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Exogenously supplied sucrose improves the postharvest quality of Grevillea 'Sylvia' inflorescences

Ligawa, J. K., Joyce, D. C. and Hetherington, S. E.

Australian Journal of Experimental Agriculture Year: 1997 Vol: 37 Issue: 7 Pages: 809-816.

1997

บทคัดย่อ

Exogenously supplied sucrose improves the postharvest quality of Grevillea 'Sylvia' inflorescences.

Short vase life (3-7 days) is a problem with inflorescences of Grevillea used as cut flowers. A series of 4 experiments were conducted using Grevillea cv. Sylvia to determine whether short vase life is associated with depletion of sugars. In experiment 1, the effects of leaf retention on stems and a range of sucrose concentrations (0-6% w/v) in vase solutions on vase life were investigated. In experiment 2, the relationship between inflorescence maturity (4 stages) and sucrose supply was studied. In experiment 3, the effects of sucrose concentration as a short period pulse and pulsing duration were determined. In experiment 4, simulated handling and transport was undertaken to gauge the usefulness of sucrose pulsing. Experiments were conducted at 22 plus or minus 2 deg C, RH 50-80%. All vase solutions contained 10 mg chlorine/litre to suppress microbial growth. In experiment 1, the best solution was 3% sucrose, giving a mean vase life of 10.1 plus or minus 0.2 days (44% longer than the control).

 In experiment 2, flowers picked at the 'early looping' stage and provided with 3% sucrose had the best vase life (12 days) and visual appeal. In experiment 3, sucrose pulsing (10%) for 6-24 h extended vase life by at least 1 day. The presence of leaves shortened vase life of both sucrose-pulsed and non-pulsed inflorescences by about 1 day. In experiment 4, storage for 5 days at 5 deg (handling/transport simulation) did not shorten vase life. Sucrose pulsing (10%) before simulated handling/transport did not significantly increase vase life. To achieve the best floral display, Grevillea inflorescences should be picked at the 'early looping' stage of maturity and placed in a vase solution containing 3% sucrose.