Lentil seeds have been packed in a dielectric barrier device and exposed for several minutes to a cold atmospheric plasma generated in helium with/without a reactive gas (nitrogen or oxygen). While no impact is evidenced on germination rates (caping nearly at 100% with/without plasma exposure), seeds’ vigor is clearly improved with a median germination time decreasing from 1850 min (31 h) to 1500 min (26 h), hence representing a time saving of at least 5 h. We show that the admixture of nitrogen to helium can further increase this time saving up to 8 h. Contrarily, we demonstrate that the addition of molecular oxygen to the helium discharge does not promote seeds’ vigor. Whatever the plasma chemistry utilized, these biological effects are accompanied with strong hydrophilization of the seed coating (with a decrease in contact angles from 118° to 25°) as well as increased water absorption (water uptakes measured 8 h after imbibition are close to 50% for plasma-treated seeds instead of 37% for seeds from the control group). A follow-up of the seeds over a 45-days aging period shows the sustainability of the plasma-triggered biological effects: whatever the plasma treatment, seeds’ vigor remains stable and much higher than for seeds unexposed to plasma. For these reasons, the seed-packed dielectric barrier device supplied with a He–N2 gas mixture can be considered as a relevant dry atmospheric priming plasma in the same way as those used in routine by seed companies.
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