Influences of Nano-TiO&lt;SUB&gt;2&lt;/SUB&gt; on the Chloroplast Aging of Spinach Under Light

Hong, Fashui; Yang, Fan; Liu, Chao; Gao, Qing Hai; Zhigang, Wan; Gu, Fei; Wu, Cheng Wen; Ma, Zhenni; Zhou, Juan; Yang, Ping

doi:10.1385/bter:104:3:249

Cited by 238 publications

(98 citation statements)

References 21 publications

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“…Addition of 0.25% nano-TiO 2 (rutile) stimulated oxygen evolution rate in spinach chloroplasts, improved chloroplast coupling and enhanced activities of Mg 2+ -ATPase and chloroplast coupling factor I CF 1 -ATPase on the thylakoid membranes [70] and nano-TiO 2 (rutile) protected chloroplasts from aging for long-time illumination [71]. Great increase of the electron transfer, oxygen evolution, and photophosphorylation was observed also in chloroplasts from nanoanatase-TiO 2 -treated spinach under visible light and ultraviolet light illumination [72].…”

Section: Positive Effects Of Mnps On Plantsmentioning

confidence: 99%

Metal Nanoparticles and Plants / Nanocząstki Metaliczne I Rośliny

Masarovičová¹,

Kráľová²

2013

Ecological Chemistry and Engineering S

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Metal nanoparticles (MNPs) belong mostly to the engineered type of nanoparticles and have not only unique physical and chemical properties but also different biological actions. In recent years, noble MNPs and their nano-sized agglomerates (collectively referred to as nanoparticles or particles in the subsequent sections) have been the subjects of much focused research due to their unique electronic, optical, mechanical, magnetic and chemical properties that can be significantly different from those of bulk materials. To enhance their use, it is important to understand the generation, transport, deposition, and interaction of such particles. Synthesis of MNPs is based on chemical or physical synthetic procedures and by use of biological material ("green synthesis" as an environmentally benign process) including bacteria, algae and vascular plants (mainly metallophytes). In biological methods for preparation of metal nanoparticles mainly leaf reductants occurring in leaf extracts are used. MNPs can be formed also directly in living plants by reduction of the metal ions absorbed as a soluble salt, indicating that plants are a suitable vehicle for production of MNPs. These methods used for preparation of MNPs are aimed to control their size and shape. Moreover, physicochemical properties of MNPs determine their interaction with living organisms. In general, inside the cells nanoparticles might directly provoke either alterations of membranes and other cell structures or activity of protective mechanisms. Indirect effects of MNPs depend on their physical and chemical properties and may include physical restraints, solubilization of toxic nanoparticle compounds or production of reactive oxygen species. Toxic impacts of MNPs on plants is connected with chemical toxicity based on their chemical composition (eg release of toxic metal ions) and with stress or stimuli caused by the surface, size and shape of these nanoparticles. Positive effects of MNPs were observed on the following plant features: seed germination, growth of plant seedlings, stimulation of oxygen evolution rate in chloroplasts, protection of chloroplasts from aging for long-time illumination, increase of the electron transfer and photophosphorylation, biomass accumulation, activity of Rubisco, increase of quantum yield of photosystem II, root elongation, increase of chlorophyll as well as nucleic acid level and increase in the shoot/root ratio. However, it should be stressed that MNPs impact on human and environmental health remains still unclear.

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Section: Positive Effects Of Mnps On Plantsmentioning

confidence: 99%

Metal Nanoparticles and Plants / Nanocząstki Metaliczne I Rośliny

Masarovičová¹,

Kráľová²

2013

Ecological Chemistry and Engineering S

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“…They found that the mixture of nanoparticles increases nitrate reductase in soybean, increasing its germination and growth. Hong et al 12,13 and Yang et al 14 reported that a proper concentration of nano-TiO 2 was found to improve the growth of spinach by promoting photosynthesis and nitrogen metabolism. Canas et al 15 found that nanofunctionalized carbon nanotubes enhanced root elongation in onion and cucumber.…”

Section: Introductionmentioning

confidence: 99%

Effect of nanoparticles suspension on the growth of mung (Vigna radiata) seedlings by foliar spray method

et al. 2013

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The present experimental investigation demonstrates the effect of nano-ZnO, nanoFeO and nano-ZnCuFe-oxide particles on the growth of mung (Vigna radiata) seedling. The study was carried out by spraying optimum concentrations of nanoparticles in suspension form on hydroponically grown test units and examining the effect on the shoot growth of seedlings. Based on biomass assay, it was found that the seedlings displayed good growth over control, demonstrating a positive effect of the nanoparticle treatment. The best performance was observed for nano-ZnCuFe-Oxide followed by nano-FeO and nano-ZnO. Absorption of nanoparticles by plant leaves was also detected by inductive coupled plasma/atomic emission spectroscopy.

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“…For example, TiO 2 nanoparticles have been shown to have a toxic effect in vetch, 3 no effect in wheat seedlings, 4 and a positive effect on both photosynthetic rates 5 and chloroplast viability 6 in spinach, although it is unclear how much of this variability is due to the model species tested, the properties of the specific TiO 2 nanomaterials used, and the method of exposure (root vs foliar). Additionally, particle size has been shown B to have large impacts on ENM uptake and distribution patterns in plants, with smaller particles typically being taken up in higher amounts and distributed throughout the plant.…”

mentioning

confidence: 99%

Environmental Stresses Increase Photosynthetic Disruption by Metal Oxide Nanomaterials in a Soil-Grown Plant

Conway

Beaulieu

et al. 2015

ACS Nano

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Despite an increasing number of studies over the past decade examining the interactions between plants and engineered nanomaterials (ENMs), very few have investigated the influence of environmental conditions on ENM uptake and toxicity, particularly throughout the entire plant life cycle. In this study, soil-grown herbaceous annual plants (Clarkia unguiculata) were exposed to TiO 2 , CeO 2 , or Cu(OH) 2 ENMs at different concentrations under distinct light and nutrient levels for 8 weeks. Biweekly fluorescence and gas exchange measurements were recorded, and tissue samples from mature plants were analyzed for metal content. During peak growth, exposure to TiO 2 and CeO 2 decreased photosynthetic rate and CO 2 assimilation efficiency of plants grown under high light and nutrient conditions, possibly by disrupting energy transfer from photosystem II (PSII) to the Calvin cycle. Exposure Cu(OH) 2 particles also disrupted photosynthesis but only in plants grown under the most stressful conditions (high light, limited nutrient) likely by preventing the oxidation of a primary PSII reaction center. TiO 2 and CeO 2 followed similar uptake and distribution patterns with concentrations being highest in roots followed by leaves then stems, while Cu(OH) 2 was present at highest concentrations in leaves, likely as ionic Cu. ENM accumulation was highly dependent on both light and nutrient levels and a predictive regression model was developed from these data. These results show that abiotic conditions play an important role in mediating the uptake and physiological impacts of ENMs in terrestrial plants.

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Influences of Nano-TiO<SUB>2</SUB> on the Chloroplast Aging of Spinach Under Light

Cited by 238 publications

References 21 publications

Metal Nanoparticles and Plants / Nanocząstki Metaliczne I Rośliny

Metal Nanoparticles and Plants / Nanocząstki Metaliczne I Rośliny

Effect of nanoparticles suspension on the growth of mung (Vigna radiata) seedlings by foliar spray method

Environmental Stresses Increase Photosynthetic Disruption by Metal Oxide Nanomaterials in a Soil-Grown Plant

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