Alteration of performance index (PI) that deduced by JIP-test analysis of fluorescence transients.

<p>Calculations of each parameter refer to the method of Yusuf et al. (2010). (A) Alteration of PI for energy conservation from exciton to the reduction of PSI end acceptors (<i>PI</i>_<i>Total</i>). (B) Alteration of PI for energy conservation from exciton to the reduction of intersystem electron (<i>PI</i>_<i>ABS</i>). Experiments were repeated for three times, and means were average values of the parameters. Independent-samples <i>t</i> test was used to determine statistical differences. <i>Bars</i> show standard deviation. Different letters indicate statistical difference significance at <i>P</i> < 0.05 among the treatments. CK was control that treated with sterilized water, SNP was plant treated with SNP, P+L was plant treated with PTIO and L-NAME. 30 means the culture temperature of 30°C, and 4 means the culture temperature of 4°C.