Abscisic acid-catabolizing bacteria: A useful tool for enhancing phytoremediation.
Abscisic acid-catabolizing bacteria: A useful tool for enhancing phytoremediation.
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DOI：
10.1016/j.scitotenv.2021.151474
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发表时间：
2021-11
期刊：
影响因子：
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通讯作者：
Yu Wang;Zhiheng Li;Jiajun Wu;Huijun Liu;Xiaohan Sun;Lijuan Liu;Shaoting Du
中科院分区：
文献类型：
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作者：
Yu Wang;Zhiheng Li;Jiajun Wu;Huijun Liu;Xiaohan Sun;Lijuan Liu;Shaoting Du
细菌促进的植物提取在重金属（HM）污染土壤的植物修复方面已获得认可。然而，目前尚不清楚超积累植物中通过根际细菌分解代谢脱落酸（ABA）是否可以促进 HM 植物提取。在这项研究中，接种 ABA 分解代谢细菌青生红球菌，增加了在轻度和严重污染土壤中生长的超富集植物香根草、芥菜、黑麦草、龙葵和景天芽中的 HM（镉、锌、铅和铜）浓度。与未接种植物相比，分别为28.8%~331.3%、8.5%~393.4%、21.2%~222.5%、14.7%~115.5%和28.3%~174.2%。与无菌对照相比，这些超富集植物的新鲜生物量提高了 16.5%–94.4%。植物修复潜力指数，包括生物浓缩和易位因子，也表明细菌显着提高了土壤中的植物提取效率。此外，主成分分析（PCA）表明细菌对超富集植物中Cd和Zn浓度的影响与ABA代谢显着相关，但与Pb和Cu无关。结合对植物生物量的协同效应，细菌还改善了超富集植物中 Pb 和 Cu 的植物提取。总体而言，应用基于 ABA 分解代谢细菌的微生物辅助修复可能是提高 HM 污染土壤植物修复效率的替代策略。
Bacteria-facilitated phytoextraction has been gaining recognition for the phytoremediation of heavy metal (HM)-contaminated soils. Nevertheless, it remains unclear whether catabolizing abscisic acid (ABA) in hyperaccumulating plants via rhizobacteria could facilitate HM phytoextraction. In this study, inoculation with the ABA-catabolizing bacterium,Rhodococcus qingshengii, increased HM (Cd, Zn, Pb, and Cu) concentrations in the shoots of hyperaccumulatorsVetiveria zizanioides,Brassica juncea,Lolium perenneL.,Solanum nigrumL., andSedum alfrediiHance grown in mildly and severely contaminated soils by 28.8%–331.3%, 8.5%–393.4%, 21.2%–222.5%, 14.7%–115.5%, and 28.3%–174.2%, respectively, compared with non-inoculated plants. The fresh biomass of these hyperaccumulators was elevated by 16.5%–94.4%, compared to that of the bacteria-free control. Phytoremediation potential indices, including bioconcentration and translocation factors, also revealed that the bacteria markedly boosted the phytoextraction efficacy from soil. Furthermore, principal component analysis (PCA) suggested that the effects of bacteria on the concentrations of Cd and Zn in hyperaccumulators were significantly correlated with ABA metabolism, but not with Pb and Cu. Combined with the synergistic effects on plant biomass, the bacteria also improved the phytoextraction of Pb and Cu in hyperaccumulators. Overall, the application of microorganism-assisted remediation based on ABA-catabolizing bacteria might be an alternative strategy for enhancing phytoremediation efficiency in HM-contaminated soils.