Erratum to: Planta DOI 10.1007/s00425-009-1049-5 {#Sec1}
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Unfortunately, the authors' contribution was missing and the Fig.  2 legend was wrong in the previous version. 

The original version of authors' contribution and the Fig.  2 caption are given below. 

**Authors' contribution:** O. V. Voitsekhovskaja and K. Pawlowski contributed equally to this manuscript. 

**Figure 2 legend:**

**Fig.  2** Time course of sugar contents (μmol/g fresh weight) in leaves (*upper panel*) and roots (*lower panel*) of *D. glomerata*.  Plants were grown in aerated hydroponic culture at 16 h light, 8 h dark or 14 h light, 10 h dark, respectively, and samples (in duplicate) were taken for determination of sugar content in the middle of the light phase, 30 min before the end of the light phase, in the middle of the dark phase and 30 min before the end of the dark phase.  The plants grown at 16 h light received 5 mM KNO~3~ each week.  The KNO~3~ in the growth medium of the plants grown at 14 h light had not been replenished since 3 weeks at the harvesting date

The online version of the original article can be found under doi:10.1007/s00425-009-1049-5.