Figure 6.

Correlations between the light-use efficiency of biomass production (total dry biomass produced per incident PFD during the four-day growth period) and (A) (F_m′ − F)/F_m′ = F_v′/F_m′ × q_P (as an estimate of the light-use efficiency of PSII photochemistry) or (B) the percent of the xanthophyll cycle pool converted to zeaxanthin (Z) and antheraxanthin (A) in Lemna gibba fronds grown under six PFDs ranging from 50 to 1000 µmol m⁻² s⁻¹. Mean values ± standard deviations, n = 3 or 4. Data for PFDs of 100 to 700 µmol m⁻² s⁻¹ were calculated from [2]. V = violaxanthin.