Table 5.
Effects of inoculation with ACC deaminase-producing PGPRs on the chlorophyll contents, Pn, Gs, and water use efficiency (WUE) of grapevine leaves under non-drought (ND) and drought stress (DS) conditions.
| Drought stress | Treatments | Chlorophyll contents (mg/g) | Pna (μmol/m2s) | Gsb (mmol/m2s) | WUEc (μmol/mmol) |
|---|---|---|---|---|---|
| ND | CK | 2.62±0.05c | 8.01±0.55cd | 80.73±3.58d | 1.40±0.12d |
| T1 | 3.05±0.03b | 10.11±0.47b | 93.46±3.64c | 2.52±0.16b | |
| T2 | 3.09±0.05b | 10.27±0.40b | 112.10±4.34b | 2.57±0.11b | |
| T3 | 3.43±0.08a | 11.88±0.38a | 144.78±5.68a | 3.04±0.16a | |
| DS | CK | 1.96±0.01d | 5.66±0.49e | 26.85±2.45g | 0.96±0.08e |
| T1 | 2.58±0.07c | 7.36±0.49d | 41.05±2.93f | 1.46±0.11d | |
| T2 | 2.71±0.10c | 7.02±0.31d | 66.51±3.78e | 1.36±0.11d | |
| T3 | 3.16±0.15b | 9.13±0.52bc | 80.04±3.61d | 1.95±0.12c |
a
Pn: photosynthetic rates.
b
Gs: stomatal conductance.
c
WUE: water use efficiency.
Values are the mean±SE (n=3). Different lowercase letters indicate significant differences according to Duncan’s multiple range test at the P<0.05 level.