Effect of Rhodococcus opacus PD630 on selenium phytoremediation by Brassica oleracea.

IF 3.1 4区环境科学与生态学 Q2 ENVIRONMENTAL SCIENCES International Journal of Phytoremediation Pub Date : 2024-06-01 Epub Date: 2024-02-13 DOI:10.1080/15226514.2024.2311725

Sinead Morris, Diana Quispe-Arpasi, Piet N L Lens

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Abstract

The purpose of this study was to evaluate the potential of microbial-enhanced Brassica oleracea for the phytoremediation of seleniferous soils. The effect of selenite (Se(IV)) and selenate (Se(VI)) on B. oleracea (1-100 mg.L^-1) was examined through germination (7 d) and pot (30 d) trials. Microbial analysis was conducted to verify the toxic effect of various Se concentrations (1-500 mg.L^-1) on Rhodococcus opacus PD360, and to determine if it exhibits plant growth promoter traits. R. opacus PD630 was found to tolerate high concentrations of both Se(IV) and Se(VI), above 100 mg.L^-1. R. opacus PD630 reduced Se(IV) and Se(VI) over 7 days, with a Se conversion efficiency between 60 and 80%. Germination results indicated lower concentrations (0-10 mg.L^-1) of Se(IV) and Se(VI) gave a higher shoot length (> 4 cm). B. oleracea accumulated 600-1,000 mg.kg^-1dry weight (DW) of Se(IV) and Se(VI), making it a secondary accumulator of Se. Moreover, seeds inoculated with R. opacus PD360 showed increased Se uptake (up to 1,200 mg Se.kg^-1 DW). In addition, bioconcentration and translocation factors were greater than one. The results indicate a synergistic effect between R. opacus PD630 and B. oleracea for Se phytoextraction from polluted soils.

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Rhodococcus opacus PD630 对 Brassica oleracea 植物修复硒的影响。

本研究的目的是评估微生物强化芸苔属植物修复含硒土壤的潜力。通过发芽（7 d）和盆栽（30 d）试验，考察了亚硒（Se(IV)）和硒酸盐（Se(VI)）对甘蓝（1-100 mg.L-1）的影响。还进行了微生物分析，以验证不同浓度的硒（1-500 mg.L-1）对乳白球菌 PD360 的毒性作用，并确定其是否具有促进植物生长的特性。研究发现，Rhodococcus opacus PD630 可耐受高于 100 mg.L-1 的高浓度 Se（IV）和 Se（VI）。R. opacus PD630 能在 7 天内减少 Se（IV）和 Se（VI），Se 转化效率在 60% 到 80% 之间。发芽结果表明，较低浓度（0-10 mg.L-1）的 Se（IV）和 Se（VI）能产生较长的芽长（大于 4 厘米）。B. Oleracea 积累了 600-1,000 mg.kg-1 干重（DW）的 Se（IV）和 Se（VI），使其成为 Se 的二次积累者。此外，接种了 R. opacus PD360 的种子对硒的吸收量也有所增加（达 1,200 毫克 Se.kg-1 干重）。此外，生物富集因子和转移因子均大于 1。结果表明，R. opacus PD630 和 B. oleracea 对污染土壤中的硒具有植物萃取的协同效应。

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来源期刊

International Journal of Phytoremediation 环境科学-环境科学

CiteScore

7.60

自引率

5.40%

发文量

145

审稿时长

3.4 months

期刊介绍： The International Journal of Phytoremediation (IJP) is the first journal devoted to the publication of laboratory and field research describing the use of plant systems to solve environmental problems by enabling the remediation of soil, water, and air quality and by restoring ecosystem services in managed landscapes. Traditional phytoremediation has largely focused on soil and groundwater clean-up of hazardous contaminants. Phytotechnology expands this umbrella to include many of the natural resource management challenges we face in cities, on farms, and other landscapes more integrated with daily public activities. Wetlands that treat wastewater, rain gardens that treat stormwater, poplar tree plantings that contain pollutants, urban tree canopies that treat air pollution, and specialized plants that treat decommissioned mine sites are just a few examples of phytotechnologies.