Yoshihiro Oka

<jats:title>Abstract</jats:title> <jats:p>Low-temperature plasma has been attracting attention as a new method to promote seed germination. Cavitation bubble plasma, a type of low-temperature plasma, is a technology that generates electrode-derived metal nanoparticles/ions and abundant reactive oxygen species in water. In this study, it was investigated that the germination rate of radish (<jats:italic>Raphanus sativus L.</jats:italic>) sprouts seeds soaked in cavitation bubble plasma treated water produced using different electrode materials. It was revealed that the characteristics (metal concentration, hydrogen peroxide concentration, Oxidation–Reduction Potential, pH, conductivity) differed depending on the electrode material. Cavitation bubble plasma treated water produced using W, Fe, and Cu electrodes had high hydrogen peroxide concentrations and promoted seed germination. On the other hand, in the case of Ag electrodes, hydrogen peroxide rapidly decreased and did not promote germination. The germination rate of seeds soaked in hydrogen peroxide increased, but the germination-promoting effect was not as great as that of cavitation bubble plasma treated water, suggesting the involvement of other reactive oxygen species.</jats:p>