度的增加而显着增加（P <0.05）。相关分析表明，土壤微生物量，酶活性和植物对PHE的吸收的增加促进了PHE从土壤中的去除。

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