FIGURE 6.

Ribose inhibits growth of rbsk-1 and rbsk-2. 10-Day-old Arabidopsis seedlings grown in constant light on solid GM supplemented with A, 1% sucrose; B, 1% xylose; C, 1% ribose and quantification of seedling diameter. Experiments were performed at least three times each. Two rbsk mutant biological replicates were compared with one biological replicate of WT as a control group as shown. Scatter plots show diameter measurements of >25 seedlings from one representative experiment. D, graphical representation of μg of ribose/mg of fresh weight of 10-day-old Arabidopsis seedlings grown in liquid GM supplemented with 1% sucrose determined by mass spectrometry as compared with ribose standards run at the same time and normalized to fresh weight of the seedlings. 5 technical replicates were analyzed for each of two rbsk mutant biological replicates and one biological replicate of WT as a control group as shown. Scatter plots show all data points with mean ± S.D. indicated. All asterisks indicate statistical difference from WT. **, p < 0.01; ***, p < 0.001; ****, p < 0.0001.