Clones of Ficus benjamina L. differed by up to 18% in leaf net photosynthetic rates (PN) measured at various leaf positions. Differences in stomatal conductance (Gs), internal CO2 concentration (CI), and transpiration (T) were observed in one study. The uppermost leaves showed lower PN and higher T rates than lower leaves. Total leaf area, total fresh or dry leaf weight, and total biomass above soil differed among clones. The difference in above-ground dry weight between the fastest- and slowest-growing clones increased during growth, reaching 37% at the end of the experiments. Photosynthetic measurements could not be correlated with growth, although, in one study, the fastest-growing clones also had the highest PN rates.
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