Table 3.
Predawn leaf water potentials (Ψpd) measured in field tests of C. arabica.
| Cultivar | Y | Irrigated (I) | Non-Irrigated (NI) | ||||
|---|---|---|---|---|---|---|---|
| U | WS | U | WS | ||||
| I59 | 2008 | -0.23 ± 0.09 | -0.38 ± 0.10 | -0.21 ± 0.05 | -0.80 ± 0.12 | ||
| Rubi | 2008 | -0.19 ± 0.02 | -0.22 ± 0.07 | -0.19 ± 0.06 | -1.88 ± 0.26 | ||
| I59 | 2009 | -0.06 ± 0.02 | -0.12 ± 0.00 | -0.07 ± 0.02 | -0.59 ± 0.03 | ||
| Rubi | 2009 | -0.06 ± 0.02 | -0.11 ± 0.00 | -0.13 ± 0.04 | -1.20 ± 0.16 | ||
| Icatú | 2010 | nd | <-4.0 | ||||
| Rubi | 2010 | nd | <-4.0 | ||||
| Obatã | 2010 | nd | <-4.0 | ||||
| I59 | 2010 | nd | <-4.0 | ||||
| Cultivar | Y | Irrigated (I) | Non-Irrigated (NI) | ||||
| U1 | WS | U2 | U1 | WS | U2 | ||
| I59 | 2008 | -0.41 ± 0.03 | -0.37 ± 0.05 | -0.14 ± 0.03 | -0.66 ± 0.03 | -1.35 ± 0.09 | -0.15 ± 0.03 |
| Rubi | 2008 | -0.28 ± 0.05 | -0.20 ± 0.04 | -0.17 ± 0.04 | -0.45 ± 0.04 | -1.96 ± 0.13 | -0.18 ± 0.03 |
Young (top) and adult (bottom) plants were grown under irrigated (I) or non-irrigated (NI) conditions. Ψpd values are expressed in mega-Pascal (MPa) and standard deviations (n = 9 leaves) are also indicated. For young plants, Ψpd was measured during the rainy season (U: unstressed) and the dry season (WS: water stress). For adult plants, Ψpd were measured only during the dry season (WS) under irrigated (I) or with the irrigation suspended for 90 days (NI) conditions. The points U1, WS and U2 corresponded to measurements before, during and after the return of irrigation, respectively. nd: Ψpd potentials were not determined but ranged from -0.1 to -0.2 MPa under irrigation. The year of analysis (Y) is also indicated.