Figure 1.

(A) Accumulation of frond area (% relative to frond area at the beginning of the experiment) over four days of growth, (B) average doubling time in frond area over this four-day period, and (C) light-use efficiency of frond area production (total frond area produced relative to incident PFD during the four-day growth period) in Lemna gibba plants under growth PFDs of 50 (green) or 1000 (yellow) µmol m⁻² s⁻¹. Mean values ± standard deviations; n = 7 for 50 µmol photons m⁻² s⁻¹; n = 3 for 1000 µmol photons m⁻² s⁻¹. A significant difference between the growth PFDs is denoted by asterisks in (C); *** = p < 0.001; n.s. = not significantly different.