Liquid medium of half-strength MS medium containing 150 mL/L CW (M-1) in a 3-L bioreactor with 10 vvm DO (CS-9) was the best culture system (i.e., values were significantly superior to all other treatments; Table 1) for PLB growth and proliferation for the following reasons: as much as 10.1 g total FW of PLBs could be induced after the third subculture; 3.1 g was the average FW of PLBs