. Poor roots cannot supply sufficient water for large shoots, so plants with high S/R ratios are unsuitable for active growth (Johkan et al., 2010). In our study, the S/R DW ratio was suboptimal under RB light (16.3) compared to RBW light (12.8) and FL (12.3). This observation is indicative of the poor growth of roots under RB light and also indicates that rootinduction is probably also dependent on the spectral quality of light