Table II.
Effects of PCMBS treatment on sugar exudation from cut leaves of A. meridionalis and potato
The PCMBS concentration before leaf preincubation was 1 mm. The calculated apoplastic PCMBS concentration after preincubation was 5.2 ± 0.8 mm in A. meridionalis and 4.6 ± 0.7 mm in potato. Controls were treated with dimethyl sulfoxide (DMSO) only. Data are represented in nanomoles per gram fresh wt per hour and represent the mean ± sd from 16 independent measurements. Those determined by Fisher's protected lsd test to be significantly different (significance level 0.05) from controls are in bold.
| Sugars
|
A. meridionalis
|
Potato
|
||||
|---|---|---|---|---|---|---|
| Control PCMBS | % of control | Control | PCMBS | % of control | ||
| Glc | 34 ± 12 | 15 ± 6 | 44 | 316 ± 106 | 21 ± 10 | 7 |
| Fru | 26 ± 10 | 8 ± 3 | 31 | 333 ± 89 | 22 ± 10 | 7 |
| Suc | 35 ± 10 | 28 ± 6 | 80 | 867 ± 245 | 16 ± 9 | 2 |
| Raffinose | 10 ± 3 | 16 ± 6 | 160 | n.d.a | n.d. | — |
| Stachyose | 18 ± 8 | 43 ± 12 | 239 | n.d. | n.d. | — |
| Sum of sugars | 123 ± 35 | 110 ± 28 | 89 | 1,516 ± 361 | 59 ± 26 | 4 |
a
n.d., Not detectable