Fig. 4.

δ¹³C abundance in nodules of L. japonicus plants grown under a normal photoperiod, and after 24h and 72h of continuous dark periods, subjected to 2h of ¹³C pulse labelling, and 1h of chase after the completion of the 2h ¹³C pulse labelling. Bars represent means (±SE) of six biological replications (three plants each). Within each light/dark condition, the statistical analysis refers to the comparison between the different labelling treatments. Significant differences (P < 0.05) are indicated by different letters.