Efficiency of plasma‐processed air for biological decontamination of crop seeds on the premise of unimpaired seed germination
Nicola Wannicke, Robert Wagner, Joerg Stachowiak, Thalita Mayumi Castaldelli Nishime, Joerg Ehlbeck, Klaus‐Dieter Weltmann, Henrike Brust
Abstract
Abstract In this study, the antimicrobial effect of plasma‐processed air (PPA) generated by a microwave‐induced nonthermal plasma was investigated for preharvest utilization using three crop species: Barley, rape, and lupine. Bacillus atrophaeus spores were chosen as a model, inoculated onto seeds, and subsequently treated with PPA at two different flow rates, different filling regimes, and gas exposure times. PPA treatment was efficient in reducing viable spores of B. atrophaeus , reaching sporicidal effects in all species at certain parameter combinations. Maximum germination of seeds was strongly reduced in barley and rape seeds at some parameter combination, whereas it had a modest effect on lupine seeds. Seed hydrophilicity was not altered. Overall, PPA investigated in this study proved suitable for preharvest applications.