faster under continuous darkness and completed within 4–5
months in comparison with the 6–8 months taken by treatment
with light after culture initiation (Gopal et al., 1998). However,
ourin vitrohydroponic culture system enables completion ofin
vitromicrotuberization within only 30 days, which is expected
to considerably restrict the culture and labor cost.
Consequently, the so called ‘‘in vitro hydroponic system’’
and the use of two alternative materials (filter paper or cotton
layer) to serve as carrier substrata had showed their efficiency in
producing a large number of high quality microtuber in a
shorter period with acceptable cost. With more studies to be
carried out based on this original work, production of potato
and other hygrophilous microtubers will be pushed into the
commercial scale in the near future