| Pn | Net photosynthetic rate |
| gs | Stomatal conductance |
| SPAD | Soil and Plant Analyzer Development (the relative content of chlorophyll) |
| T | Transpiration rate |
| WUE | Water use efficiency |
| Ci | Intercellular CO2 concentration |
| SG | Starch grains |
| GL | Grana lamellae |
| VPD | Vapor pressure deficit |
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