A temporary submerged bioreactor (10) for in vitro production of differentiated plant biomass comprises a mesh defining one or more transparent sidewalls (14) and a plurality of pores (18) for receiving plant material. A growth chamber (12) with a bottom (16) is provided. The bioreactor (10) includes a flexible bag (20) formed from a transparent material, the flexible bag (20) includes a sealable opening, and the growth chamber (12) is a liquid medium (22). Dimension to be accommodated together. The bioreactor (10) also includes an outer chamber (24) with one or more transparent side walls (26). The outer chamber (24) is formed so as to correspond to the shape of the growth chamber (12), and has a size that allows the growth chamber (12) in the flexible bag (20) to be accommodated. The mesh bottom (16) of the chamber (12) faces the bottom (28) of the outer chamber (24) that is intended to rest on the support surface in use. The movement of the growth chamber (12) in the outer chamber (24) is such that the mesh bottom (16) of the growth chamber (12) moves in a direction toward and away from the bottom (28) of the outer chamber (24). Restricted to movement along a single axis. The bioreactor (10) further comprises a drive mechanism (30), which when the growth chamber (12) and the flexible bag (20) are housed in the outer chamber (24), A first position where the mesh bottom (16) of the growth chamber (12) is located at or near the bottom (28) of the outer chamber (24) and a mesh bottom (16) of the growth chamber (12) is provided. Arranged to selectively drive movement along a single axis (A) of the growth chamber (12) between a second position spaced from the bottom (28) of the outer chamber (24). ing.分化した植物バイオマスのインビトロ産生のための一時的浸漬式バイオリアクタ（１０）は、１つ以上の透明な側壁部（１４）および植物材料を受ける複数の孔（１８）を画成しているメッシュ底部（１６）を備えた生育チャンバ（１２）を備えている。バイオリアクタ（１０）は、透明材料から形成されたフレキシブルバッグ（２０）を備え、該フレキシブルバッグ（２０）は、封止可能な開口部を備え、かつ生育チャンバ（１２）を液体培地（２２）と一緒に収容する寸法を有する。またバイオリアクタ（１０）は、１つ以上の透明な側壁部（２６）を備えた外側チャンバ（２４）を備えている。前記
