Synthesis and Surface Functionalization under Cold-plasma Conditions.

Dénès, F.; Manolache, S.; Young, Richard M.

doi:10.2494/photopolymer.12.27

Cited by 19 publications

(22 citation statements)

References 22 publications

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“…Surface functionalization by air plasma could change the physical and chemical properties of the seed coat, thereby interrupting their dormancy and initiating germination 7 . The plasma environment is conducive to generation of bioactive small molecules that can interact with and deposit onto the seed envelope 42 and penetrate into the seed to a depth of up to 10 nm 43 .…”

Section: Resultsmentioning

confidence: 99%

Spectral characteristics of cotton seeds treated by a dielectric barrier discharge plasma

Wang

Zhou

Groot

et al. 2017

Sci Rep

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Cold atmospheric plasma has recently emerged as a simple, low-cost and efficient physical method for inducing significant biological responses in seeds and plants without the use of traditional, potentially environmentally-hazardous chemicals, fungicides or hormones. While the beneficial effects of plasma treatment on seed germination, disease resistance and agricultural output have been reported, the mechanisms that underpin the observed biological responses are yet to be fully described. This study employs Fourier Transform Infrared (FTIR) spectroscopy and emission spectroscopy to capture chemical interactions between plasmas and seed surfaces with the aim to provide a more comprehensive account of plasma−seed interactions. FTIR spectroscopy of the seed surface confirms plasma-induced chemical etching of the surface. The etching facilitates permeation of water into the seed, which is confirmed by water uptake measurements. FTIR of exhaust and emission spectra of discharges show oxygen-containing species known for their ability to stimulate biochemical processes and deactivate pathogenic microorganisms. In addition, water gas, CO2, CO and molecules containing −C(CH3)3− moieties observed in FTIR spectra of the exhaust gas during plasma treatment may be partly responsible for the plasma chemical etching of seed surface through oxidizing the organic components of the seed coat.

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Section: Resultsmentioning

confidence: 99%

Spectral characteristics of cotton seeds treated by a dielectric barrier discharge plasma

Wang

Zhou

Groot

et al. 2017

Sci Rep

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“…It has been demonstrated that the fluorine:carbon (F:C) ratios of specific fluorocarbon derivatives (rather than the experimental parameters) control the macromolecular‐structure forming processes; high values of this parameter shift the mechanisms towards ablation (etching) reactions, while low values of these ratios lead to fluorocarbon‐layer depositions. Numerous reaction mechanisms have been suggested for the formation of fluorocarbon‐type structures (Denes et al, 1997, 1999).…”

Section: Resultsmentioning

confidence: 99%

“…In other instances, delayed germination To increase seedling growth directly, a seed treatment has been investigated through retardation of imbibition may involve direct application of nutrients or plant to prevent inhibitional chilling damage of seed sown in a cold, wet soil (Priestly and Leopold, 1986;Taylor et chie, 1978;Glick, 1995;Bashan, 1998). To enhance nutri-places macromolecular plasma chemistry in the sphere of advanced technology (Denes et al, 1999; Denes, ent uptake, some investigators have treated seeds with beneficial microorganisms that can proliferate on the 1997). The most commonly used plasma reactors for the seed and improve nitrogen fixation (Tonkin, 1984;Kanvinde and Sastry, 1990).…”

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confidence: 99%

Modification of Seed Germination Performance through Cold Plasma Chemistry Technology

et al. 2000

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This study was conducted to determine if an alternate seed treatment approach based on plasma chemistry would offer a more viable alternative over traditional seed coating technologies. Seed germination characteristics were modified in five agricultural species by coating the surface of the seeds with macromolecules from a cold plasma process using a rotating plasma reactor. The source gas entering the plasma chamber during the reaction process determined the type of coating, and coatings were typically much less than 5.0 μm in thickness. To delay germination we utilized two different hydrophobic source gases, carbon tetrafluoride (CF4) or octadecafluorodecalin (ODFD). Seeds of radish (Raphanus sativus) and two pea cultivars (Pisum sativum cv. Little Marvel, P. sativum cv. Alaska) treated with CF4, resulted in a significant delay in germination compared with untreated controls. Similarly, plasma treatment with ODFD significantly delayed germination in soybean [Glycine max (L.) Merr.], corn (Zea mays L.), and bean (Phaseolus vulgaris L.) seeds. The degree of delay was dependent on the amount of coating applied, with an increased thickness of coating resulting in a greater delay in germination. To enhance germination we treated seeds with cyclohexane, or with a gas such as aniline or hydrazine. Seeds treated with cyclohexane resulted in a significant acceleration in germination percentage for soybean but not corn seeds, while hydrazine‐treated corn seed showed a small acceleration over control seed. However, both aniline‐treated soybean and corn seed had a significant acceleration in germination percentage. Tests of water uptake determined that the major mode of action of the plasma coatings was largely on the rate of imbibition. These results demonstrate a potentially important technique to modify seed germination characteristics in agricultural plant species.

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“…Cold plasma treatment has been a fast, economical, and green method to enhance seed performance [Denes et al, 1999;Yin et al, 2005;Dhayal et al, 2006;Sera et al, 2010;Li et al, 2014]. Previous studies demonstrated that cold plasma treatment could improve seed germination and fast growth of several plants such as Carthamus tinctorium L [Dhayal et al, 2006], wheat [Sera et al, 2010], tomato [Yin et al, 2005], soybean , poppy seed [Sera et al, 2013], and cannabis [Sera et al, 2016], and it could significantly increase crop yields [Yin et al, 2005].…”

Section: Introductionmentioning

confidence: 99%

Improvement of wheat seed vitality by dielectric barrier discharge plasma treatment

Qiao

Meng

et al. 2017

Bioelectromagnetics

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Influences of discharge voltage on wheat seed vitality were investigated in a dielectric barrier discharge (DBD) plasma system at atmospheric pressure and temperature. Six different treatments were designed, and their discharge voltages were 0.0, 9.0, 11.0, 13.0, 15.0, and 17.0 kV, respectively. Fifty seeds were exposed to the DBD plasma atmosphere with an air flow rate of 1.5 L min for 4 min in each treatment, and then the DBD plasma-treated seeds were prepared for germination in several Petri dishes. Each treatment was repeated three times. Germination indexes, growth indexes, surface topography, water uptake, permeability, and α-amylase activity were measured. DBD plasma treatment at appropriate energy levels had positive effects on wheat seed germination and seedling growth. The germination potential, germination index, and vigor index significantly increased by 31.4%, 13.9%, and 54.6% after DBD treatment at 11.0 kV, respectively, in comparison to the control. Shoot length, root length, dry weight, and fresh weight also significantly increased after the DBD plasma treatment. The seed coat was softened and cracks were observed, systematization of the protein was strengthened, and amount of free starch grain increased after the DBD plasma treatment. Water uptake, relative electroconductivity, soluble protein, and α-amylase activity of the wheat seed were also significantly improved after the DBD plasma treatment. Roles of active species and ultraviolet radiation generated in the DBD plasma process in wheat seed germination and seedling growth are proposed. Bioelectromagnetics. 39:120-131, 2018. © 2017 Wiley Periodicals, Inc.

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Synthesis and Surface Functionalization under Cold-plasma Conditions.

Cited by 19 publications

References 22 publications

Spectral characteristics of cotton seeds treated by a dielectric barrier discharge plasma

Spectral characteristics of cotton seeds treated by a dielectric barrier discharge plasma

Modification of Seed Germination Performance through Cold Plasma Chemistry Technology

Improvement of wheat seed vitality by dielectric barrier discharge plasma treatment

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