Figure 4. The change in parameters including W_k, RC_QA, φ _Po, φ _Eo and ψ _Eo involved in electron transport chain of PSII in bean (V. faba L.) source leaves at 1300 h from the 1^st to 21^st day after removing the sink of roots and pods.

Each value represents the mean of five replicates, and error bars represent ± S.E. The asterisks *, ** and *** indicate significant difference at P<0.05, 0.01 and 0.001 between the control and treatment, respectively.