Keeping quality and prolonging the postharvest longevity of spray chrysanthemum cv. White Polaris.
Florez-Roncancio, V. J.; Castro, C. E. F. de; Dematte, M. E. S. P.;
Bragantia Year: 1996 Vol: 55 Issue: 2 Pages: 299-307 Ref: 30 ref.
1996
บทคัดย่อ
Cut flowers of spray chrysanthemum (Dendranthema grandiflorum) cv. White Polaris were harvested and treated in pulsing solutions. The flowers were harvested in commercial greenhouses and transported to the laboratory where the whole stem and inflorescence were immersed in tap water in the dark for 3 hours. The flowers were selected for uniformity in terms of development. The stems were trimmed to equal length (50 to 60 cm) and tagged to allow recording morphological changes associated with individual flowers. The flowers were held during 24 hours (pulsing treatment period) at 25 plus or minus 2 deg C and 60 to 90% RH under continuous cool white fluorescent light at 1.5 KLx. At the end of the treatment, the flowers were transferred to distilled water under daily 10 hours of continuous fluorescent light and at the same laboratory conditions. At the first experiment, the efficiency of 8-hydroxyquinoline (8-HQ) and thiabendazole (TBZ) as germicides was tested in 3 concentrations. In addition, 3 grow
th regulators were applied to keep the green colour and the turgidity of leaves, i.e. gibberellic acid (GA3), 6-benzylaminopurine (6-BA) and their combination. At the second experiment, to extend the vase life by inhibition of ethylene production, the effect of silver nitrate (AgNO3), anionic silver thiosulphate complex (STS) and cobalt chloride (C0CI2) was tested into pulsing solutions in 3 concentrations. The results of the experiments showed that pulsing treatment with distilled water + 0.52 mol/m3 citric acid + 58.43 mol/m3 sucrose + 0.69 mol/m3 8-HQ + 2.9 or 4.4 mol/m3 AgNO3 combined with foliar treatment of 0.058 mol/m3 GA3 improved the foliar quality and extended the flower vase life.