Seedling growth of Bletilla formosana for 6 wk after sowing on MS medium. (A) Fresh seeds; (B) fresh seeds were dried for 24 h with air-drying in laboratory conditions prior to LN; (C) fresh seeds were dried for 24 h with silica gel prior to LN; and (D) fresh seeds were dried for 24 h with silica gel, vitrification (0.06 M sucrose solution + LS + PVS2
1 h) prior to LN. Bar = 1 mm.