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. 2023 Jan 18;12(3):442. doi: 10.3390/plants12030442

Figure 8.

Figure 8

(a) Scheme of the simple model of plant production. DW is dry weight of shoot, Ahv(PAR) is the photosynthetic CO2 assimilation rate under this actinic light intensity (PAR), MCO2 is the molar mass of CO2, S(DW) is the green area per plant at this DW which shows the total area of illuminated leaves (or their parts) in the plant, tlight is the duration of light period at cultivation, tlight+dark is the total duration of light and dark periods at cultivation (24 h), 3.6 · 10−7 is correction coefficient for transition of units of Ahv(PAR) from µmol m−2s−1 to mol cm−2h−1, Rd is the average dark respiration rate which was calculated on the basis of all respiration rates in our work (0.769 µmol m−2s−1), hleaf is thickness of lettuce leaf (0.028 cm in accordance with [36]), ρH2O is the density of water, and FW(DW) is the total biomass of the plant (FW) at this DW. (b) The average light dependence of Ahv and its approximation. This dependence was calculated on the basis of all light dependences of Ahv measured in the current work. The standard equation from chemical kinetic was used for the approximation of Ahv(PAR). Ahvmax is the maximum rate of the photosynthetic CO2 assimilation, KA is the light intensity at Ahv(PAR) = 0.5 · Ahvmax, R2 is the determination coefficient for the approximation. (c) The average dependence of the green area per plant (S) on DW and its approximation. This dependence was calculated on basis of Figure 1 and Table 1 in the current work (all investigated variants). The standard equation from chemical kinetics was used for the approximation of S(DW). Smax is the maximum S, KS is the DW at S(DW) = 0.5 · Smax, R2 is the determination coefficient for the approximation. (d) Average dependence of FW on DW and its approximation. This dependence was calculated on the basis of Table 1 in the current work (all investigated variant). The standard linear equation was used for the approximation of S(DW). KFW is the coefficient of the linear regression, R2 is the determination coefficient for the approximation.