Journal
BULLETIN OF ENVIRONMENTAL CONTAMINATION AND TOXICOLOGY
Volume 105, Issue 1, Pages 139-145Publisher
SPRINGER
DOI: 10.1007/s00128-020-02888-9
Keywords
Graphene oxide; Nanomaterial; Oxidative stress; Membrane potential; Ion flux
Categories
Funding
- National Key Research and Development Program of China [2017YFA0207001]
- National Natural Science Foundation of China [41877139, 41401565]
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In this study, the responses of wheat seedlings to graphene oxide (GO) were investigated at a wide concentration range of 0-1000 mg L-1, including oxidative stress, real-time membrane potential as well as proton and calcium ion fluxes. The results show that GO induced a hormesis effect on root growth (low concentration (100 mg L-1) promotion and high concentration (1000 mg L-1) inhibition. Oxidative stress was responsible for the growth inhibition at GO concentration of 1000 mg L-1, as suggested from great stimulation in the activities of antioxidant enzymes and MDA content in roots or leaves. Superoxide dismutase (SOD), catalase (CAT), peroxidase (POD) activities were highly correlated with MDA levels (r(2) = 0.963, 0.984, and 0.960, respectively). GO exposure caused significant concentration-dependent membrane depolarization in roots, and significantly inhibited H+ efflux and extracellular Ca2+ influx in root cap.
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