Figure 5: Three traces of PSI measurements from oscillations in PSI
reduction induced by spike in CO2, which demonstrate
varying levels of re-reduction during saturating flashes. Typically, a
saturating flash should fully oxidize PSI, but kinetics in electron
transport can change this. (a) Extreme re-reduction of PSI can be seen
during a saturation flash when PSI is most reduced, 40 s after beginning
an elevated CO2 pulse. This demonstrates a high level of
PSI-acceptor side limitation. (b) Less re-reduction of PSI during a
saturation flash is seen when PSI is less limited by electron acceptors
60 s after beginning a CO2 pulse. (c) After returning to
a new steady-state 100 s after beginning an elevated CO2pulse, PSI acceptor-side limitation is much diminished, and PSI
re-reduction is minimal.
Figure 6