<br>内生菌增加根际 P 和 Cd 生物利用度促进了 Phytolacca acinosa 的植物修复效率,Journal of Hazardous Materials

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内生菌增加根际 P 和 Cd 生物利用度促进了 Phytolacca acinosa 的植物修复效率
Journal of Hazardous Materials ( IF 12.2 ) Pub Date : 2022-02-24 , DOI: 10.1016/j.jhazmat.2022.128546
Chenjing Liu ₁ , Hai Lin ₁ , Yingbo Dong ₁ , Bing Li ₁

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有关根际生物可利用磷（P）和重金属（HM）空间分布的信息可能有助于精确的植物修复调节。在这项研究中，根茎盒系统被用于研究土壤-根系相互作用，并用于获取 Cd 污染土壤植物修复过程中生物可利用 P 和镉（Cd）空间分布的内生真菌接种变化。结果表明，在低和高 Cd 污染土壤中，内生真菌 PE31 蜡样芽孢杆菌对 Cd 的吸收分别提高了 52.70% 和 46.73%，使植物修复热点面积分别从 45.78% 和 15.29% 增加到 60.97% 和 21.80%。有效 P 和 Cd 显着减少，因为根活动耗尽了大量生物可利用的 P 和 Cd 浓度。然而，PE31 增加了根际土壤中的生物可利用度 P 和 Cd 浓度。根际生物可利用 P 增强与植物生长和 Cd 积累呈正相关。总体而言，内生真菌接种补偿了根际生物可利用 P 和 Cd 的减少，从而提高了植物生物量和 HM 吸收，从而提高了植物修复效率。本研究有助于更好地了解内生菌接种下的生物可利用度 P 和 Cd 空间分布，为植物修复的精确调控提供有效的管理策略。

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Increase of P and Cd bioavailability in the rhizosphere by endophytes promoted phytoremediation efficiency of Phytolacca acinosa

The information about the spatial distribution of bioavailable phosphorus (P) and heavy metal (HM) in the rhizosphere could aid in the precise phytoremediation regulation. In this study, a rhizobox system was adapted to study soil-root interactions and used to access the endophyte inoculation variation on bioavailable P and cadmium (Cd) spatial distribution during phytoremediation of Cd contaminated soils. Results showed that endophyte PE31 Bacillus cereus inoculation enhanced Cd uptake of P. acinosa by 52.70% and 46.73% in low and high Cd contaminated soils, increasing the phytoremediation hotspot area from 45.78% and 15.29% to 60.97% and 21.80%, respectively. Available P and Cd significantly diminished because root activities depleted large amounts of bioavailable P and Cd concentrations. However, PE31 increased bioavailable P and Cd concentration in the rhizosphere soil. The bioavailable P enhancement in the rhizosphere was positively correlated to plant growth and Cd accumulation. Overall, endophyte inoculation compensated the diminution of bioavailable P and Cd in the rhizosphere to improve plant biomass and HM absorption, and thus promote phytoremediation efficiency. This study helped to better understand bioavailable P and Cd spatial distribution under endophyte inoculation, which could provide effective management strategies for the precise regulation of phytoremediation.

更新日期：2022-02-24

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