the management of postharvest B. cinerea infection and postharvest vase life of bigleaf hydrangea cut flowers. The fungicides and biorational products were also assessed for phytotoxicity and application residue on cut flowers. The results of this
Ravi Bika, Cristi Palmer, Lisa Alexander, and Fulya Baysal-Gurel
Cristian E. Loyola, John M. Dole, and Rebecca Dunning
, timing, vase life, weak stems, and zinnia meltdown ( Tables 8 – 10 ). Hydration was a problem for the postharvest of blue flossflower (10.0%), delphinium (11.1%), hydrangea (28.3%), viburnum (16.7%), and yarrow (20%). None of these species hydrate easily
Iftikhar Ahmad, Muhammad B. Rafiq, John M. Dole, Bilal Abdullah, and Kinza Habib
containing 300 mL of vase solution. Stem ends of the flowers pulsed with sucrose solution were rinsed with tap water to remove excessive sugar attached with the stems to reduce microbial contamination, before placing in jars. Stems were kept in a vase life
Typically, wilting symptoms are associated with termination of vase life of most cut flowers (8), suggesting that water relations are of importance, especially when it concerns an advanced phase of vase life.
Michael S. Reid, Richard Y. Evans, Linda L. Dodge, and Yoram Mor
The presence of very low concentrations of ethylene had dramatic effects on the opening of cut flowers of rose (Rosa hybrida L.). Depending on cultivar, the rate of opening was unaffected (e.g., ‘Gold Rush’), accelerated (e.g., ‘Sterling Silver’), or inhibited (e.g., ‘Lovely Girl’). The K m for the inhibition of opening of ‘Lovely Girl’ by ethylene was 4 ppb. Flowers of some cultivars (e.g., ‘Royalty’) had an abnormal shape when opened in the presence of ethylene. The effects of exogenous ethylene could be overcome by pretreatment of the flowers with 0.5 μmol silver thiosulfate per stem. No phytotoxicity was observed in flowers treated with 2 μmol per stem. Examination of the kinetics of the ethylene/Ag+ interaction in inhibition of opening of ‘Lovely Girl’ flowers indicated that the Ag+/ethylene interaction was competitive.
N. Gorin, G. Staby, W. Klop, N. Tippet, and D. L. Leussing Jr.
Various silver containing solutions were evaluated for their effectiveness in extending the life of cut carnations (Dianthus caryophyllus, L. ‘Improved White Sim’) by simple chemical tests of the solutions. Effective solutions formed an immediate white or yellow precipitate (AgI) when 3.0 ml of the solution reacted with 0.15 ml of 2.0 m KI solution, whereas no precipitate formed when reacted with 0.15 ml of 2.0 m NaCI solution. When no precipitate formed with KI, there was insufficient silver in the solution to extend flower life, and hence, no silver was detected in a combined stem and leaf sample or in the flower head (consisting of receptacle, pistil, bracts, calyx and petals). A precipitate forming with both KI and NaCI indicated that the solution contained silver but in the wrong formulation to extend life. Flowers treated with this solution had silver in the combined stems and leaves, but practically none in heads. When solutions were effective, more silver was detected in heads than in the stems and leaves combined.
Zhen Shu, Yimin Shi, Hongmei Qian, Yiwei Tao, and Dongqin Tang
were sensitive to ethylene. van Meeteren et al. (1995) reported the relationships between carbohydrate and vase life of Freesia flowers. Very little is known, however, about the respiration characteristics and the physiological metabolisms during
John M. Dole, Frankie L. Fanelli, William C. Fonteno, Beth Harden, and Sylvia M. Blankenship
Optimum postharvest handling procedures were determined for Dahlia `Karma Thalia', Lupinusmutabilis ssp. cruickshankii`Sunrise', Papaver nudicaule `Temptress', and Rudbeckia`Indian Summer.' Dahlia harvested fully open had a vase life of 7–10 days in deionized (DI) water that was increased by 1.5–2 days using commercial holding solutions (Chrysal Professional 2 Processing Solution or Floralife Professional). Neither floral foam nor 0.1–1.0 ppm ethylene had any effect on vase life. One week of cold storage at 1 °C reduced vase life up to 2 days. The longest vase life, 12–13 days, was obtained when floral buds, showing a minimum of 50% color, were harvested at the breaking stage (one petal open) and placed in 2% or 4% sucrose or a commercial holding solution. Lupinus flowers held in DI water lasted 8–12 days; 1 week cold storage at 1 °C reduced vase life by 3 days. Florets and buds abscised or failed to open when exposed to ethylene; STS pretreatment prevented the effects of ethylene. Commercial holding solutions increased Papaver vase life to 7–8 days from 5.5 days for stems held in DI water. While stems could be cold stored for 1 week at 1 °C with no decrease in vase life, 2 weeks of cold storage reduced vase life. Flowers were not affected by foam or ethylene. Rudbeckia had a vase life of 27–37 days and no treatments extended vase life. Stems could be stored at 2 °C for up to 2 weeks and were not ethylene sensitive. Floral foam reduced the vase life over 50%, but still resulted in a 13-day vase life.
Will Healy and David Lang
Vase life of Alstroemeria hybrida ‘Regina’ was longest in inflorescences with secondary and tertiary florets. The presence of additional florets on a cyme decreased the vase life of the primary floret. Maximum flower opening and normal coloration occurred when the primary florets were harvested at the “rolled petal stage”. Cutting Alstroemeria stems above the blanched portion of the stem before placement in water increased water uptake and vase life. When secondary florets were present, leaf removal did not decrease vase life.
Peitao Lü, Xinmin Huang, Hongmei Li, Jiping Liu, Shenggen He, Daryl C. Joyce, and Zhaoqi Zhang
Termination of vase life for cut flowers is characterized by wilting associated with an imbalance developing between water uptake through xylem conduits in stems and water loss through stomata and other structures on leaves and other organs. To