College of Water Sciences, Beijing Normal University, Beijing 100875, China.
Chemosphere. 2010 Oct;81(5):645-50. doi: 10.1016/j.chemosphere.2010.08.022. Epub 2010 Sep 15.
The research utilized Bidens maximowicziana along with pyrene-degrading bacteria to evaluate their potential in cleaning up pyrene contamination. The removal of pyrene from the planted soil was obviously higher than that from the unplanted soils. After 50 d of B. maximowicziana growth, the average removal ratio of pyrene in planted soil was 79%, which was 28% higher than that of pyrene in unplanted soil. In contrast to other plants, both roots and shoots of B. maximowicziana could accumulate a large amount of pyrene from the soil and pyrene uptake increased with the soil pyrene concentration. Through analysis of pathways of pyrene removal, this enhanced removal of pyrene by plant-microbial association might be mainly the result of B. maximowicziana-promoted microbial degradation. Both the catalase and polyphenol oxidase activities in soil were higher in planted soil than those in unplanted soil. And the bacteria populations in soil, especially in rhizosphere, were also inspired by the growth of B. maximowicziana. These could be explained by the rhizosphere effect. Therefore, bio-removal of pyrene in the contaminated soils was feasible using B. maximowicziana.
该研究利用三叶鬼针草和芘降解菌来评估它们在芘污染修复方面的潜力。种植土壤中芘的去除率明显高于未种植土壤。经过 50 天的三叶鬼针草生长，种植土壤中芘的平均去除率为 79%，比未种植土壤中芘的去除率高 28%。与其他植物相比，三叶鬼针草的根和茎叶都能从土壤中大量吸收芘，并且随着土壤中芘浓度的增加，芘的吸收量也随之增加。通过对芘去除途径的分析，植物-微生物联合作用对芘的这种增强去除可能主要是由于三叶鬼针草促进了微生物的降解。种植土壤中的过氧化氢酶和多酚氧化酶活性均高于未种植土壤。而且，土壤中的细菌种群，特别是根际中的细菌种群，也因三叶鬼针草的生长而受到刺激。这可以用根际效应来解释。因此，利用三叶鬼针草可以实现污染土壤中芘的生物修复。
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