Table 3.

Trial 2, 2003. The influence of different sugars and concentrations applied as a root drench on leaf chlorophyll and carotenoid concentrations, photosynthetic rates, and chlorophyll fluorescence of transplanted birch (Betula pendula Roth.).

SugarChlorophyll concentration (μg/g fresh weight)Carotenoid (μg/g fresh weight)Photosynthetic rate (CO2 pmol/m/s)Fv/Fm
Week 6Week 24Week 6Week 24Week 6Week 24Week 6Week 24
25 g/L82.1ns83.2ns7.6ns9.3ns7.4ns7.0ns0.83ns0.83ns
50 g/L61.3*78.6ns5.3*10.2ns5.3*6.1ns0.66ns0.79ns
70 g/L57.0*80.4ns4.8*7.8ns5.0*6.8ns0.62*0.80ns
25 g/L75.4ns70.1ns6.3*7.7ns7.8ns7.2ns0.79ns0.82ns
50 g/L66.8ns79.0ns6.1*9.2ns5.3*6.3ns0.81ns0.82ns
70 g/L50.2*78.3ns5.2*7.0ns5.3*7.2ns0.60*0.78ns
25 g/L89.0ns82.5ns8.4ns8.7ns8.4ns6.2ns0.81ns0.81ns
50 g/L60.2*79.3ns5.0*9.9ns4.3*6.5ns0.67ns0.82ns
70 g/L58.1*84.5ns6.3*10.2ns5.5ns7.1ns0.70ns0.80ns
  • All chlorophyll fluorescence values (Fv/Fm) mean of 30 leaf readings. All photosynthesis, chlorophyll, and carotenoid values are mean of two leaves on each of five trees.

  • LSD = least significant difference; ns = not significant;

  • * = P ≤ 0.05 (control versus sugar treatment mean within a column).