Apparatus for culturing plantlets and process for culturing the same by using said apparatus

An apparatus for culturing plantlets by means of photoautotrophic growth, comprising principal constituents consisting essentially of a light transmittable and enclosed culture vessel having at least one vent at the upper portion thereof, a carbon dioxide-rich air supply chamber which is installed in contact with the bottom of the culture vessel, and a culture solution tank for supplying the culture vessel with a culture solution, wherein the supply chamber is connected to a supply source of carbon dioxide-rich air and is allowed to communicate with the culture vessel through a plurality of vertical fine tubes each of which has an opening on each end and which are installed at the bottom of the culture vessel so that an upper end of each of the tubes protrudes beyond the liquid surface of the culture solution in the culture vessel, and the culture solution tank is connected to the culture vessel through tubing and is equipped with an air pump for supplying the culture vessel with the culture solution.