Under the media water content of 60% (referred to as
T1 in Fig. 9), plantlet roots grew well, but the shoot growth was weak. Under the media water content of 70%
(referred to as T2 in Fig. 9), both plantlet roots and shoots grew well. Under the media water content of 80%
(referred to as T3 in Fig. 9), roots grew weak, in terms of the number of roots and the length of roots. But