Photosynthetic and physiological responses of different peony cultivars to high temperature.

The POD activity of ‘Lu He Hong’ showed a decreasing trend, while the SOD activity increased first and then decreased.

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The SOD activity of Lu He Hong leaves increased first and then decreased with the extension of high temperature stress time, while Zhi Hong showed a trend of decreasing first and then increasing ( Figure 3B ).

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Under high temperature stress, the V J of ‘Lu He Hong’ showed an increasing trend, while φE0 decreased, indicating that the PQ pool had poor electron acceptance ability under high temperature stress, resulting in limited electron transfer ability of Q A from acceptor to Q B , thus the electron transfer from pheo to Q A resulted in Q A − , This eventually leads to a large accumulation of Q A − ( Kalaji et al., 2014b ) and a decrease in the efficiency of PSII electron transfer ( Öquist et al., 1992 ).

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