| Abbreviation | Definition |
|---|---|
| PPS | Photosynthetic Pigment System |
| PPS | Photosynthetic Pigment Systems |
| PQ | Photosynthetic Quotient |
| PREF | Priest River Experimental Forest |
| PS | Photosystem |
| PSES | Plant Soil and Entomological Sciences |
| PSN | PhotoSyNthesis |
| PSND | Peanut Stem Necrosis Disease |
| PTA | Plasma Thromboplastin Antecedent |
| PTP | Potato Tuber Peroxidase |
| PTPV | Peanut Top Paralysis Virus |
| PUF | Photosynthetic Unit Function |
| PVC | Pre-Vacuole Compartment |
| PVP | Plant Variety Protection |
| PVT | Potato Virus T |
| PVV | Potato Virus V |
| PVX | Potato Virus X |
| PVY | Potato Virus Y |
| PWP | Permanent wilting point |
| QAL | Queen Anne's Lace |