ศูนย์นวัตกรรมเทคโนโลยีหลังการเก็บเกี่ยว

Effect of gibberellic acid on sugar transport into petals of 'Madelon' rose flowers during bud opening.

Kuiper, D.; Reenen, H. S. van; Ribot, S. A.;

Acta Horticulturae Year: 1991 Issue: No. 298 Pages: 93-98 Ref: 11 ref.

1991

บทคัดย่อ

Roses (cv. Madelon) were harvested at 6 different stages of opening and kept in ice water in a cold room (4 deg C) for 3 h. Petals were then detached and placed on well plates containing holding solutions in a growth cabinet for 7 days. The holding solutions consisted of 0.4% sucrose, 0.8% D-glucose, 0.1 mM GA3, 2.2% KNO3, 0.2% D-glucose + 1.7% KNO3 and 0.2% D-glucose + 0.6% L-glucose. All holding solutions had the same osmotic potential and contained 1 p.p.m. AgNO3 to prevent bacterial growth. Fresh weight and petal surface area were determined at the beginning and end of the experiment. Three distinct groups of petals were evident. The outermost petals reached their full size on water only (water-dependent petals). The petals between the innermost and outermost petals reached their full size when sucrose was added to the water (sucrose-dependent petals). The innermost petals only reached full size when placed on a solution containing GA3 and sucrose (GA3-/sucrose-dependent petals). During flower bud development the ratio between the 3 groups changed with only water-dependent petals remaining eventually. KNO3 caused some increase in petal growth, the effect being independent of the presence of GA3. KNO3 possibly acted as an osmoticum. D-glucose in the presence of GA3 resulted in attainment of full petal size and could replaced sucrose. It is concluded that GA3 stimulates active sucrose uptake in GA3-/sucrose-dependent petals.