Fig. 1. Schematic diagram of experimental equipment

Fig. 2. Effects of single factor on germination index of Lycium barbarum: (a) time; (b) voltage; (c) electrolytic

Fig. 3. Contour and response surface diagram of the interaction of various factors on germination rate

Fig. 4. Contour and response surface diagram of the interaction of various factors on the vigor index

Fig. 5. Seed germination parameters for verification test

Fig. 6. Contact angle measurement images before and after treatment with CGDP: (a) control; (b) treatment; CA stands for contact angle

Fig. 7. Effects of CGDP treatment on seed surface contact angle

Fig. 8. Effects of contact glow discharge plasma treatment on seed coat morphology: (a) and (b) are SEM images for the untreated Lycium barbarum seed surface at magnifications of 1 000 × and 3 000 ×, respectively; (c) and (d) are corresponding images after 15 min plasma treatment

Fig. 9. Seedlings growth after transplanting for 30 d before (a, b, c) and after (d, e, f) CGDP treatment

Fig. 10. Effects of CGDP on chlorophyll content in Lycium barbarum leaves

Fig. 11. Schematic diagram of the effects of CGDP on seed germination and growth