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Arbuscular mycorrhizal fungi alleviate Cd phytotoxicity by altering Cd subcellular distribution and chemical forms in Zea mays.
Ecotoxicol Environ Saf. 2019 Apr 30; 171:352-360.EE

Abstract

Arbuscular mycorrhizal fungus (AMF) can relieve Cd phytotoxicity and improve plant growth, but the mechanisms involved in this process have still been not completely known. In the present work, a pot experiment was conducted to examine productions of glutathione (GSH) and phytochelatins (PCs), and absorption, chemical forms and subcellular distribution of Cd in maize (Zea mays) inoculated with or without AMF (Rhizophagus intraradices (Ri) and Glomus versiforme (Gv)) in Cd-amended soils (0, 1 and 5 mg Cd kg-1 soil). In general, both Ri and Gv inoculation dramatically enhanced biomass production and reduced Cd concentrations in shoots and roots of maize when compared to the non-mycorrhizal treatment. Moreover, both Ri and Gv symbiosis obviously increased contents of GSH and PCs, both in shoots and roots. Subcellular distribution of Cd in maize indicated that most of Cd (more than 90%) was accumulated in cell wall and soluble fraction. In addition, Cd proportions in soluble fractions in shoots of maize inoculated with Gv or Ri were considerably increased, but reduced in cell wall fractions compared to non-mycorrhizal maize, indicating that mycorrhizal symbiosis promoted Cd transfer to vacuoles. Furthermore, proportions of Cd in inorganic and water-soluble forms were declined, but elevated in pectates and proteins-integrated forms in mycorrhizal maize, which suggested that Gv and Ri could convert Cd into inactive forms. These observations could provide a further understanding of potential Cd detoxification mechanism in maize inoculated with AMF.

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Authors+Show Affiliations

Zhang XF
Guangzhou Key Laboratory of Subtropical Biodiversity and Biomonitoring, Key Laboratory of Ecology and Environmental Science in Guangdong Higher Education, Guangdong Provincial Engineering Technology Research Center for Drug and Food Biological Resources Processing and Comprehensive Utilization, College of Life Sciences, South China Normal University, Guangzhou 510631, PR China.
Hu ZH
Guangzhou Key Laboratory of Subtropical Biodiversity and Biomonitoring, Key Laboratory of Ecology and Environmental Science in Guangdong Higher Education, Guangdong Provincial Engineering Technology Research Center for Drug and Food Biological Resources Processing and Comprehensive Utilization, College of Life Sciences, South China Normal University, Guangzhou 510631, PR China.
Yan TX
Guangzhou Key Laboratory of Subtropical Biodiversity and Biomonitoring, Key Laboratory of Ecology and Environmental Science in Guangdong Higher Education, Guangdong Provincial Engineering Technology Research Center for Drug and Food Biological Resources Processing and Comprehensive Utilization, College of Life Sciences, South China Normal University, Guangzhou 510631, PR China.
Lu RR
Guangzhou Key Laboratory of Subtropical Biodiversity and Biomonitoring, Key Laboratory of Ecology and Environmental Science in Guangdong Higher Education, Guangdong Provincial Engineering Technology Research Center for Drug and Food Biological Resources Processing and Comprehensive Utilization, College of Life Sciences, South China Normal University, Guangzhou 510631, PR China.
Peng CL
Guangzhou Key Laboratory of Subtropical Biodiversity and Biomonitoring, Key Laboratory of Ecology and Environmental Science in Guangdong Higher Education, Guangdong Provincial Engineering Technology Research Center for Drug and Food Biological Resources Processing and Comprehensive Utilization, College of Life Sciences, South China Normal University, Guangzhou 510631, PR China.
Li SS
Guangzhou Key Laboratory of Subtropical Biodiversity and Biomonitoring, Key Laboratory of Ecology and Environmental Science in Guangdong Higher Education, Guangdong Provincial Engineering Technology Research Center for Drug and Food Biological Resources Processing and Comprehensive Utilization, College of Life Sciences, South China Normal University, Guangzhou 510631, PR China.
Jing YX
Guangzhou Key Laboratory of Subtropical Biodiversity and Biomonitoring, Key Laboratory of Ecology and Environmental Science in Guangdong Higher Education, Guangdong Provincial Engineering Technology Research Center for Drug and Food Biological Resources Processing and Comprehensive Utilization, College of Life Sciences, South China Normal University, Guangzhou 510631, PR China. Electronic address: jingyx@scnu.edu.cn.

MeSH

BiomassCadmiumCell WallGlomeromycotaGlutathioneMycorrhizaePhytochelatinsPlant DevelopmentPlant RootsPlant ShootsSoilSoil PollutantsSymbiosisVacuolesZea mays

Pub Type(s)

Journal Article

Language

eng

PubMed ID

30616152

Citation

Zhang, Xiao-Feng, et al. "Arbuscular Mycorrhizal Fungi Alleviate Cd Phytotoxicity By Altering Cd Subcellular Distribution and Chemical Forms in Zea Mays." Ecotoxicology and Environmental Safety, vol. 171, 2019, pp. 352-360.
Zhang XF, Hu ZH, Yan TX, et al. Arbuscular mycorrhizal fungi alleviate Cd phytotoxicity by altering Cd subcellular distribution and chemical forms in Zea mays. Ecotoxicol Environ Saf. 2019;171:352-360.
Zhang, X. F., Hu, Z. H., Yan, T. X., Lu, R. R., Peng, C. L., Li, S. S., & Jing, Y. X. (2019). Arbuscular mycorrhizal fungi alleviate Cd phytotoxicity by altering Cd subcellular distribution and chemical forms in Zea mays. Ecotoxicology and Environmental Safety, 171, 352-360. https://doi.org/10.1016/j.ecoenv.2018.12.097
Zhang XF, et al. Arbuscular Mycorrhizal Fungi Alleviate Cd Phytotoxicity By Altering Cd Subcellular Distribution and Chemical Forms in Zea Mays. Ecotoxicol Environ Saf. 2019 Apr 30;171:352-360. PubMed PMID: 30616152.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Arbuscular mycorrhizal fungi alleviate Cd phytotoxicity by altering Cd subcellular distribution and chemical forms in Zea mays. AU - Zhang,Xiao-Feng, AU - Hu,Zun-He, AU - Yan,Ting-Xiu, AU - Lu,Rui-Rui, AU - Peng,Chang-Lian, AU - Li,Shao-Shan, AU - Jing,Yuan-Xiao, Y1 - 2019/01/04/ PY - 2018/11/21/received PY - 2018/12/27/revised PY - 2018/12/28/accepted PY - 2019/1/8/pubmed PY - 2019/3/19/medline PY - 2019/1/8/entrez KW - Arbuscular mycorrhizal fungus KW - Cd KW - Heavy metal KW - Phytochelatins KW - Zea mays SP - 352 EP - 360 JF - Ecotoxicology and environmental safety JO - Ecotoxicol Environ Saf VL - 171 N2 - Arbuscular mycorrhizal fungus (AMF) can relieve Cd phytotoxicity and improve plant growth, but the mechanisms involved in this process have still been not completely known. In the present work, a pot experiment was conducted to examine productions of glutathione (GSH) and phytochelatins (PCs), and absorption, chemical forms and subcellular distribution of Cd in maize (Zea mays) inoculated with or without AMF (Rhizophagus intraradices (Ri) and Glomus versiforme (Gv)) in Cd-amended soils (0, 1 and 5 mg Cd kg-1 soil). In general, both Ri and Gv inoculation dramatically enhanced biomass production and reduced Cd concentrations in shoots and roots of maize when compared to the non-mycorrhizal treatment. Moreover, both Ri and Gv symbiosis obviously increased contents of GSH and PCs, both in shoots and roots. Subcellular distribution of Cd in maize indicated that most of Cd (more than 90%) was accumulated in cell wall and soluble fraction. In addition, Cd proportions in soluble fractions in shoots of maize inoculated with Gv or Ri were considerably increased, but reduced in cell wall fractions compared to non-mycorrhizal maize, indicating that mycorrhizal symbiosis promoted Cd transfer to vacuoles. Furthermore, proportions of Cd in inorganic and water-soluble forms were declined, but elevated in pectates and proteins-integrated forms in mycorrhizal maize, which suggested that Gv and Ri could convert Cd into inactive forms. These observations could provide a further understanding of potential Cd detoxification mechanism in maize inoculated with AMF. SN - 1090-2414 UR - https://www.unboundmedicine.com/medline/citation/30616152/Arbuscular_mycorrhizal_fungi_alleviate_Cd_phytotoxicity_by_altering_Cd_subcellular_distribution_and_chemical_forms_in_Zea_mays_ DB - PRIME DP - Unbound Medicine ER -