| PSII | Photosystem II |
| Chl | Chlorophyll |
| ROS | Reactive oxygen species |
| Pn | Net photosynthetic rate |
| NPQ | Non-photochemical quenching |
| Fv/Fm | Maximum quantum yield of PSII |
| ΦPSII | Effective quantum yield of PSII |
| Qp | Photochemical quenching |
| Ql | Fraction of PSII centers that are open |
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