TABLE 3.
Mean (± standard deviation) values of leaf photosynthetic traits and water potential at conclusion of the pot desiccation (PD treatment), source of variation, and p-values of Prunus dulcis cultivars subjected to PD and well-watered (WW) irrigation treatments.
| iWUE (mmol CO2 mol–1 H2O) |
Ψmin (MPa) |
AN (μmol CO2 m–2s–1) |
E (mmol H2O m–2s–1) |
gs (mmol H2O m–2s–1) |
Ψpd (MPa) |
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| WW | PD | WW | PD | WW | PD | ||||
| Cultivar (C) | |||||||||
| Avijor | – | –2.94 ± 0.43 ab | 8.44 ± 2.31 a | 5.33 ± 0.15 b | 1.14 ± 0.12 c | 374.68 ± 19.59 b | 51.00 ± 6.08 cd | –0.70 ± 0.03 a | –2.93 ± 0.29 d |
| Isabelona | – | –2.83 ± 0.44 a | 6.16 ± 1.70 b | 6.45 ± 0.18 a | 0.95 ± 0.07 c | 530.95 ± 27.77 a | 41.80 ± 3.18 d | –1.00 ± 0.09 b | –2.39 ± 0.29 c |
| Soleta | – | –3.24 ± 0.49 b | 7.26 ± 1.91 ab | 6.30 ± 0.06 a | 1.19 ± 0.07 c | 531.85 ± 20.21 a | 53.83 ± 3.53 c | –0.95 ± 0.05 b | –3.38 ± 0.12 e |
| Treatment (T) | |||||||||
| WW | 2.06 ± 0.18 b | –1.83 ± 0.08 a | – | – | – | – | – | – | – |
| PD | 2.18 ± 0.12 a | –4.18 ± 0.10 b | – | – | – | – | – | – | – |
| Source of variation | |||||||||
| Block | 0.3920 | 0.3267 | 0.6810 | 0.2318 | 0.8034 | 0.2007 | |||
| C | 0.3865 | <0.0001 | <0.0001 | <0.0001 | <0.0001 | <0.0001 | |||
| T | 0.0277 | 0.0002 | 0.0624 | <0.0001 | 0.0370 | <0.0001 | |||
| C x T | 0.1456 | 0.8410 | 0.2343 | 0.0003 | 0.0084 | <0.0001 | |||
gs, stomatal conductance; Ψmin, minimum midday water potential; AN, net photosynthesis; E, transpiration rate; WUE, water use efficiency; Ψpd, pre-dawn water potential. Different letters within columns indicate statistical differences among means (p ≤ 0.05). Bold values indicate significant differences between cultivars.