Zinc, Iron, and Chlorophyll Metabolism in Zinc-toxic Corn

Rosen, Judith A.; Pike, Carl S.; Golden, Marc L.

doi:10.1104/pp.59.6.1085

Cited by 53 publications

(15 citation statements)

References 14 publications

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“…The negative effects of the NPs on plants could be related to the release of ions from them and/ or their direct interactions with plants (Perreault et al, 2014;Rao and Shekhawat, 2014). However, the obtained results were in agreement with the fact that the excess Zn 2+ can cause delayed growth by the decrease or inhibition of photosynthesis and imperfections of many enzyme activities, leading to metabolic disorders (Rosen et al, 1977;Hossain et al, 2012).…”

Section: Effects On the Growth Of The Plantsupporting

confidence: 75%

Comparative phytotoxicity of undoped and Er-doped ZnO nanoparticles onLemna minor L.: changes in plant physiological responses

Torbati¹,

Khataee²,

Saadi³

2017

Turk J Biol

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The present study is the first research on the phytotoxicological effects of Er-doped zinc oxide nanoparticles (NPs) on duckweed (Lemna minor L.), as a model aquatic floating macrophyte. It concentrated on the comparison of the physiological effects of different concentrations of undoped and Er-doped zinc oxide NPs on L. minor. Pure and Er-doped zinc oxide samples were synthesized through a sonochemical method and their morphology and chemical composition were studied by scanning electron microscopy and energy dispersive X-ray analysis. Plant growth, photosynthetic pigment contents, and antioxidant enzyme activities were investigated as indices to assess the effects and toxicity of the NPs on L. minor. Moreover, the dissolution of Zn 2+ from the suspensions of NPs was investigated to clearly determine whether the Zn 2+ released from the NPs was the main source of their toxicity to the plant. The results showed significant changes in the physiological parameters of the plant in response to the treatments. The negative effects of treatments on the growth of L. minor, in order, were Zn 2+ >> ZnO-NPs >> EZO-NPs >> bulk-ZnO. The activity of superoxide dismutase was remarkably increased by increasing the concentration of the contaminants in the plant.

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Section: Effects On the Growth Of The Plantsupporting

confidence: 75%

Comparative phytotoxicity of undoped and Er-doped ZnO nanoparticles onLemna minor L.: changes in plant physiological responses

Torbati¹,

Khataee²,

Saadi³

2017

Turk J Biol

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“…It has been known for many years that excess Zn 2+ can lead to the retarding of growth (Rosen et al 1977). Heavy metals may induce the release of proteins, lipids, and element components of the thylakoid membranes, leading to malfunction of light-harvesting complexes and photosystem II.…”

Section: Discussionmentioning

confidence: 99%

Comparative Effects of ZnO Nanoparticles, ZnO Bulk Particles, and Zn2+ on Brassica napus After Long-Term Exposure: Changes in Growth, Biochemical Compounds, Antioxidant Enzyme Activities, and Zn Bioaccumulation

Kouhi

Lahouti

Ganjeali

et al. 2015

Water Air Soil Pollut

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A wide variety of application of nanoparticles (NPs) in recent years has raised their possible entrance into the environment so that can affect living components of ecosystems. There is no comparative study on the long-term effects of a wide range of concentrations of NPs, related bulk particles (BPs), and corresponding metal ions on different traits of the plants. The present study has investigated comparative effects of zinc oxide (ZnO) NPs, ZnO BPs, and zinc ions (Zn 2+ ) on rapeseed (Brassica napus L.) after long-term exposure to a wide range of concentrations. The inhibitory effects of treatments on the growth of B. napus were in the order Zn 2+ >> ZnO BPs > ZnO NPs. Results showed the significant changes in the antioxidant enzyme activities, total chlorophyll, soluble proteins, proline, and soluble sugars of the leaves in response to the treatments. However, total phenolic compounds were not affected significantly by any treatment. Overall, in the present study, the toxicity of ZnO NPs on B. napus was lower than those of Zn 2+ or ZnO BPs. Results indicate that adverse effects of ZnO NPs or BPs on B. napus may be due in part to the toxic effects of Zn 2+ ions dissolution, probably induced by root exudates, or due o the physical interaction of ZnO particles with roots and induction of structural and functional disorders.

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“…Zn toxicity in Zea mays also causes chlorosis of the leaves which can be alleviated by increased supply of Fe; in this case, however, the Zn-induced chlorosis is not correlated with a decreased transport of Fe to the leaves (ROSEN et al 1977). It is suggested that in Zea mays the chlorosis may arise from FeJZn competition for an iron-requiring step in the biosynthesis of chlorophyll, as for example the enzymes t5-amino laevulinate synthetase and coproporphyrinogen reductase (Hsu and MILLER 1965;MACHOLD and STEPHAN 1969;DUGGAN and GASSMAN 1974).…”

Section: Zinc Toxicitymentioning

confidence: 91%