Burapha University, Biological Science Program, Faculty of Science, Chonburi, Thailand.
Int J Phytoremediation. 2012 Jul;14(6):585-95. doi: 10.1080/15226514.2011.587478.
A study was undertaken to assess if corn (Zea mays L.) can enhance phenanthrene degradation in two soils inoculated with Pseudomonas sp. UG14Lr. Corn increased the number of UG14Lr cells in both soils, especially in the acidic soiL Phenanthrene was degraded to a greater extent in UG14Lr-inoculated or corn-planted soils than uninoculated and unplanted soils. The spiked phenanthrene was completely removed within 70 days in all the treatments in slightly alkaline soil. However, in acidic soil, complete phenanthrene removal was found only in the corn-planted treatments. The shoot and root lengths of corn grown in UG14Lr-inoculated soils were not different from those in non-inoculated soil between the treatments. The results showed that in unplanted soil, low pH adversely affected the survival and phenanthrene degradation ability of UG14Lr. Planting of corn significantly enhanced the survival of UG14Lr cells in both the bulk and rhizospheric soil, and this in turn significantly improved phenanthrene degradation in acidic soil. Re-inoculation of UG14Lr in the acidic soil increased the number of UG14Lr cells and enhanced phenanthrene degradation in unplanted soil. However, in corn-planted acidic soils, re-inoculation of UG14Lr did not further enhance the already active phenanthrene degradation occurring in both the bulk or rhizospheric soils.
一项研究评估了玉米（Zea mays L.）在接种假单胞菌 UG14Lr 的两种土壤中是否能增强菲的降解。玉米增加了两种土壤中 UG14Lr 细胞的数量，尤其是在酸性土壤中。与未接种和未种植的土壤相比，UG14Lr 接种或种植玉米的土壤中菲的降解程度更大。在略碱性土壤中，所有处理中添加的菲在 70 天内被完全去除。然而，在酸性土壤中，只有在种植玉米的处理中才发现菲被完全去除。在接种 UG14Lr 的土壤中生长的玉米的茎和根长与未接种土壤中的处理没有区别。结果表明，在未种植的土壤中，低 pH 值对 UG14Lr 的存活和菲降解能力有不利影响。种植玉米显著增强了 UG14Lr 细胞在整个土壤和根际土壤中的存活，这反过来又显著提高了酸性土壤中菲的降解。在酸性土壤中重新接种 UG14Lr 增加了 UG14Lr 细胞的数量，并增强了未种植土壤中菲的降解。然而，在种植玉米的酸性土壤中，重新接种 UG14Lr 并没有进一步增强在整个土壤或根际土壤中已经活跃的菲降解。
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