School of Energy and Environmental Engineering, University of Science and Technology Beijing, Beijing 100083, China; Beijing Key Laboratory on Resource-Oriented Treatment of Industrial Pollutants, Beijing 100083, China.
School of Energy and Environmental Engineering, University of Science and Technology Beijing, Beijing 100083, China; Beijing Key Laboratory on Resource-Oriented Treatment of Industrial Pollutants, Beijing 100083, China.
J Hazard Mater. 2022 Jul 15;434:128829. doi: 10.1016/j.jhazmat.2022.128829. Epub 2022 Apr 1.
This study investigated the phytoremediation efficiency of Cd-contaminated soils by hyperaccumulator P. acinosa and its endophyte B. cereus, and evaluated the variation of rhizosphere/endosphere microecology characteristics. The result showed that endophyte PE31, which could successfully colonize on P. acinosa root, increased plant Cd uptake by 42.90% and 28.85% in low and high Cd contaminated soils by promotion of plant biomass and Cd concentration in plant tissues. The improved phytoremediation may attribute to the endophyte inoculation, which significantly improved the bioavailable heavy metal (HM) percentage, nutrient cycling related enzyme activities and nutrient contents including available potassium, phosphorus and organic matter. Additionally, the relative abundance beneficial bacteria Bacillus (significantly increased by 81.23% and 34.03% in the endosphere, and by 4.86% and 8.54% in rhizosphere in low and high Cd contaminated soils) and Lysobacter, showed positive and close correlation with plant growth and HM accumulation. These results indicated that endophyte inoculation could reshape rhizosphere and endosphere microecology characteristics, which enhanced the potential for phytoremediation of Cd contaminated soils.
本研究调查了超富集植物东南景天及其内生菌蜡状芽孢杆菌对 Cd 污染土壤的植物修复效率，并评估了根际/内生微生态特征的变化。结果表明，内生菌 PE31 可成功定殖于东南景天根内，通过促进植物生物量和组织中 Cd 浓度，分别将低、高 Cd 污染土壤中植物 Cd 吸收量提高了 42.90%和 28.85%。这种改良的植物修复可能归因于内生菌的接种，它显著提高了生物可利用重金属（HM）的比例、与养分循环相关的酶活性以及养分含量，包括有效钾、磷和有机质。此外，有益细菌芽孢杆菌（内生菌中分别显著增加了 81.23%和 34.03%，根际中分别增加了 4.86%和 8.54%）和赖氨酸杆菌与植物生长和 HM 积累呈正相关且紧密相关。这些结果表明，内生菌接种可以重塑根际和内生微生态特征，从而增强 Cd 污染土壤的植物修复潜力。
