This study showed that the Pn in leaves at different development
stages decreased to negative value after chilling–light
treatment (Fig. 1), indicating that the utilization of reducing equivalents
through CO2 assimilation was completely inhibited under
the chilling–light treatment. So, although the CO2 assimilation
capacities developed incompletely in 20%A leaves (Fig. 1), it did
not contribute to the weak chilling–light tolerance in 20%A leaves.
In addition, the function of PSI and PSII, including light absorption,
energy transformation and electron transfer capacity, had developed
completely in the 20%A leaves, which was reflected by similar
values of Fv/Fm, WO, DI/Io, uRo and UPSII in leaves at different
development stages before the chilling treatment (Figs. 2, 3 and
7). The results suggest that the incomplete or imbalanced development
of photosystems was not the reason to cause the lower chilling
tolerance in young cucumber leaves.
This study showed that the Pn in leaves at different developmentstages decreased to negative value after chilling–lighttreatment (Fig. 1), indicating that the utilization of reducing equivalentsthrough CO2 assimilation was completely inhibited underthe chilling–light treatment. So, although the CO2 assimilationcapacities developed incompletely in 20%A leaves (Fig. 1), it didnot contribute to the weak chilling–light tolerance in 20%A leaves.In addition, the function of PSI and PSII, including light absorption,energy transformation and electron transfer capacity, had developedcompletely in the 20%A leaves, which was reflected by similarvalues of Fv/Fm, WO, DI/Io, uRo and UPSII in leaves at differentdevelopment stages before the chilling treatment (Figs. 2, 3 and7). The results suggest that the incomplete or imbalanced developmentof photosystems was not the reason to cause the lower chillingtolerance in young cucumber leaves.
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