Fig. 1.

Regrowth rates of shoot tips of Cannabis sativa cultivars MX (a), VI-20 (b), and B-5 (c) exposed to plant vitrification solution #2 (PVS2) for 10–30 min at 25 ± 2°C prior to cryopreservation in liquid nitrogen (LN). The controls had all treatments except LN. Bars with the same letter are nonsignificant at p ≤ 0.05