Table I.
Content of ABA and stomatal conductance of isoprene-emitting leaves of P. australis and P. alba and nonemitting leaves of P. fortunei and P. persica
In another batch of leaves the isoprenoid pathway leading to isoprene synthesis was inhibited by feeding 20 μm fosmidomycin. Asterisks (***) represent statistical separation between means of the two treatments (−/+ fosmidomycin) for each plant species at P ≤ 0.01 (n = 10 in P. australis, n = 5 for all other species; Tukey's test).
| Treatment | ABA Content | Stomatal Conductance | ||
|---|---|---|---|---|
| pmol g (fw)−1 | mol m−2 s−1 | |||
| Isoprene-emitting leaves | P. australis | P. alba | P. australis | P. alba |
| Isoprene emitting (−fosmidomycin) | 22.9 ± 2.6 | 44.4 ± 6.9 | 0.25 ± 0.04 | 0.24 ± 0.06 |
| Isoprene inhibited (+fosmidomycin) | 15.9 ± 3.1*** | 20.8 ± 8.1*** | 0.36 ± 0.09*** | 0.34 ± 0.07*** |
| Nonemitting leaves | P. fortunei | P. persica | P. fortunei | P. persica |
| −Fosmidomycin | 6.4 ± 0.7 | 51.2 ± 6.6 | 0.13 ± 0.03 | 0.08 ± 0.01 |
| +Fosmidomycin | 8.6 ± 1.7 | 34.4 ± 4.9*** | 0.09 ± 0.04 | 0.11 ± 0.01*** |