Sucrose prevents foliage desiccation in cut Leucadendron `Silvan Red' during cool storage
Rodney B. Jones
Postharvest Biology and Technology Vol: 6 Issue: 3-4 Pages: 293-301.
1995
บทคัดย่อ
Pulsing Leucadendron `Silvan Red' stems with sucrose solutions of 200
g l-1 (20%) or higher for 24 h at 1°C prevented leaf desiccation
during 42 days dry storage at 1°C. Stems pulsed with sucrose
for 24 h at 20°C absorbed significantly more sucrose than stems
pulsed at 1°C. Despite this, leaf desiccation was significantly
higher in stems pulsed at 20°C, indicating a possible
toxic effect due to an oversupply of sucrose. Fresh weight was not affected by
sucrose pulse concentration before or after storage. Sorbitol and mannitol
pulses also had no effect on flower fresh weight, but accelerated leaf
desiccation, suggesting that the inhibition of leaf desiccation by sucrose was
not a result of improved leaf hydration. Total soluble sugar content in leaf
tissue declined during storage; this decline was significantly inhibited by a 
20%
pre-storage sucrose pulse. A 24 h pulse with 14C-sucrose indicated
that sucrose was distributed primarily to the leaves. It is possible that
exogenous sucrose prevented leaf desiccation in Leucadendron by
maintaining membrane integrity.