Inhibition of Ethylene Synthesis and Senescence in Carnation by Ethanol (original) (raw)
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Alcohols and carnation senescence
HortScience, 1992
Continuous treatment with 8% ethanol doubled the vase life of 'White Sim' carnation (Dianthus caryophyllus L.) flowers. Other alcohols, other concentrations of ethanol, or pulse treatments with up to 8% ethanol had little or no effect. Butanol and longer-chain alcohols shortened vase life and caused the flower stem to fold. During their eventual senescence, the petals of ethanol-treated flowers did not inroll; instead, individual petals dried slowly from their tips. Very little ethylene was produced by ethanol-treated flowers, and the normal increase in ACC content and EFE activity was also suppressed. Ethanol treatment also decreased the flowers' sensitivity to exogenous ethylene.
2013
would have never have been completed: .:. Professor J. van Staden; for his constant supervision, invaluable suggestions and excellent advice during the past four years, as well as financial support. •:. My partner Paul; for putting up with me during the time it took me to research and write this thesis. Thank you for you love and encouragement. .:. My parents and sisters; for their love and belief in me, now and always. •:. All my friends, who were always there when I needed them, especially Phills,
Effect of ethanol on the longevity and abscission of bougainvillea flower
2007
The experiment was carried out to study the effect of different concentrations of ethanol on bougainvillea flower vase life and delayed abscission. Young and fresh flowers were harvested from 4-year-old bougainvillea trees randomly. Flower stems (petiole) were placed individually in an open solution containing different concentrations of ethanol immediately after harvesting. The solutions used for treatment were water (control), 2, 4, 8, 10, 20, 30, 40, 50 and 70% ethanol. Positive responses were found in the case of 8 and 10% ethanol after 5 days of treatment. Flower longevity was 2 days longer in 8 and 10% ethanol than in water control and other concentrations of ethanol. Petal wilting and abscission occurred 2 days later than water control. Perianth abscission was later in 8 and 10% ethanol than water control. Percent petal scar (color changing) was later in water control, 2, 4, 8 and 10 than 20, 30, 40, 50 and 70% ethanol The result showed that the flower vase life was significantly affected by ethanol concentrations and longevity was more in 8 and 10% ethanol than water control and other concentrations.
Influence of ethanol on the longevity and delayed senescence of bougainvillea flower
2008
The study was carried out to investigate the effect of ethanol (ET) at different concentrations on longevity and senescence delay in bougainvillea flowers. The treatments were water (control), 2, 4, 8, 10, 20, 30, 40, 50 and 70% ET. Positive response was found in case of 4, 8 and 10% of ET after a certain period of treatment application. Dry weight was higher in lower concentrations of ethanol and lower in higher concentrations. Flower longevity was 2 days longer in 4, 8 and 10% ET than in water control and other concentrations of ethanol. Petal wilting and abscission occurred 2 days later in 4, 8 and 10% ET than in control. Perianth abscission also appeared 2 days later in 4, 8 and 10% ET than in control. However, petal discoloration (color change) was later in control, 2, 4, 8 and 10% than in 20, 30, 40, 50 and 70% ET. The results showed that flower vase life was significantly affected by ethanol concentrations as well as longevity was longer in 4, 8 and 10% ET than in water control and other concentrations.
Ethylene and flower senescence
Plant Growth Regulation, 1992
The end of the relatively short life of carnations held in air is associated with climacteric rises in ethylene production and respiration, and coordinate rises in activity of the enzymes of the ethylene biosynthetic pathway. Carnation sensescence is associated with derepression of specific genes, increased polyribosome activity, and major changes in patterns of protein synthesis. Isotopic competition assays indicate the presence in carnation petals of ethylene binding activity with the expected characteristics of the physiological ethylene receptor. Inhibition of ethylene production and/or ethylene binding (whether in selected varieties, or by treatment with chemicals) results in longer-lived carnations. Examination of other flowers shows that the carnation is not a universal paradigm for flower senescence. The response to ethylene varies widely, and in many species petal wilting occurs without any apparent involvement of ethylene.
Effect of ethanol (2, 4 & 6%) combined with 2.5% sucrose on lisianthus (Eustoma grandiflorum Mariachii. cv. blue) cut flowers was studied. The vase were placed in chambers at 25oC, relative humidity about 70% and 14h photoperiod that was maintained using fluorescent lamps (light intensity of 15 µmol m -2 s -1 ) at the top of the corolla. Data were recorded for vase life, fresh weight, ethylene production rate, solution uptake over time and analyzed statistically. Results revealed that 2% ethanol along with 2.5% sucrose were the most effective on vase life of lisianthus cut flowers. Use of ethanol inhibited ethylene production and increased water uptake
A screening test for the determination of cut flower longevity and ethylene sensitivity of carnation
Horticultural Science, 2017
Strategies to prevent postharvest losses include the use of genotypes that have a longer life. The objective of this study was to develop a screening test for the estimation of cut flower postharvest life and the response to exogenous ethylene of different carnation cultivars at an early stage of plant growth. Ethylene sensitivity and production in different cut flower cultivars was evaluated, and a similar response in the vegetative stage was studied. Also, the possible relationship between the morphological parameters of cuttings and flower postharvest life was studied. Ethylene production of cuttings may be a useful tool for estimating ethylene production of cut flowers. There is a strong relationship between cut flower vase life and the root length of cuttings, as well as cut flower ethylene sensitivity and the number of internodes the cuttings have. Applications of exogenous ethylene to cutting cultivars have an effect on the growth parameters of the cuttings, but the response ...
1997
Senescence and stresses have been documented to promote ethylene synthesis in ethylene-sensitive flower such as carnations. Thus the inhibition of ethylene evolution might lead to activation of other metabolic reactions. Present experiments were undertaken with cut at bud stage spray-carnation (D. caryophyllus f. spray, Hort.) flowers, cv. Regina and cv. Naslada. Tested cultivars are a new breeding result at Institute of Floriculture, Sofia. After harvest treatments with AOA and sucrose were applied using AOA as senescence retarding agent. The goal was to trace how proline content and α-amylase were affected when ethylene synthesis was inhibited. Considerable extension of vase-life (about 128% over the control) and bud opening to fully open flowers were established in response to AOA and AOA+sucrose treatments. A stimulation α-amylase activity was noticed at the beginning of post-harvest petal growth. In response to AOA treatment the activity of α-amylase and the content of free proline remained on a lower level which indicated less exhibited stress reaction and this was associated with a retardation of senescence processes. The studied metabolic events showed a specificity of cultivar behaviour.
2012
METHODS AND MATERIALS 2.1 PLANT MATERIAL 59 2.2 DETERMINING CHANGES IN THE APPEARANCE OF SENESCING FLOWERS 59 2.3 TREATMENTS USED IN THE EXAMINATION OF FLOWER LONGEVITY 60 2.3.1 Test solutions 60 2.4 THE EFFECT OF WATER STRESS 62 2.5 MEASUREMENT OF ETHYLENE SENSITIVITY 2.6 DETERMINATION OF THE STARCH CONCENTRATION IN CARNATION PETALS 63 2.7 DETERMINATION OF THE SUGAR CONTENT IN CARNATION PETALS 2.8 DETERMINATION OF THE CYTOKININ ACTIVITY IN CARNATION PETALS 65 2.8.1 Cytokinin extraction and purification 2.8.2 Determining cytokinin activity 2.9 DETERMINATION OF ETHYLENE PRODUCTION