Unraveling the effects of arbuscular mycorrhizal fungus on uptake, translocation, and distribution of cadmium in Phragmites australis (Cav.) Trin. ex Steud

Xiaochen Huang, Li Wang, Shishu Zhu, Shih Hsin Ho, Jieting Wu, Prasanta K. Kalita, Fang Ma

Research output: Contribution to journalArticlepeer-review

Abstract

Phragmites australis (Cav.) Trin. ex Steud. has been reported to form a symbiosis with arbuscular mycorrhizal fungus (AMF). However, the tolerance mechanism for AMF symbiosis on cadmium (Cd) phytotoxicity still remains unclear. In this study, we investigated the effects of Rhizophagus irregularis inoculation on Cd-stressed (0, 1, and 20 mg L−1) roots, stems, and leaves of P. australis with regard to subcellular Cd distribution and chemical forms of Cd. In addition, transmission electron microscopy and Fourier transform infrared spectroscopy were used to investigate variations in subcellular structures and functional groups in plant organs. The results showed that AMF inoculation could induce selective Cd distribution at subcellular levels, depending on different Cd treatments. The investigation of the chemical forms illustrated that AMF inoculation could alleviate Cd toxicity in all organs. Increases were observed in the ratios of undissolved Cd (FHAc) and oxalate Cd (FHCl), while decreases were observed in pectates and protein-integrated Cd (FNaCl) as well as water soluble Cd (FW). Hydroxyl (-OH), amide (-NH), carboxyl (C=O), and phosphate (P=O) groups as well as C-O and C-N stretching played predominant roles for the enhancement of Cd tolerance in response to AMF inoculation. These results provide instructive evidence for the mechanisms by which AMF inoculation enhances the Cd tolerance of P. australis via Cd uptake and distribution.

Original languageEnglish (US)
Pages (from-to)43-50
Number of pages8
JournalEcotoxicology and Environmental Safety
Volume149
DOIs
StatePublished - Mar 2018

Keywords

  • Cd
  • Chemical forms
  • FTIR
  • Rhizophagus irregularis
  • Subcellular distribution
  • TEM

ASJC Scopus subject areas

  • Pollution
  • Public Health, Environmental and Occupational Health
  • Health, Toxicology and Mutagenesis

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