Abstract:Atmospheric-pressure N2, He, air, and O2 microplasma arrays have been used to investigate the effects of plasma treatment on seed germination and seedling growth of mung bean in aqueous solution. Seed germination and growth of mung bean were found to strongly depend on the feed gases used to generate plasma and plasma treatment time. Compared to the treatment with atmospheric-pressure O2, N2 and He microplasma arrays, treatment with air microplasma arrays was shown to be more efficient in improving both the se… Show more
“…4. This is because the discharge in air includes O 2 , an electronegative gas, which leads to the formation of an excess of oxygen-containing species that can absorb electrons by direct electron attachment (O 2 + e − → O 2
− ) or dissociative attachment (O 2 + e − → O + O − ), consuming the electrons that would otherwise participate in further excitation and ionization reactions 18, 22 .Figure 3FTIR spectra of cotton seeds treated by ( a ) air and ( b ) N 2 flow discharges for different treatment times.Figure 4FTIR spectra of the exhaust gas for ( a ) air and ( b ) N 2 discharges with and without seeds. In addition to nitrogen oxides, water gas, CO 2 , CO and the −C(CH 3 ) 3 − group were observed in the FTIR spectra for both air and N 2 flow discharges in the presence of cotton seeds, which confirms plasma chemical etching of the seed surface via oxidation of organic components present on the seed coat.
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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.
“…4. This is because the discharge in air includes O 2 , an electronegative gas, which leads to the formation of an excess of oxygen-containing species that can absorb electrons by direct electron attachment (O 2 + e − → O 2
− ) or dissociative attachment (O 2 + e − → O + O − ), consuming the electrons that would otherwise participate in further excitation and ionization reactions 18, 22 .Figure 3FTIR spectra of cotton seeds treated by ( a ) air and ( b ) N 2 flow discharges for different treatment times.Figure 4FTIR spectra of the exhaust gas for ( a ) air and ( b ) N 2 discharges with and without seeds. In addition to nitrogen oxides, water gas, CO 2 , CO and the −C(CH 3 ) 3 − group were observed in the FTIR spectra for both air and N 2 flow discharges in the presence of cotton seeds, which confirms plasma chemical etching of the seed surface via oxidation of organic components present on the seed coat.
…”
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.
“…Alves Júnior et al (2016a) and Zhou et al (2016) assessed the effects of atmospheric plasma treatment on seeds of Spondias tuberosa and Phaseolus vulgaris and observed changes in the physical and physiological responses of the seeds after treatment by DBD plasma. These results are in line with those obtained in the present study.…”
-Plasma technology is a fast, cost-effective, and pollution-free method that can be used in place of conventional methods to overcome seed dormancy. The goal of the present study was to determine the effect of different application times of atmospheric plasma on soaking and germination of Hybanthus calceolaria seeds in order to accelerate these processes. Helium plasma jet produced by dielectric barrier discharge was used to treat H. calceolaria seeds with applications of 1, 5, and 10 minutes. The treated seeds were characterized considering their weight variation during soaking, changes in electrical conductivity, and pH. It was found that germination depended on the plasma application time. The treatment of H. calceolaria seeds with atmospheric plasma for 1 minute provided 3.5 times greater germination in comparison to untreated seeds. Atmospheric plasma technology obtained by dielectric barrier discharge had potential of being used as a germination accelerant in H. calceolaria seeds. The treatment of H. calceolaria seeds using atmospheric plasma for 1 minute favored germination.
“…The indirect plasma treatment/activation of seeds and plants by the CP, that is, the effect of plasma activated gas or plasma activated water (PAW) is far less studied than the direct plasma effect even though it can also enhance seed germination and plant growth. The PAW can be generated by operating electric discharges directly in water but more often in gas in a contact with water, usually above the water surface, for example, gliding arc, glow discharge, dielectric barrier discharge, or plasma jets . Besides pure water also other liquid media, such as drainage water from pots, nutrient solution, or fertilizer have been activated and used.…”
The paper presents the study on the effects of the plasma activated water (PAW) generated by transient spark discharge on the wheat (Triticum aestivum L.) cultivated in vitro and in vivo. Water uptake and germination of seeds, growth parameters of seedlings and plants, as well as the content of photosynthetic pigments, soluble proteins and activity of antioxidant enzymes are reported and correlated with the concentrations of reactive oxygen and nitrogen species in the PAW. The PAW improves germination, early development of the seedlings, the content of photosynthetic pigments in the leaves and soluble protein content in the roots, and suppresses the activity of antioxidant enzymes. The results indicate that the PAW may effectively stimulate growth of the wheat seedlings and positively affect their metabolism especially in the soil with low nutrient content.
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