The Journal of Horticultural Science & Biotechnology
Vol. 85 No: 1
Effect of abscisic acid on the distribution of exogenous carbon derived from sucrose applied to cut Eustoma flowers
H. SHIMIZU-YUMOTO, M. KONDO, Y. SANOH, A. OHSUMI and K. ICHIMURA
Pulse treatment with 4% (w/v) sucrose plus 10 μM abscisic acid (ABA) suppressed leaf damage caused by sucrose and extended the vase-life of cut Eustoma flowers.
To clarify the translocation of exogenous carbon supplied from the sucrose, or sucrose-plus-ABA solutions, 13C-labelled sucrose was used.
Immediately after a 24-h pulse treatment (i.e., day-0), concentrations of exogenous carbon derived from the applied sucrose accumulated to greater levels in the leaves of sucrose-only-treated, than of sucrose-plus-ABA-treated flowers.
The percentage distribution of exogenous carbon derived from the sucrose applied was 40% in the leaves of the sucrose-only treatment, compared to 15% for the sucrose-plus-ABA treatment.
These results suggest that ABA suppressed the accumulation of exogenous sucrose in the leaves, and thus avoided the induction of leaf damage.
Exogenous carbon derived from the applied sucrose increased in open flowers and flower buds in both treatments on day-2. On day-5, exogenous carbon derived from the applied sucrose increased slightly in flower buds and remained almost constant in open flowers in both treatments.
In the presence of ABA, exogenous carbon derived from the applied sucrose was lower on day-2 and day-5 in open flowers and flower buds.
However, total carbon concentrations were almost identical in open flowers and flower buds for both treatments on day-5. Thus, extension of the vase-life of cut Eustoma flowers in the sucrose-plus-ABA treatment is proposed to be due to the translocation of endogenous carbon to flowers and flower buds.
ISHS members & other users
(PDF 799272 bytes)
Go back to previous page