Phenanthrene (PHE) is harmful to human health and is difficult to be eliminated from environment. In this study, two aerobic bacteria capable of utilizing PHE as a sole source of carbon and energy were isolated and classified as Burkholderia sp. PHED1 and Achromobacter sp. PHED2 according to 16S rDNA analysis. The combined use of maize plants and strain PHED1 or PHED2 enhanced the removal efficiency of PHE (200 mg/kg) from the soil. Moreover, PHED2 inoculation showed more enhancement of root dry weight in comparison with PHED1. PHED2 inoculation also showed more increases of chlorophyll content, net photosynthesis rate and transpiration rate in maize plants in comparison with PHED1. In the PHE degradation pathway by strain PHED2, it was proposed that the salicylic acid (SA) was formed from the 1-hydroxy-2-naphthoic acid, through the intermediate of 1, 2-dihydroxynaphthalene. The SA as the PHE degradation product by PHED2 could enhance the growth of maize plant, increase the reduced form of glutathione content and glutathione reductase activity, which participated in the promotion of PHE degradation and stress tolerance in maize plants.

菲（PHE）对人体健康有害，很难从环境中消除。在这项研究中，分离出两种能够利用PHE作为唯一碳和能量来源的好氧细菌，并将其归类为Burkholderia sp。PHED1和无色杆菌sp。PHED2根据16S rDNA分析。玉米植物与PHED1或PHED2菌株的组合使用提高了土壤中PHE（200 mg / kg）的去除效率。此外，与PHED1相比，接种PHED2显示出更多的根干重增加。与PHED1相比，接种PHED2还显示玉米植物的叶绿素含量，净光合速率和蒸腾速率增加更多。有人提出在PHED2菌株引起的PHE降解途径中，水杨酸（SA）是由1-羟基-2-萘甲酸通过1，2-二羟基萘的中间体形成的。PHED2作为PHE降解产物的SA可以促进玉米植物的生长，增加谷胱甘肽含量和谷胱甘肽还原酶活性的还原形式，