P668 and modified Knudson C contained 2% (w/v)
sucrose, whereas 3% sucrose was added to half and full strength MS
media. Agar (Bacteriological, Agar No. 1, Oxoid Ltd, Bastingstoke,
England) (0.6%, w/v) was used to solidify all the media dispersed in
Petri dishes (90 mm) that were subsequently used for sowing the
seeds, while 0.7% (w/v) agar was used to solidify the media in
culture jars, which were used for growing germinated protocorms
for 8 weeks.