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MICROBIAL REMEDIATION OF SOILS CO-CONTAMINATED WITH 2,4-DICHLOROPHENOXYACETIC ACID AND CADMIUM

机译：2,4-二氯苯氧乙酸和镉共同污染土壤的微生物修复

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One-third of organically-polluted sites are also contaminated with metals; however, the bioremediation potential of such sites is not clear. While metals are thought to inhibit the abilities of microbial communities to degrade organic pollutants, several microbial-metal resistance mechanisms are known to exist. This study utilizes cadmium-resistant soil microorganisms to enhance the degradation of 2,4-dichlorophenoxyacetic acid (2,4-D) in the presence of cadmium. Cadmium-resistant bacteria were isolated from both a 40-year-old metal-contaminated soil and an uncontaminated soil. During growth experiments, it was found that the uncontaminated soil had a greater number of resistant isolates at low concentrations of cadmium, while the cadmium-contaminated soil exhibited higher microbial resistance with increased cadmium concentrations. ERIC PCR fingerprints discriminated among the cadmium-resistant isolates identified by BIOLOG as Bacillus, Corynebacterium, Pseudomonas, and Xanthomonas spp. These isolates were resistant to concentrations ranging from 5 to 275 ppm soluble cadmium. In conventional degradation studies, two resistant isolates, a Bacillus and an unidentified Gram positive rod, supported the degradation of 500 ppm 2,4-D by the cadmium-sensitive 2,4-D degrader Alcaligenes eutrophus JMP 134 in the presence of 20 and 40 ppm soluble cadmium, respectively.
机译：三分之一的有机污染场所也被金属污染；但是，此类位点的生物修复潜力尚不清楚。尽管人们认为金属会抑制微生物群落降解有机污染物的能力，但已知存在几种抗微生物金属的机制。这项研究利用抗镉土壤微生物在镉存在下增强2,4-二氯苯氧基乙酸（2,4-D）的降解。从40岁的金属污染土壤和未污染的土壤中分离出抗镉细菌。在生长实验中，发现在低浓度的镉下，未污染的土壤具有更多的抗性菌株，而在镉浓度升高的情况下，镉污染的土壤表现出较高的微生物抗性。 ERIC PCR指纹图谱在BIOLOG鉴定为芽孢杆菌，棒状杆菌，假单胞菌和Xanthomonas菌的耐镉分离物中进行了区分。这些分离株对浓度范围为5至275 ppm的可溶性镉具有抗性。在常规降解研究中，两个抗性分离株（芽孢杆菌和未鉴定的革兰氏阳性棒）支持对镉敏感的2,4-D降解剂真人拟南芥JMP 134在20和20的存在下降解500 ppm 2,4-D。 40 ppm可溶性镉。

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