Retarded growth of p5cs2 mutants. A: Sixteen-day-old seedlings grown in sterile culture under short-day conditions on MS medium with 30 mM sucrose (Suc) and additionally 2 mM proline (Pro) or 50 mM NaCl. B: Rosette diameters of plants cultivated in soil under short-day conditions. The arrow indicates the time of fertiliser application, error bars indicate SD of 10≤N≤12 individuals. The size difference between p5cs2-1 mutants and the wildtype was significant (p<0.05 by student’s t-test) for all timepoints.