EFFECT OF Cr(Ⅵ) STRESS ON ROOT EXUDATES AND MICROBIAL COMPOSITION OF <i>LEERSIA HEXANDRA</i> SWARTZ

CAO Bofeng; LIU Zixin; WEI Cuiyu; TANG Yufei; SHI Yucui; JIANG Pingping

doi:10.13205/j.hjgc.202402021

Volume 42 Issue 2

Feb. 2024

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Article Navigation > ENVIRONMENTAL ENGINEERING > 2024 > 42(2): 175-181

CAO Bofeng, LIU Zixin, WEI Cuiyu, TANG Yufei, SHI Yucui, JIANG Pingping. EFFECT OF Cr(Ⅵ) STRESS ON ROOT EXUDATES AND MICROBIAL COMPOSITION OF LEERSIA HEXANDRA SWARTZ[J]. ENVIRONMENTAL ENGINEERING , 2024, 42(2): 175-181. doi: 10.13205/j.hjgc.202402021

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CAO Bofeng, LIU Zixin, WEI Cuiyu, TANG Yufei, SHI Yucui, JIANG Pingping. EFFECT OF Cr(Ⅵ) STRESS ON ROOT EXUDATES AND MICROBIAL COMPOSITION OF LEERSIA HEXANDRA SWARTZ[J]. ENVIRONMENTAL ENGINEERING , 2024, 42(2): 175-181. doi: 10.13205/j.hjgc.202402021

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EFFECT OF Cr(Ⅵ) STRESS ON ROOT EXUDATES AND MICROBIAL COMPOSITION OF LEERSIA HEXANDRA SWARTZ

doi: 10.13205/j.hjgc.202402021

1. College of Earth Science, Guilin University of Technology, Guilin 541004, China;
2. College of Environment Science and Engineering, Guilin University of Technology, Guilin 541004, China

Received Date: 2022-12-23
Available Online: 2024-04-28

Abstract

Abstract

To investigate the response mechanism of root secretions of Leersia hexandra Swartz to Cr(Ⅵ) and identify the key microorganisms in Cr(Ⅵ) reduction, in this study, the types and contents of organic matters secreted by the roots of L. hexandra in an artificial wetland-microbial fuel cell(CW-MFC) system were studied at six Cr(Ⅵ) treatment levels(0, 40, 60, 80, 100, 120 mg/L). Soil microorganisms in the system were measured simultaneously at the control and optimal chromium treatment concentrations. The results showed that: 1) the effect of chromium stress on the root secretion of L. hexandra showed an increasing trend followed by a decreasing trend during the increase of chromium concentration, with the highest quantity of compounds in the root secretion at a hexavalent chromium treatment concentration of 80 mg/L; 2) the roots of L. hexandra were mainly lipids, alkanes, phenols, alkenes, and alcohols, of which alkanes were the most abundant; 3) hexavalent chromium stress significantly increased the enrichment of Geobacter in the CW-MFC system, which may be the key microorganism associated with chromium reduction and enrichment in L. hexandra.
- Leersia hexandra Swartz,
- Cr(Ⅵ) stress,
- root exudates,
- soil microorganism

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References

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