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Table 3 Photosynthetic performance as well as pigment contents of Col-0 and adg1-1/tpt-2 plants grown on agar plates containing 1/2 strength MS medium (A) or 1/2 MS supplemented with 50 mM Suc (B) under HL-conditions

From: Defects in leaf carbohydrate metabolism compromise acclimation to high light and lead to a high chlorophyll fluorescence phenotype in Arabidopsis thaliana

Plant line Fv/Fmratio ΦPSII Chl content (mg·g-1 fw) Chl a/bratio Carotenoid content (μg·g-1 fw)
A Plants grown on 1/2 MS
Col-0 0.76 ± 0.01 0.34 ± 0.03 1.43 ± 0.10 3.02 ± 0.14 51.3 ± 4.0
adg1-1/tpt-2 0.35 ± 0.10 b 0.06 ± 0.05 a 0.85 ± 0.14 b 2.22 ± 0.08 a 34.4 ± 6.0 c
B Plants grown on 1/2 MS + 50 mM Suc
Col-0 0.78 ± 0.01 0.35 ± 0.02 1.64 ± 0.21 2.87 ± 0.06 49.8 ± 7.7
adg1-1/tpt-2 0.63 ± 0.06 c 0.21 ± 0.04 c,c 1.55 ± 0.21 c 2.66 ± 0.03 a 59.3 ± 9.0
  1. Photosynthesis parameters were determined with the Imaging-PAM fluorometer using the integrated light source. Fv/Fm ratios were determined after the leaves were dark-adapted for at least 15 min. The OPSII values refer to steady state photosynthesis, which was attained 7-10 min after onset of illumination at a PFD of 300 μmol·m-2·s-1. For pigment and carbohydrate measurements leaves were harvested in the middle of the light period. The data represent the mean ± SE of n = 4 measurements. Significant differences between the data were analyzed according to the Welch test. The letters as superscripts denote a,aP < 0.01, b,bP < 0.02, c,cP < 0.05. Plain letters = comparison of adg1-1/tpt-2 with Col-0 at the respective growth conditions, italic letters = comparison of adg1-1/tpt-2 plants grown on 50 mM Suc with those grown on 1/2 MS as a control. There were no significant differences found between Col-0 grown either on 1/2 MS or 50 mM Suc.