Cut Rose Flowers Research Articles

Utilizing Bacterial Isolates from Leaf Apoplast of Cold-Resistant Plants to Enhance the Post-Harvest Longevity of Cut Rose Flowers

Utilizing Bacterial Isolates from Leaf Apoplast of Cold-Resistant Plants to Enhance the Post-Harvest Longevity of Cut Rose Flowers

The Effect of Different Plant Hormones on the Preservation of Cut Rose Flowers

The Effect of Different Plant Hormones on the Preservation of Cut Rose Flowers

Antimicrobial Effect of Slightly Acidic Electrolyzed (HOCl) Water on Botrytis cinerea of Cut Rose Flowers

Antimicrobial Effect of Slightly Acidic Electrolyzed (HOCl) Water on Botrytis cinerea of Cut Rose Flowers

Supplementary Top LED Lighting Improved Physiological Parameters and the Postharvest Life of Cut Rose Flowers

Supplementary Top LED Lighting Improved Physiological Parameters and the Postharvest Life of Cut Rose Flowers

Yield, Flower Quality, and Photo-Physiological Responses of Cut Rose Flowers Grafted onto Three Different Rootstocks in Summer Season

The thermal stress caused by high temperatures on cut rose flowers grown in greenhouses is a major environmental impact that reduces the yield of growing cut rose flowers during summer. To confirm the resistance of grafted cut rose flowers to high-temperature stress, roses were grown in a greenhouse during the summer season and analyzed for yield, quality, root activity, and photo-physiological characteristics. A morphological change was observed in the stomata of the grafted cut rose flowers, which were larger in size than the scion or rootstocks. As a result of cultivating cut rose flowers by lowering the temperature of the greenhouse through shading in summer, it was confirmed that all of the scions, rootstocks, and grafted cut rose flowers were not in a stressed state by observing the maximal quantum yield of primary photochemistry (FV/FM) values on the chlorophyll-a fluorescence. However, the rate of electron transport flux from the primary acceptor (QA) to the secondary acceptor (QB) per the photosystem II reaction center (ET0/RC) value was found to be significantly higher on grafted cut rose flowers, compared with that of the scions. The efficiencies of the photosynthesis rate, the transpiration rate, and the stomatal conductance were increased when grafted compared with non-grafted. When the root activity was confirmed by the formazan content, it was found that the root activity was improved grafting. Furthermore, when grafted, morphological changes such as flower size and the number of petals on spray roses were also observed. Although there was a difference depending on the type of rootstock, the yield of the grafted cut rose flowers increased by 11–20%, compared with the scion rose. Therefore, grafting cultivation during the summer season with high temperatures is an effective method in terms of photo-physiological response and yield.

Natural Skullcap Extracts Substitute Commercial Preservatives during Summer Export for Cut Rose Flowers

Preservative effect of natural skullcap extract (Scutellaria baicalensis, SC solution) in cut rose flower ‘Fuego’ under simulated summer export conditions was investigated. The t ransport conditions were divided into dry and wet transports. The wet t ransport was t reated with tap water, Floralife 1%, and SC solution 300 mg･L-1. The vase life of cut rose flowers in the wet transport was extended longer than in dry t ransport. It was two days longer in the SC solution, which is similar to the extension effect of commercial preservatives, Floralife. The discoloration was the main symptom o f vase l ife in d ry t ransport. The bent neck and petal wilting reached 60% to 70% in the wet transport regardless of preservatives. These results show that the native skullcap extracts have a positive effect on the vase life extension of cut rose flowers during summer export, thus they could be applied as eco-friendly alternative preservatives.

ClO<sub>2</sub> Dipping Treatment Inhibits Gray Mold on Cut Rose Flowers During Storage

ClO<sub>2</sub> Dipping Treatment Inhibits Gray Mold on Cut Rose Flowers During Storage

Analyses of the Export Environment of Cut Rose Flowers and the Extended Vase Life after Treatment with Chlorine Dioxide

Analyses of the Export Environment of Cut Rose Flowers and the Extended Vase Life after Treatment with Chlorine Dioxide

Response of Cut Rose Flowers to Relative Humidity and Recut During Postharvest Life

Experiments were conducted to evaluate the response of different originated (the same mother plants with different growers from different cities in Ethiopia) cut rose flowers to various relative humidity (RH) and recut (recut and non-recut). Three different experiments (E1, E2 and E3) using three RH (60, 75 and 90%) and three Ethiopian growing areas (Fleur, Liki and Longonot) with 10 replications were designed. Cut rose flowers from three growing area were recut to 5 cm and placed in 60, 75 and 90% RH as a commercial supply chain. Rose flowers without any recut were selected as control. Mean comparison in three experiments revealed that by increasing storage time in cold room, flower vase life significantly decreased. 75% RH produced the highest flower vase life compared to 60 and 90% RHs. However, mean comparisons showed that cut rose flowers originated from Liki growers significantly had the highest vase life compared to others which followed by Longonot and Fleur ones. The results revealed that 5 cm cut the end of flower stem significantly increased flower vase life compared to control. Mean comparison of bacterial populations in commercial supplies of the three experiments, declared the highest amount of bacteria in E1 than the other experiments. Cut rose flowers originated from Liki growers had the highest bacterial populations at the bottom part of the stem compared to the other growers. The results also showed that the end part of stems contain more bacterial agent compared to upper parts.

Improving Vase Life and Keeping Quality of Cut Rose Flowers Using a Chlorine Dioxide and Sucrose Holding Solution

Improving Vase Life and Keeping Quality of Cut Rose Flowers Using a Chlorine Dioxide and Sucrose Holding Solution

Postharvest Management Condition and Contaminant Degree in Handling of Cut Rose Flowers for Export

To improve the practices of the cultivation and agricultural association corporation stages of exported cut rose flowers, we surveyed the management practices of the rose (Rosa hybrida L.) cultivars ‘Beast’ and ‘Cappucino’ for export. We examined the level of bacterial contamination of tools and sorting surfaces used in a production greenhouse and sorting facility for rose export to Japan, and detected more than 300 CFU･mL-1 on scissors, gloves, and table tops. Samples of water containing cut rose stems in storage at the production greenhouse had 2.8 × 105 CFU･mL-1, and samples from the sorting facility storage water containing 1% Chrysal RVB Clear Intensive Solution (Chrysal International, Naarden, The Netherlands) had 4.7 × 105 CFU･mL-1. Although preservatives with TW of 500 mL (Al2O3, pH 4.5) were used, the number of bacteria in export box with 30 stems at agricultural association corporation of Paju-si was 2.7 × 104 CFU･mL-1 before export. As a result, to study the effect of vase life extension on Florallife-Clear 200 (Oasisfloral, Japan), vase l ife of ‘Beast’ on preservation treatment was longer by 3 days than that control. However, the vase life on Magic rose as processing flower of ‘Beast’ was not significantly different between TW and preservatives. The number of bacteria in TW and preserves was 8.1 × 104 and 2.0 × 103 CFU･mL-1 in ‘Beast’ and 9.9 × 104 and 1.0 × 103 CFU･mL-1 in Magic rose, respectively. As a result of investigating the vase life ‘Cappuccino’, vase life of domestic stage was 8 days, but export stage was 12 days. The vase life termination symptoms were 50% for the bent neck and the petal secession in the domestic distribution, respectively, whereas the export treatment was 72.7% for petal secession, 18.2% for bent neck, and 9.1% for gray mold.

Pulsing Preservatives to Prolong Vase Life of Cut Rose Flowers in Bahir Dar, Northwestern Ethiopia

The longevity of cut flowers including cut roses can be however prolonged using different pulsing preservatives where researches in this regard are lacking in the country. Keeping these bottlenecks of the sector in mind, this study was therefore initiated with objective to evaluate the effectiveness of different pulsing preservatives in prolonging vase life of cut rose varieties. The experiment was conducted at Tana Flora PLC in Bahir Dar, Ethiopia. As pulsing preservatives Al2(SO4)3)(250 mg-1), Ca(ClO)2 (66.7 mg-1), STS [Ag (S2O3)2] (0.5 ml-1), Sugar (20 g-1) and distilled water were used. The three rose varieties namely: Upper class, Athena and Moon walk were used. Healthy flower buds having uniform length and harvested early in the morning were put immediately in containers filled with the respective concentration of pulsing preservatives. Flasks with six rose flowers each were placed in pre-cooling room (8-10 OC) for about 2 hours. Finally, treated cuttings were transferred into experimental room with temperature of 22-250C and 75% relative humidity and arranged in Complete Randomized Design (CRD) with three replications. At this time, pulsing preservatives were replaced by distilled water. The analysis of variance revealed that most of parameters were highly significantly influenced by the main as well as interaction effects of pulsing preservative and varieties (P<0.0). Maximum water uptake (7.73 g/flower/day), transpiration loss (7.08 g/flower/day), flower fresh weight (21.77 g/flowers), flower head diameter (7.6 cm), and maximum flower vase life (23 days) were recorded in Athena variety pulsed with STS.

Effects of Some Chemicals on Vase Life of Some Cut Flowers I. Effect of 8-Hydroxyquinoline Sulfate, Silver Nitrate, Silver Nano Particles and Chitosan on Vase Life and Quality of Cut Rose Flowers (Rosa hybrida. Cv. “Black Magic”)

This investigation was carried out during 2015 and 2016 seasons to determine whether the selected chemical agents could be used to improve the postharvest quality of Rosa hybrida L.cv. “Black Magic” cut flowers. Freshly cut flowers were placed in glass cylinders containing 100 ml of preservative solutions [8-hydroxyquinoline sulfate (8-HQS) at 200 ppm, silver nitrate (AgNO3) at 10 ppm, Chitosan at 50, 75 or 100 ppm silver nano-particles (SN) at 5, 10 or 15 ppm, and distilled water as a control treatment].All preservative solutions and the control treatment included sucrose at 20 g/l. Compared to the control, treatments which contained of (AgNO3) or (SN) improved the quality and vase life of the flowers. They were more effective in promoting water uptake, increasing fresh weight of the flower and water balance so that the vase life of cut flowers were extended to 13.67 and 12 days during the first and second seasons, respectively. The results of bacterial count in the vase solution and the Scanning Electron Microscopy (SEM) pictures of the cut base of the stem indicated that (AgNO3) or (SN) strongly reduced bacterial population in both the vase solution and the cut stem base. The results indicated that using (AgNO3) or (SN) combined with 20 g/l sucrose could be used as a commercial cut flower preservative solution for prolonging the vase life and enhancing post-harvest quality of selected rose cut flowers.

EFFECT OF NANO SILVER AND SILVER NITRATE ON VASE LIFE AND KEEPING QUALITY OF CUT ROSE FLOWERS AFTER PERIODS OF COLD STORAGE

EFFECT OF NANO SILVER AND SILVER NITRATE ON VASE LIFE AND KEEPING QUALITY OF CUT ROSE FLOWERS AFTER PERIODS OF COLD STORAGE

Effects of Long-Day Treatment Using Fluorescent Lamps and Supplemental Lighting Using White LEDs on the Yield of Cut Rose Flowers

During arching cultivation of roses in autumn and winter, long-day treatment using fluorescent lamps placed above the base of the plants slightly increased the number of cut flowers and also tended to increase the cut flower length in the first year. To further investigate these effects, the light condition of assimilation shoots was modified by supplemental lighting using white light-emitting diodes (LEDs) placed above the assimilation shoots. Supplemental lighting at two different levels of photosynthetic photon flux density (PPFD), 100 and 250 μmol m−2 s−1, increased the number of cut flowers from the middle portion of the assimilation shoots, and the total number and weight of cut flowers according to the light intensity. Irradiation at 250 μmol m−2 s−1 PPFD also increased the number of cut flowers over 80 cm long and the length, weight and stem diameter of cut flowers over 60 cm long. Long-day treatment using fluorescent lamps did not affect the number of cut flowers in the second year. These results indicate that long-day treatment using fluorescent lamps can effectively increase the yield of cut rose flowers in some years, while supplemental lighting using white LEDs for assimilation shoots is a method of increasing it more strongly.

CALCIUM PROMOTES LONGEVITY AND BUD OPENING IN CUT ROSE FLOWERS

ABSTRACT Calcium applied to cut rose flowers mainly as Ca(NO3)2 (but also as CaCl2) extended longevity and promoted bud opening. The effect was recorded when calcium was applied either alone or together with 2% sucrose (S) and 8-hydroxyquinoline citrate (HQC). Treatments were applied either continuously or as a short-term (20-h) pulse. Longevity extension was observed in the rose cultivars Sonia, Celica, Samantha, and Mercedes. In Ilseta roses, calcium did not extend longevity over that achieved in an HQC + S preservative solution. Mg and K salts had no beneficial effect on the keeping qualities of cut roses. Measurements of 45Ca distribution showed that calcium accumulated in all flower parts, including petals.

Efficiency of Silicon, Nickel and Acetylsalicylic Acid Reduced Senescence and Extended Vase Life of Cut Rose Flowers

Efficiency of Silicon, Nickel and Acetylsalicylic Acid Reduced Senescence and Extended Vase Life of Cut Rose Flowers

Effects of Vase Solution and Air Temperatures and Isothizolinonic Germicides on the Vase Life of Cut Rose Flowers

Effects of Vase Solution and Air Temperatures and Isothizolinonic Germicides on the Vase Life of Cut Rose Flowers

Effects of nanosilver and sucrose on vase life of cut Rose flower (Rosa hybrid cv. ‘Royal’)

In cut flowers increasing of quality and duration of storage and minimizing wastes after harvest is very important. Silver thiosulphate (STS) is one of the materials that in this connection is used, but because of environmental pollutant, its application has been limited. Recent study evaluated the possibility of replacing nanosilver instead of STS. In this study, experimental design was factorial with two factors, including sucrose and several types of chemicals such as nanosilver, hydroxyquinoline citrate (HQC), copper nitrate and STS with three replications that were performed on the cut Rose flower cultivar royal using pulsed method. During the experiment, traits such as vase-life of flower, electrolyte leakage (EL), relative water content (RWC), leaf and flower qualitative traits and percentage of flowers opening were evaluated. Analysis of variance showed that between traits among treatments, there are significant differences. Mean comparisons showed that the use of STS in combination with 8 percent sucrose had the most effect on traits, so that vase-life of cut Rose flowers has increased up to 67.15 days. Application of nanosilver using concentration of 5 ppm in combination with 4 percent sucrose also could, to reach the vase-life of flowers to 67.13 days that it seems to bring effective treatment to increase the vase- life of cut Rose flowers. Use of STS in combination with different concentrations of sucrose and 15 ppm nanosilver with 4 percent sucrose had also a significant difference in maintaining of quality and vase-life of flowers other than chemical treatments. Key words: Sucrose, silver thiosulphate (STS), hydroxyquinoline citrate (HQC), copper nitrate, nanosilver, Rose cultivar royal.

Genotypic Variation in the Postharvest Performance and Ethylene Sensitivity of Cut Rose Flowers

Natural variation in the postharvest quality and longevity of ornamental plants can often be related to differences in their response to ethylene. In the present study, we determined the postharvest performance and ethylene sensitivity of cut flowers from 38 cultivated Hybrid Tea rose genotypes. The vase life of the cultivars varied considerably from 4.5 to 18.8 days at 21 °C. There was also substantial variation in the degree of flower opening among genotypes. Exposure to 1 μL·L−1 ethylene for 24 h at 21 °C reduced the longevity of 27 cultivars by 0.8 to 8.4 days (18% to 47%) by accelerating petal wilting and abscission. Ethylene treatment also significantly reduced rates of flower opening in 17 sensitive cultivars and in six cultivars that showed no ethylene-related reduction in vase life. Five cultivars showed no reduction in vase life or flower opening in response to ethylene exposure. Pre-treating stems with 0.2 mm silver thiosulfate liquid or 0.9 μL·L−1 1-methylcyclopropene (1-MCP) gas for 16 h at 2 °C reduced the deleterious effects of ethylene. The release of 1-MCP from two sachets containing EthylBloc™ into individual shipping boxes also protected flowers against ethylene applied immediately after a 6-d commercial shipment. The duration of protection afforded by the 1-MCP sachet treatment was greatest when flowers were maintained at low temperature.