Fig. 1. Growth traits and root activity of rapeseed seedlings under different lights.

The units of weight, specific leaf area, and root activity are “g,” “cm² g⁻¹,” and “µg g⁻¹ h⁻¹,” respectively. RB red–blue light, RBG red–blue–green light, RBW red–blue–white light, RBY red–blue–yellow light, W white light. Vertical bars are means ± SDs (n = 3). Bars labeled with lowercase letters are significantly different by Duncan’s test at the P < 0.05 level