Results
Light quality influenced the vegetative growth parameters of potato plantlets in vitro. Light treatments with mixtures of RBor RBG were more beneficial to the vegetative growth of potato plantlets in vitro than the FL treatment (Table 2, Fig. 1). More-over, the addition of G to the composite spectrum of R and B was favorable for the vegetative growth of potato plantlets in vitro and increased stem diameter, leaf area, DM, health index and root activity (Table 2, Fig. 1). Stem height under R630B and R660B was significantly lower than that under FL, but stem height under R630BG and R660BG approximated stem height under FL, indicating that the addition of G contributed to increased stem height.