a Key Laboratory of Measurement and Control System for Coastal Basin Environment, Fujian Province University (Fuqing Branch of Fujian Normal University) , Fuqing , Fujian Province , Republic of China.
b College of Life Sciences, Zhejiang University , Hangzhou , Zhejiang Province , Republic of China.
Int J Phytoremediation. 2018 Jul 3;20(8):813-822. doi: 10.1080/15226514.2018.1438351.
In a controlled experiment, we assessed the effect of phosphate-solubilizing bacterium (PSB) on the soil metal (Cu) phytoremediation by Wedelia trilobata and examined the effect of the interaction of Cu contamination and PSB on the growth of W. trilobata. We also explored the effect of the interaction of Cu contamination and PSB on the soil microflora. The results showed that the removal efficiency of Cu from soil by W. trilobata increased with an increase in the concentration of PSB, and the translocation factors of Cu (i.e., leaf:root and stem:root) were both significantly upregulated by PSB. The PSB significantly promoted the growth of W. trilobata; however, the effect of the Cu-PSB interaction on the leaf net photosynthetic rate (Pn) of W. trilobata was not significant, whereas copper contamination had a significant negative influence on the soil microflora, PSB had a significant positive influence on the soil microflora. Thus, PSB improved the phytoremediation efficiency of W. trilobata in Cu-contaminated soil because of the positive influence on the soil microflora, improving soil quality, which then increased the growth of W. trilobata in Cu-contaminated soil. The vigorous growth of W. trlobata led to higher of Cu absorption and translocation from soil as the ultimate result.
在一项对照实验中，我们评估了溶磷菌（PSB）对三裂叶蟛蜞菊修复土壤金属（Cu）的影响，并检验了 Cu 污染和 PSB 相互作用对三裂叶蟛蜞菊生长的影响。此外，我们还探索了 Cu 污染和 PSB 相互作用对土壤微生物区系的影响。结果表明，三裂叶蟛蜞菊对土壤中 Cu 的去除效率随着 PSB 浓度的增加而提高，并且 Cu 的迁移系数（即叶：根和茎：根）均被 PSB 显著上调。PSB 显著促进了三裂叶蟛蜞菊的生长；然而，Cu-PSB 相互作用对三裂叶蟛蜞菊叶片净光合速率（Pn）的影响并不显著，而铜污染对土壤微生物区系有显著的负面影响，PSB 对土壤微生物区系有显著的积极影响。因此，PSB 通过对土壤微生物区系的积极影响，提高了三裂叶蟛蜞菊在 Cu 污染土壤中的植物修复效率，改善了土壤质量，从而促进了 Cu 污染土壤中三裂叶蟛蜞菊的生长。最终结果是，三裂叶蟛蜞菊的旺盛生长导致从土壤中吸收和转运更多的 Cu。
