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Cold radiofrequency plasma treatment modifies wettability and germination speed of plant seeds.

Bormashenko E, Grynyov R, Bormashenko Y, Drori E - Sci Rep (2012)

Bottom Line: We report the possibility to modify the wetting properties of the surfaces of a diversity of seeds including: lentils (Lens culinaris), beans (Phaseolus vulgaris) and wheat (Triticum, species C9) by cold radiofrequency air plasma treatment.Air plasma treatment leads to the dramatic decrease in the apparent contact angle.Significant growth of the peaks corresponding to the nitrogen containing groups in the mass spectra of air plasma treated seeds was registered by TOF-SIMS spectroscopy.

View Article: PubMed Central - PubMed

Affiliation: Ariel University Center of Samaria, Physics Faculty, Ariel, Israel. edward@ariel.ac.il

ABSTRACT
We report the possibility to modify the wetting properties of the surfaces of a diversity of seeds including: lentils (Lens culinaris), beans (Phaseolus vulgaris) and wheat (Triticum, species C9) by cold radiofrequency air plasma treatment. Air plasma treatment leads to the dramatic decrease in the apparent contact angle. Moreover, the speed of germination and yield (germination rate) of seeds can be modified by preliminary plasma treatment. The change in the wetting properties of seeds is at least partially due to oxidation of their surface under plasma treatment. Significant growth of the peaks corresponding to the nitrogen containing groups in the mass spectra of air plasma treated seeds was registered by TOF-SIMS spectroscopy.

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TOF-SIMS mass spectrometry data comparing surface compositions of non-treated (grey columns) and plasma-treated (black columns) (a) beans, (b) lentils, (c) wheat seeds.
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f8: TOF-SIMS mass spectrometry data comparing surface compositions of non-treated (grey columns) and plasma-treated (black columns) (a) beans, (b) lentils, (c) wheat seeds.

Mentions: Modification of the seed germination performance through cold plasma treatment was investigated by Volin et al.34 They reported a significant delay in the germination speed of seeds treated by Fluorocarbon plasmas34. The results reported by Volin et al. are opposite to our findings34. This discrepancy can be understood if we consider that in our experiments, the air plasma was exploited. It is agreed that the wetting properties of organic surfaces are correlated with the amount of oxygen-containing functional groups at the sample surface3435. Indeed, the negative ion spectra of the seed surfaces treated with plasma that were obtained with TOF-SIMS spectroscopy, demonstrated 2.5–3 times more intense mass peaks of oxygen than in the spectra of non-treated seeds of all kinds used in our study, as shown in Figure 8a–c (note, that the ordinate axis is represented in the logarithmic scale). Cold air plasma treatment in our experiments enriched the surface of seeds with oxygen containing functional groups. This resulted in the essential improvement in the wettability of seeds, and eventually influenced their germination speed. The delay of germination performance observed by Volin et al. in Ref. 34 obtains a natural explanation, if the increase in hydrophobicity of seeds exposed to Fluorocarbon plasmas is suggested. The significant growth of peaks corresponding to the CN− groups in the spectra of air plasma treated seeds is noteworthy. Volin et al. noted that incorporation of nitrogen onto the surface of seeds (see Figure 8a–c) has a positive effect on germination34.


Cold radiofrequency plasma treatment modifies wettability and germination speed of plant seeds.

Bormashenko E, Grynyov R, Bormashenko Y, Drori E - Sci Rep (2012)

TOF-SIMS mass spectrometry data comparing surface compositions of non-treated (grey columns) and plasma-treated (black columns) (a) beans, (b) lentils, (c) wheat seeds.
© Copyright Policy - open-access
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC3473364&req=5

f8: TOF-SIMS mass spectrometry data comparing surface compositions of non-treated (grey columns) and plasma-treated (black columns) (a) beans, (b) lentils, (c) wheat seeds.
Mentions: Modification of the seed germination performance through cold plasma treatment was investigated by Volin et al.34 They reported a significant delay in the germination speed of seeds treated by Fluorocarbon plasmas34. The results reported by Volin et al. are opposite to our findings34. This discrepancy can be understood if we consider that in our experiments, the air plasma was exploited. It is agreed that the wetting properties of organic surfaces are correlated with the amount of oxygen-containing functional groups at the sample surface3435. Indeed, the negative ion spectra of the seed surfaces treated with plasma that were obtained with TOF-SIMS spectroscopy, demonstrated 2.5–3 times more intense mass peaks of oxygen than in the spectra of non-treated seeds of all kinds used in our study, as shown in Figure 8a–c (note, that the ordinate axis is represented in the logarithmic scale). Cold air plasma treatment in our experiments enriched the surface of seeds with oxygen containing functional groups. This resulted in the essential improvement in the wettability of seeds, and eventually influenced their germination speed. The delay of germination performance observed by Volin et al. in Ref. 34 obtains a natural explanation, if the increase in hydrophobicity of seeds exposed to Fluorocarbon plasmas is suggested. The significant growth of peaks corresponding to the CN− groups in the spectra of air plasma treated seeds is noteworthy. Volin et al. noted that incorporation of nitrogen onto the surface of seeds (see Figure 8a–c) has a positive effect on germination34.

Bottom Line: We report the possibility to modify the wetting properties of the surfaces of a diversity of seeds including: lentils (Lens culinaris), beans (Phaseolus vulgaris) and wheat (Triticum, species C9) by cold radiofrequency air plasma treatment.Air plasma treatment leads to the dramatic decrease in the apparent contact angle.Significant growth of the peaks corresponding to the nitrogen containing groups in the mass spectra of air plasma treated seeds was registered by TOF-SIMS spectroscopy.

View Article: PubMed Central - PubMed

Affiliation: Ariel University Center of Samaria, Physics Faculty, Ariel, Israel. edward@ariel.ac.il

ABSTRACT
We report the possibility to modify the wetting properties of the surfaces of a diversity of seeds including: lentils (Lens culinaris), beans (Phaseolus vulgaris) and wheat (Triticum, species C9) by cold radiofrequency air plasma treatment. Air plasma treatment leads to the dramatic decrease in the apparent contact angle. Moreover, the speed of germination and yield (germination rate) of seeds can be modified by preliminary plasma treatment. The change in the wetting properties of seeds is at least partially due to oxidation of their surface under plasma treatment. Significant growth of the peaks corresponding to the nitrogen containing groups in the mass spectra of air plasma treated seeds was registered by TOF-SIMS spectroscopy.

Show MeSH
Related in: MedlinePlus