Figure 10From: Mechanisms by which the infection of Sclerotinia sclerotiorum (Lib.) de Baryaffects the photosynthetic performance in tobacco leavesThe effect of K 2 C 2 O 4 and KCl treatment on the PSI activity. The PSI activity of the treated leaves were measured with an M-PEA (Hansatech Instrument Ltd., UK). The induction curve of MR820 nm of the leaves obtained by saturating red light showed a fast oxidation phase and a following reduction phase. The initial slope of the oxidation phase of MR820nm at the beginning of the saturated red light indicates the capability of P700 to get oxidized, which is used to reflect the activity of PSI.Back to article page