It was noticed that after placing the seeds on wet filter paper the
plasma treated seeds got wet faster than the control samples. This ob-
servation led us to investigate further the wetting properties of the
seeds. Wetting of the seed surface is characterized by the contact
angle between the tangent to the liquid–air interface and the apparent
solid surface as macroscopically observed (Bormashenko et al., 2012).
Fig. 6 shows the water droplets deposited on the untreated and
15 min plasma treated wheat seeds.