Table 4.
Phytohormone concentrations (nmol l−1) detected in pooled xylem sap samples
| B. attenuata (n = 5) | B. menziesii (n = 5) | E. todtiana (n = 6) | |||||
|---|---|---|---|---|---|---|---|
| Well-watered | Drought | Well-watered | Drought | Well-watered | Drought | ||
| BAP | − | <LOQ | <LOQ | <LOQ | <LOQ | 0.124 | − |
| + | <LOQ | <LOQ | <LOQ | <LOQ | 0.118 | − | |
| BAPR | − | <LOD | <LOD | <LOD | <LOD | <LOQ | − |
| + | <LOD | <LOD | <LOD | <LOD | 0.092 | − | |
| DHZOG | − | 0.608 | 0.636 | 3.573 | 3.409 | 0.524 | − |
| + | 0.610 | 0.738 | 3.091 | 1.004 | 4.914 | − | |
| iPR | − | 0.048 | 0.066 | 0.057 | 0.092 | 0.107 | − |
| + | 0.072 | 0.066 | 0.110 | 0.060 | 0.125 | − | |
| tZOG | − | 4.12 | 4.82 | 38.37 | 29.78 | 7.15 | − |
| + | 3.06 | 4.56 | 38.77 | 29.17 | 117.32 | − | |
| tZR | − | 0.52 | 0.40 | 4.66 | 1.90 | 0.04 | − |
| + | 1.12 | 2.17 | 3.11 | 0.44 | 0.15 | − | |
| ABA | − | 131 | 67.0 | 139 | 90.9 | 487 | 14.3 |
| + | 89.9 | 45.0 | 69.1 | 69.2 | 268 | 18.9 | |
| SA | − | 590 | 583 | 929 | 941 | 62.3 | 219 |
| + | 598 | 736 | 1061 | 1036 | 42.9 | 42.9 | |
Xylem sap samples were pooled from all replicates within each treatment group to yield one sample per species per treatment. <LOD indicates concentration below limits of detection; <LOQ indicates concentration below limits of quantification; − indicates that no samples were available; BAP, N6-benzyladenine; BAPR, N6-benzyladenosine; DHZOG, dihydrozeatin-O-glucoside; iPR, N6-isopentenyladenosine; tZOG, trans-zeatin-O-glucoside; tZR, trans-zeatin riboside.