บทคัดย่องานวิจัย

หมวดหมู่ : ฐานข้อมูลงานวิจัย

Processes and xylem anatomical properties involved in rehydration dynamics of cut flowers.

Meeteren, U. van; Ieperen, W. van; Nijsse, J.; Keijzer, K.; Scheenen, T.; As, H. van;

Acta Horticulturae Year: 2001 Issue: No. 543 Pages: 207-211 Ref: 12 ref.

2000

บทคัดย่อ

Processes and xylem anatomical properties involved in rehydration dynamics of cut flowers.

Physical processes related to the removal of air embolisms during the first hours of vase life were modelled. Simulation results of this model were compared with measurements of hydraulic conductance (HC) recovery obtained from excised chrysanthemum (Dendranthema grandifolium [D. morifolium] cv. Cassa) stem segments. The process of HC recovery consists of an initial fast component followed by a slower second component, which may last for hours. These components were also observed in the measured HC recovery patterns of stem segments. Cryo-SEM images of air embolisms in xylem vessels revealed that air gathers in the large diameter vessels during the first phase of the HC recovery process. In addition, the success of air removal largely depends on xylem anatomical properties. Measurements on excised stem segments of one chrysanthemum cultivar,grown under similar conditions, but harvested at different cutting heights clearly showed different restoration patterns. A lower initial HC resistance of a

stem segment before air entrance usually correlates with a poor recovery of HC after reapplying water.