Table 2.
Classification of treatments with foliar applications of brassinosteroid analogue (DI-31) based on the decrease in the maximum quantum efficiency of photosystem II (Fv/Fm ratio) (DQE) in lulo (Solanum quitoense Lam.) plants under drought stress at 80 days after transplanting (DAT).
| DQE (%)a | Classification | Treatments studied |
|---|---|---|
| DQE ≤25 | Good tolerance | DI-31 2 mL·L−1, DI-31 4 mL·L−1, DI-31 8 mL·L−1 |
| 26 ≥ DQE ≤41 | Moderate tolerance | DI-31 1 mL·L−1 |
| 42 ≥ DQE ≤55 | Low tolerance | Drought-stressed plants |
| DQE ≥56 | Very low tolerance | - |
a
DQE - decrease in the maximum quantum efficiency of photosystem II (Fv/Fm ratio) in lulo plants exposed to drought and sprayed with DI-31 compared to untreated well-irrigated plants.