| ADP | Adenosine diphosphate |
| ATP | Adenosine triphosphate |
| Chl | Chlorophyll |
| ChlF | Chlorophyll fluorescence |
| Cyt | Cytochrome |
| ETC | Electron-transport chain |
| FD | Ferredoxin |
| FRN | Ferredoxin-NADP+ reductase |
| H+ | Hydrogen proton |
| LHCI | Light-harvesting complex of photosystem I |
| LHCII | Light-harvesting complex of photosystem II |
| NADPH | Reduced nicotinamide adenine dinucleotide phosphate |
| NADP+ | Oxidized nicotinamide adenine dinucleotide phosphate |
| OEC | Oxygen-evolving complex |
| PC | Plastocyanin |
| Pheo | Pheophytin |
| Pi | Inorganic phosphate |
| PPFD | Photosynthetic photon flux density |
| PQ | Plastoquinone |
| PQH2 | Plastohydrolquinol |
| PSI | Photosystem I (P700) |
| PSII | Photosystem II (P680) |
| PVC | Polyvinyl chloride |
| QA | Quinone A |
| QB | Quinone B |
| RC | Reaction center |
| RH | Relative humidity |
| Tair | Air temperature |
| VPDair | Vapor pressure deficit of the air |
| WS | Water stress |
| WW | Well-watered |
| ΨmSoil | Soil matric potential |