Spatial dynamics of pH in the rhizosphere of Leersia hexandra Swartz at different chromium exposure
The roots of hyperaccumulators can significantly alter soil pH and thus change the chromium (Cr) availability in the rhizosphere. The pH dynamics in the rhizosphere of Cr hyperaccumulator Leersia hexandra Swartz remains unknown. In this study, the spatial dynamics of pH in the rhizosphere of L. hexa...
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| Format: | Article |
| Language: | English |
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Elsevier
2023-09-01
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| Series: | Ecotoxicology and Environmental Safety |
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| Online Access: | http://www.sciencedirect.com/science/article/pii/S0147651323008849 |
| _version_ | 1797683217261658112 |
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| author | Na Ding Habib Ullah Guo Yu Yao He Liheng Liu Yiruiwen Xie Asfandyar Shahab Hua Lin |
| author_facet | Na Ding Habib Ullah Guo Yu Yao He Liheng Liu Yiruiwen Xie Asfandyar Shahab Hua Lin |
| author_sort | Na Ding |
| collection | DOAJ |
| description | The roots of hyperaccumulators can significantly alter soil pH and thus change the chromium (Cr) availability in the rhizosphere. The pH dynamics in the rhizosphere of Cr hyperaccumulator Leersia hexandra Swartz remains unknown. In this study, the spatial dynamics of pH in the rhizosphere of L. hexandra at different Cr exposure were examined using planar optode (PO). The effects of different Cr concentrations on the biomass, physiological parameters, and soil enzyme activity were investigated. The results showed that pH in the rhizosphere of L. hexandra was highly heterogeneous and followed the root shape. There were obvious soil acidification in all groups and the average pH values in the control, Cr50, and Cr100 groups decreased by 0.26, 0.27, and 0.35 pH unit, respectively. At a certain concentration (50 mg kg–1), Cr significantly increased the plant height and biomass of L. hexandra compared to the control (p < 0.05). The concentrations of chlorophyll a, chlorophyll b, and total chlorophyll in the leaves increased with increasing Cr concentrations. The acid phosphatase, urease, and catalase activities in the rhizosphere were higher than those in the bulk soil. These results provide new insights into elucidating the hyperaccumulating mechanism of Cr and improving the phytoremediation efficiency. |
| first_indexed | 2024-03-12T00:11:22Z |
| format | Article |
| id | doaj.art-b6c9ab2588f94ae5ac36f8d9edbbe29a |
| institution | Directory Open Access Journal |
| issn | 0147-6513 |
| language | English |
| last_indexed | 2024-03-12T00:11:22Z |
| publishDate | 2023-09-01 |
| publisher | Elsevier |
| record_format | Article |
| series | Ecotoxicology and Environmental Safety |
| spelling | doaj.art-b6c9ab2588f94ae5ac36f8d9edbbe29a2023-09-16T05:28:36ZengElsevierEcotoxicology and Environmental Safety0147-65132023-09-01263115380Spatial dynamics of pH in the rhizosphere of Leersia hexandra Swartz at different chromium exposureNa Ding0Habib Ullah1Guo Yu2Yao He3Liheng Liu4Yiruiwen Xie5Asfandyar Shahab6Hua Lin7College of Environmental Science and Engineering, Guilin University of Technology, Guilin, ChinaInnovation Center of Yangtze River Delta, Zhejiang University, Zhejiang 311400, ChinaCollege of Environmental Science and Engineering, Guilin University of Technology, Guilin, China; Corresponding authors.College of Environmental Science and Engineering, Guilin University of Technology, Guilin, ChinaCollege of Environmental Science and Engineering, Guilin University of Technology, Guilin, ChinaDepartment of Architecture and Environmental Engineering, Taiyuan University, Taiyuan, ChinaCollege of Environmental Science and Engineering, Guilin University of Technology, Guilin, ChinaCollege of Environmental Science and Engineering, Guilin University of Technology, Guilin, China; Corresponding authors.The roots of hyperaccumulators can significantly alter soil pH and thus change the chromium (Cr) availability in the rhizosphere. The pH dynamics in the rhizosphere of Cr hyperaccumulator Leersia hexandra Swartz remains unknown. In this study, the spatial dynamics of pH in the rhizosphere of L. hexandra at different Cr exposure were examined using planar optode (PO). The effects of different Cr concentrations on the biomass, physiological parameters, and soil enzyme activity were investigated. The results showed that pH in the rhizosphere of L. hexandra was highly heterogeneous and followed the root shape. There were obvious soil acidification in all groups and the average pH values in the control, Cr50, and Cr100 groups decreased by 0.26, 0.27, and 0.35 pH unit, respectively. At a certain concentration (50 mg kg–1), Cr significantly increased the plant height and biomass of L. hexandra compared to the control (p < 0.05). The concentrations of chlorophyll a, chlorophyll b, and total chlorophyll in the leaves increased with increasing Cr concentrations. The acid phosphatase, urease, and catalase activities in the rhizosphere were higher than those in the bulk soil. These results provide new insights into elucidating the hyperaccumulating mechanism of Cr and improving the phytoremediation efficiency.http://www.sciencedirect.com/science/article/pii/S0147651323008849Leersia hexandra SwartzPlanar optodeRhizospherePH mappingAcidification |
| spellingShingle | Na Ding Habib Ullah Guo Yu Yao He Liheng Liu Yiruiwen Xie Asfandyar Shahab Hua Lin Spatial dynamics of pH in the rhizosphere of Leersia hexandra Swartz at different chromium exposure Ecotoxicology and Environmental Safety Leersia hexandra Swartz Planar optode Rhizosphere PH mapping Acidification |
| title | Spatial dynamics of pH in the rhizosphere of Leersia hexandra Swartz at different chromium exposure |
| title_full | Spatial dynamics of pH in the rhizosphere of Leersia hexandra Swartz at different chromium exposure |
| title_fullStr | Spatial dynamics of pH in the rhizosphere of Leersia hexandra Swartz at different chromium exposure |
| title_full_unstemmed | Spatial dynamics of pH in the rhizosphere of Leersia hexandra Swartz at different chromium exposure |
| title_short | Spatial dynamics of pH in the rhizosphere of Leersia hexandra Swartz at different chromium exposure |
| title_sort | spatial dynamics of ph in the rhizosphere of leersia hexandra swartz at different chromium exposure |
| topic | Leersia hexandra Swartz Planar optode Rhizosphere PH mapping Acidification |
| url | http://www.sciencedirect.com/science/article/pii/S0147651323008849 |
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