20 results on '"RABIZA-ŚWIDER, Julita"'
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2. The effect of cycloheximide and growth regulators on the senescence of cut leaves in Hosta sp. and Zantedeschia aethiopica
- Author
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Skutnik Ewa, Rabiza-Świder Julita, Jędrzejuk Agata, and Musiał Diana
- Subjects
cut foliage ,cysteine protease activity ,free amino acids ,free proline ,proteolytic activity ,vase life ,Plant culture ,SB1-1110 - Abstract
The leaves of Zantedeschia and Hosta are used as florist greens in different floral arrangements. The most efficient postharvest treatment for cut foliage is the use of growth regulators, which prolong their vase life by delaying degradative changes occurring in leaves, especially proteolysis. Cycloheximide (CHI) is one of the protein synthesis inhibitors, blocking the enzymes responsible for decreasing membrane integrity, a phenomenon hastening senescence. The aim of this experiment was to evaluate the effects of CHI and benzyladenine (BA) or gibberellic acid (GA3) on the longevity of cut foliage in hosta (Hosta sp.) cultivars and Ethiopian calla (Zantedeschia aethiopica) and to follow the changes in certain proteolytic processes occurring during senescence. Generally, 24 h conditioning with cycloheximide shortened the longevity of cut calla leaves while having no effect on hosta vase life. In ageing leaves of ‘Minima Glauca’ hosta and calla, the total proteolytic activity increased, including that of cysteine protease. Due to the application of BA or GA3 in hosta and calla, respectively, this activity was limited. On the contrary, the use of CHI either did not affect the activity of cysteine protease or increased it several-fold relative to the control, in hosta and calla, respectively. Leaves treated with growth regulators had many more soluble proteins and fewer free amino acids, including free proline, than leaves from other treatments. The highest free proline level was determined in calla leaves conditioned with CHI, where it increased 18-fold relative to the initial level.
- Published
- 2015
- Full Text
- View/download PDF
3. Effect of postharvest treatments on the longevity of cut inflorescences of ‘Rialto’ oriental lily
- Author
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Rabiza-Świder Julita, Skutnik Ewa, Jędrzejuk Agata, and Ratuszek Marlena
- Subjects
chlorophyll ,free proline ,gibberellic acid ,preservative ,senescence ,soluble proteins ,vase life ,Plant culture ,SB1-1110 - Abstract
Cut lily flowers are very popular but their longevity is not satisfactory. The quality of cut lily flowers is determined by two factors: the longevity of the flowers and the general appearance of the entire cut stem during its vase life. The aim of this work was to evaluate the effects of gibberellic acid (GA3), standard preservative (8HQC and 2% sucrose) and commercial preservatives Chrysal Professional 2 and Chrysal sachet as well as Floralife 200 and Floralife 300 on the quality of ‘Rialto’ cut oriental lily, a white blooming cultivar very popular on the Polish market. The contents of reducing sugars, soluble proteins, free amino acids and free proline were also determined in the senescing flowers. As a major problem in the postharvest handling of lilies is leaf yellowing, the effects of postharvest treatments on the quality of leaves and their chlorophyll contents were also studied. Conditioning (24 h) with GA3 (500 mg d.m.−3) immediately after harvest delayed chlorophyll loss in leaves. When combined with the standard preservative and commercial preparations Chrysal Professional 2 and Chrysal sachet as well as Floralife 200 and Floralife 300, GA3 prolonged flower vase life. The most effective method was using GA3 and Floralife products, which prolonged the vase life of flowers to 23 days, 43% longer relative to the untreated flowers, and maintained the decorative value of the leaves (53 days). During the senescence of flowers held in water, the contents of reducing sugars, free amino acids and proline increased. However, the holding solutions modified changes in these parameters relative to the control.
- Published
- 2015
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4. Low temperature forcing reduces oxidative stress in lilac flowers
- Author
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Jędrzejuk, Agata, Łukaszewska, Aleksandra, Rabiza-Świder, Julita, and Skutnik, Ewa
- Published
- 2016
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5. Flowering conditions affect flower longevity in Syringa vulgaris and cause changes in protein content, protease activity and expression of a KDEL-CysEP gene
- Author
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Jędrzejuk, Agata, Rabiza-Świder, Julita, Skutnik, Ewa, and Serek, Margrethe
- Published
- 2016
- Full Text
- View/download PDF
6. Proteolysis and expression of the cysteine protease gene in senescing cut leaves of Hosta ‘Undulata Erromena’ and Zantedeschia aethiopica Spr. treated with BA or GA3
- Author
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Rabiza-Świder, Julita, Rybka, Zbigniew, Skutnik, Ewa, and Łukaszewska, Aleksandra
- Published
- 2003
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- View/download PDF
7. Effect of preservatives on senescence of cut daffodil (Narcissus L.) flowers.
- Author
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Rabiza-Świder, Julita, Skutnik, Ewa, Jędrzejuk, Agata, and Sochacki, Dariusz
- Subjects
DAFFODILS ,FLOWERS ,SUCROSE ,CELL anatomy ,SUGAR ,LONGEVITY - Abstract
We report on the effect of holding solutions containing 8-hydroxychinoline (8-HQC) and sucrose (2-10%) on senescence parameters in three daffodil cultivars. Xylem blockages obstructing water uptake in many flowers did not develop in cut daffodil scapes. The use of preservatives improved hydration of perianth but did not result in longer vase life. Only with 'Golden Harvest' was the corona longevity prolonged following application of the biocide with 6% and 10% sucrose. Changes in the structure of epidermis cells occurred after harvest: corona epidermis was more durable than that of perianth, which may account for shorter longevity of the latter element. The use of 8-HQC with 2% sucrose positively affected epidermis structure in the corona and perianth. Individual floral structures differed in their ability to accumulate sugars delivered in the preservative and translocated within the flower. Generally, supplementing flowers with exogenous sucrose results in ovary growth and not in an increased perianth longevity. However, a higher sugar content was found not only in the ovary but also in the corona of flowers held in the preservatives and this may explain a longer longevity of that floral structure as compared to perianth. [ABSTRACT FROM AUTHOR]
- Published
- 2020
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8. The Effect of a Sugar-Containing Preservative on Senescence-Related Processes in Cut Clematis Flowers.
- Author
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RABIZA-ŚWIDER, Julita, SKUTNIK, Ewa, and JĘDRZEJUK, Agata
- Subjects
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CLEMATIS , *CUT flowers , *PROTEOLYTIC enzymes , *CYSTEINE proteinases , *PROLINE - Abstract
Clematis is a new species grown as cut flower, whose vase life is variable and cultivar-depended. Little is known about senescence of its cut flowers and their response to flower preservatives. The aim of the study was to evaluate the effect of a preservative (standard preservative SP, 8-hydroxyquinoline citrate plus sucrose) or a biocide solution (8-HQC) on certain senescence-related processes in cut clematis flowers. Analyses were done immediately after harvest and at the end of the vase life when control flowers held in water were wilting. A possible relationship between senescence parameters and the vase life of clematis taxa was also sought. As in most cut flowers, the contents of reducing sugars and soluble proteins in clematis petals decreased during the vase life while the proteolytic activity, including that of the cysteine protease, increased and was accompanied by accumulation of free proline and ammonium. Cut flower longevity in cultivars under study was not associated with the initial levels of reducing sugars, soluble proteins or free proline. Neither was the initial proteolytic activity or its increase during vase life related to the vase life itself: cultivars having comparable life spans differed dramatically in the initial and final proteolytic activities. Both solutions containing 8-HQC significantly affected the senescence-related processes and flowers held in them had more soluble proteins and lower proteolytic activity (total, and that of the cysteine protease) than control flowers held in water. Approximately a twofold increase in reducing sugars was observed in flowers held in SP relative to those held in water or in 8-HQC while the accumulation of free proline and ammonium was limited in their petals. This suggests a regulating action of exogenous sugar in senescence of clematis flowers. However, the delay of senescence produced by the preservative was not always associated with a longer vase life in any given cultivar. Further studies are needed to elucidate the role of sugar in clematis flower senescence. [ABSTRACT FROM AUTHOR]
- Published
- 2019
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9. Growing conditions and preservatives affect longevity, soluble protein, H2O2 and MDA contents, activity of antioxidant enzymes and DNA degradation in cut lilacs.
- Author
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Jędrzejuk, Agata, Rabiza-Świder, Julita, Skutnik, Ewa, and Łukaszewska, Aleksandra
- Subjects
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LILACS , *ORNAMENTAL shrubs , *PLANT longevity , *PLANT enzymes , *ANTIOXIDANTS , *PLANT genetics - Abstract
Common lilac ( Syringa vulgaris L.) is a popular ornamental shrub which under natural conditions of the temperate zone blooms for ca three weeks in May. Forcing procedures may extend the flowering period to 6 months in autumn and winter. Temperatures required to begin the forcing cycle range from 37 °C in November to 16 °C in March. Forcing lilac at 15 °C in November is also effective but longer than in the standard method, used by most growers. This study compared vase life and certain senescence-related processes in cut flowers of common lilac harvested from shrubs flowering under different conditions, i.e. outdoors under ambient temperature, forced in a greenhouse under 37 °C (the standard method) or 15 °C (the alternative method), and held in water or two vase solutions containing either nanosilver (NS) or 8-hydroxiquinoline citrate (8-HQC) as biocides and supplemented with 2% sucrose. The highest influence on vase life of cut lilacs had growing conditions. The vase life of cut lilacs obtained by the alternative forcing method – regardless of a holding solution – was significantly higher than those obtained by the standard forcing or blooming naturally. The highest H 2 O 2 content and proteolytic activity were usually observed in flowers collected from stems held in water. MDA content varied depending on flowering conditions and holding solutions. Its relatively low content was observed in the alternatively forced lilacs held in both preservatives which also prolonged the vase life relative to water, decreased the H 2 O 2 content and delayed nuclei degradation in petals. The activity of chosen antioxidant enzymes varied depending on the flowering conditions and generally remained unaffected by the preservatives. The effects of nanosilver with sucrose on cut lilac senescence were comparable to the action of the standard preservative containing 8-HQC, therefore this solution may also be recommended as an efficient preservative delaying senescence and prolonging vase life of cut lilacs. [ABSTRACT FROM AUTHOR]
- Published
- 2018
- Full Text
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10. The effect of preservatives on water balance in cut clematis flowers.
- Author
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Rabiza-Świder, Julita, Skutnik, Ewa, and Jędrzejuk, Agata
- Subjects
HYDROXYQUINOLINE ,PLANT transpiration - Abstract
A positive water balance is crucial for longevity of cut shoots. When water loss by transpiration exceeds water uptake by cut flowers, wilting symptoms appear. Clematis is a very attractive plant which can be used as a cut flower provided that suitable cultivars are chosen. The vase life of four cultivars tested ranged between 6.7 days and 9.0 days and the standard preservative – 200 mg·dm−38-hydroxyquinoline citrate (8HQC) plus 2% sucrose – prolonged it significantly in two cultivars, while 8HQC alone was efficient in only one. The preservatives delayed reduction in fresh weight. An enhancement of water uptake by the preservatives resulted in prolonged vase life of flowers in two cultivars. However, the effect of preservatives on transpiration was not related to longevity. In addition, longevity did not depend on the xylem vessel size: the cultivar with the longest vase life had the lowest average xylem vessel diameter while the cultivar with the largest vessels had an intermediate vase life. Preservatives did not always affect the number of blockages in xylem appearing during vase life. Generally, the effects of preservatives on the elements of water balance in cut shoots of clematis were not directly related to the postharvest longevity. [ABSTRACT FROM AUTHOR]
- Published
- 2017
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11. Symptoms of programmed cell death in intact and cut flowers of clematis and the effect of a standard preservative on petal senescence in two cultivars differing in flower longevity.
- Author
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Rabiza-Świder, Julita, Rochala, Julia, Jędrzejuk, Agata, Skutnik, Ewa, and Łukaszewska, Aleksandra
- Subjects
- *
CUT flowers , *APOPTOSIS , *SYMPTOMS , *CLEMATIS , *CELLULAR aging , *CULTIVARS , *LONGEVITY - Abstract
Clematis is visually a very attractive plant which can be used for cut flowers, provided that proper cultivars are chosen. In this study, the phenomenon of programmed cell death (PCD) was compared in petals of clematis blooming on mother plants in the open field and in cut flowers, in two cultivars with different flower longevity. The dynamics of PCD in petals of field grown plants in the two cultivars were different. In the long flower longevity cultivar the first symptoms of PCD were observed in the flower bud, and in the open flower the process was already advanced. On the other hand, PCD in petals of the short flower longevity cultivar was advanced already in the flower bud. In both cultivars the nuclear degradation started early, but the dynamics were different: in the long flower longevity cultivar 18.6% of the nuclei were degraded in the open flower vs . 68.3% of degraded nuclei already in the flower bud in the short flower longevity cultivar. Senescence processes are intensified in cut flowers. In cut flowers of both cultivars kept in water the process of DNA degradation was much faster than in flowers growing on mother plants. It could be slowed down by the addition of preservatives. The standard preservative of 8-hydroxyquinoline citrate (8-HQC) 200 mg L −1 with 2% sucrose prolonged the vase life of cut flowers of both cultivars as compared to water, but organelle degradation in petals was delayed only in the shorter-lived cultivar. [ABSTRACT FROM AUTHOR]
- Published
- 2016
- Full Text
- View/download PDF
12. Some factors affecting longevity of cut lilacs.
- Author
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Jędrzejuk, Agata, Rabiza-Świder, Julita, Skutnik, Ewa, and Łukaszewska, Aleksandra
- Subjects
- *
LILACS , *CUT flowers , *VASES , *INFLORESCENCES , *XYLEM - Abstract
Short vase life of cut lilac stems limits its commercial potential. Rapid wilting of cut lilac inflorescences is probably caused by blockage of water transport in stems. The purpose of this study was to recognize the nature of the occlusions blocking xylem vessels in cut stems of common lilac and to identify a relationship, if any, between the type of a holding solution, xylem blockages and vase life of lilacs flowering under different environmental conditions. The stems of the white flowering cultivar “Mme Florent Stepman” were harvested in Nov/Dec from shrubs forced from the beginning of November by a standard procedure involving treatment with 37 °C, in January from shrubs forced from the beginning of November under 15 °C, and in May from control shrubs, i.e., flowering naturally in the field. Cut stems were placed in distilled water, 8-HQC, a standard preservative composed of 8-HQC + 2% sucrose, nanosilver and nanosilver + 2% sucrose. Tyloses were observed in stem xylem vessels while practically no microorganisms were detectable. The incidence of blockage formation in the stems depended on the flowering date and the biocide used. The longest vase life was observed in January with 8-HQC or 8-HQC + S, but in all flowering periods the least xylem blockages were formed when NS was used as the biocide. Therefore, formation of tyloses does not appear to be directly related to the postharvest life of lilac and its vase life can be extended by standard florists’ preservatives irrespective of their effect of the xylem physical obstructions. [ABSTRACT FROM AUTHOR]
- Published
- 2016
- Full Text
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13. OCCURRENCE OF BLOCKAGE IN CUT STEMS OF Clematis L.
- Author
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Jędrzejuk, Agata, Rochala, Julia, and Rabiza-Świder, Julita
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CUT flowers ,ABSORPTION of water in plants ,CLEMATIS ,TYLOSES ,XYLEM ,SUCROSE ,POLYSACCHARIDES - Abstract
Copyright of Acta Agrobotanica is the property of Polish Botanical Society / Polskie Towarzystwo Botaniczne and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
- Published
- 2013
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14. Identification of Xylem Occlusions Occurring in Cut Clematis (Clematis L., fam. Ranunculaceae Juss.) Stems during Their Vase Life.
- Author
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Jedrzejuk, Agata, Rochala, Julia, Zakrzewski, Jacek, and Rabiza-Świder, Julita
- Subjects
XYLEM ,CLEMATIS ,RANUNCULACEAE ,PLANT stems ,CULTIVARS ,ORNAMENTAL plants ,PLANT genetics - Published
- 2012
- Full Text
- View/download PDF
15. Proteolysis and expression of the cysteine protease gene in senescing cut leaves of Hosta ‘Undulata Erromena’ and Zantedeschia aethiopica Spr. treated with BA or GA3.
- Author
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Rabiza-Świder, Julita, Rybka, Zbigniew, Skutnik, Ewa, and Łukaszewska, Aleksandra
- Abstract
Treatments with BA or GA
3 are known to extend the foliage display life of Hosta ‘Undulata Erromena’ and Zantedeschia aethiopica Spr., respectively. The effects of a 24hrs pulse conditioning with BA or GA3 on the protein content, proteolytic activity and the expression of the cysteine protease gene were studied in senescing cut leaves of both species. A decrease in the soluble protein content in the untreated leaves was accompanied by an increased total proteolytic activity and the activity of the cysteine protease. The BA treatment in Hosta prevented such increases thereby preventing total protein loss. In Z. aethiopica, the GA3 treatment delayed protein degradation but to a lesser extent than the BA treament of H. ‘Undulata Erromena’ leaves. No expression of the cysteine protease gene was observed in the freshly cut leaves of both species. The presence of the gene transcript was detectable in the senescing leaves of both species kept in water where significant increase in the cysteine protease activity was observed. No increase in the level of the cysteine protease mRNA was detected in the BA - conditioned leaves of Hosta but a slight increase in the transcript level was observed in Z. aethiopica regardless of whether the leaves were conditioned with GA3 or were kept in water. Different reaction of the two species for two plant growth regulators inhibiting senescence suggest different mechanism of this process. [ABSTRACT FROM AUTHOR]- Published
- 2003
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16. Effects of Postharvest Treatments with Nanosilver on Senescence of Cut Lisianthus (Eustoma grandiflorum (Raf.) Shinn.) Flowers.
- Author
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Skutnik, Ewa, Łukaszewska, Aleksandra, Rabiza-Świder, Julita, Meir, Shimon, and Philosoph-Hadas, Sonia
- Subjects
FLOWERS ,CUT flowers ,HYDROGEN peroxide ,TREATMENT effectiveness - Abstract
Lisianthus is among the most popular cut flowers. Regarding the postharvest losses, these experiments were designed to compare the effects of a nanosilver (NS) based preservative to the standard preservative containing 8-hydroxyquinoline citrate (8-HQC) and sucrose (S). Additionally, the effect of 24 h conditioning in the NS solution on the postharvest longevity and the general condition of lisianthus (Eustoma grandiflorum 'Mariachi Blue') was tested. The vase life of flowers on conditioned and non-conditioned stems was extended by the preservatives, more so by NS + S than by 8-HQC + S (44–54% versus 13–23%). Conditioning had no detectable effect on longevity. Daily water uptake showed alternative peaks and drops, with a general tendency of the uptake rate to decrease over time. The highest uptake intensity and the highest transpiration rate were in stems in the NS + S solution while the lowest was in 8-HQC + S. Conditioning negatively affected the average fresh weight of the flowering stems in all holding solutions with stems in preservatives being heavier than those in water. Preservatives did not induce accumulation of the total soluble or reducing sugars in petals; such accumulation was promoted by conditioning, but only in the upper flowers. The free proline content increased in senescing lower flowers on non-conditioned stems; conditioning limited this increase in flowers in preservatives. In the upper flowers, free proline increased in both water controls while the preservatives and conditioning generally reduced the proline contents below the initial level. Conditioning lowered the hydrogen peroxide contents in senescing lower flowers, relative to the initial level and the non-conditioned stems. The catalase activity kept dropping during the vase life in both the lower and upper flowers, in conditioned and non-conditioned stems, with the exception of flowers from water where the activity remained the highest from all three treatments. It appears that the NS preservative with sucrose improves the overall condition of lisianthus flowers and extends their vase life. [ABSTRACT FROM AUTHOR]
- Published
- 2021
- Full Text
- View/download PDF
17. The Effect of the Long-Term Cold Storage and Preservatives on Senescence of Cut Herbaceous Peony Flowers.
- Author
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Skutnik, Ewa, Rabiza-Świder, Julita, Jędrzejuk, Agata, and Łukaszewska, Aleksandra
- Subjects
- *
COLD storage , *FLOWERS , *FARM produce warehouses , *CUT flowers , *HYDROGEN peroxide - Abstract
Recently peonies have become very popular cut flowers. As peony flowering period is short, long term cold storage could assure its prolonged supply and make long distance transport feasible. The effect of dry cold storage, of 8-hydroxyquinoline and nanosilver preservatives on the peony keeping qualities were tested on the most popular cultivar 'Sarah Bernhardt'. The 12 week storage (0–1 °C) shortened flower longevity by 20%, to 8 days and no vascular blockages in the shoots were observed. However, the presence of callose, not considered as a blocking factor, was evident. The sucrose-containing preservatives with either 8-hydroxyquinoline or nanosilver did not extend the flower longevity but they increased flower diameters in both fresh and stored material. Generally, the soluble total and reducing sugars increased in senescing flowers in both non-stored and stored flowers, and they were lower after storage. The free proline increased ca. 20-times during cold storage and at the end of the vase life it remained generally higher in the stored than in fresh flowers. The level of hydrogen peroxide dropped after 12 weeks storage and its contents at the end of the vase life differed depending on the holding solution. Generally it was lower after storage. Storage increased the catalase activity which remained on higher levels in stored flowers from all holding solutions as compared to freshly cut flowers. A five-fold reduction in the peroxidase activity occurred during storage but its activities at the end of the vase life were similar in stored and non-stored flowers. The effects of nanosilver and 8-hydroxyquinoline were similar. [ABSTRACT FROM AUTHOR]
- Published
- 2020
- Full Text
- View/download PDF
18. Postharvest Treatments Improve Quality of Cut Peony Flowers.
- Author
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Rabiza-Świder, Julita, Skutnik, Ewa, Jędrzejuk, Agata, and Łukaszewska, Aleksandra
- Subjects
- *
CUT flowers , *ORNAMENTAL plants , *FLOWERING of plants , *SUCROSE , *AMINO acids , *LONGEVITY - Abstract
Peony is one of the most important ornamental plants in the international flower market, but has a relatively short vase life in water. This study tested the effects of 8-hydroxyquinoline citrate (8-HQC) and nanosilver (NS) in combination with sucrose, as well as two commercial preservatives, on the longevity and some physiological and biochemical aspects of senescence of cut flowers of 14 cultivars. Responses varied both by cultivar and treatment. The preservatives extended the vase life in only five cultivars; however, in nine cultivars, preservatives increased the flower diameter and improved the general flower appearance. Blockages in xylem vessels started to appear soon after harvest. Both NS and 8-HQC with sucrose prevented tylose formation, while bacterial blockages were reduced only by the NS solution. Reduction in stem blockages did not translate into better water balance or flower longevity. The highest carbohydrate accumulation in petals was observed in the NS solution. Preservatives mitigated the rise in free amino acids, including free proline. They did not prevent an increase in H2O2 content but flowers in preservatives generally had higher catalase activity than in the control. As solutions with NS produced comparable or even better results than 8-HQC, we recommend the latter as a component of a preservative for cut peony flowers. However, cultivar-specific responses indicate that postharvest treatments must be individually tailored to each cultivar. [ABSTRACT FROM AUTHOR]
- Published
- 2020
- Full Text
- View/download PDF
19. Nanosilver and sucrose delay the senescence of cut snapdragon flowers.
- Author
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Rabiza-Świder, Julita, Skutnik, Ewa, Jędrzejuk, Agata, and Rochala-Wojciechowska, Julia
- Subjects
- *
CUT flowers , *AGING in plants , *LONGEVITY , *ELECTRIC conductivity , *SUCROSE , *HYDROGEN peroxide - Abstract
• A combination of nanosilver with sucrose extends the vase life of snapdragon flowers. • It prevents tylose formation but not the blockages caused by bacteria. • It increases the activities of antioxidative enzymes. • It delays the nuclei and epidermis degradation. • NS itself limits increases in the EC and pH of the cell sap. Snapdragon (Antirrhinum majus L.) is one of the most important annuals grown for cut flowers, but its vase life in water is relatively short. In this study, the effects of nanosilver (NS) on the vase life of cut snapdragon and effects on physiology, biochemical and morphology levels were investigated. Xylem vessel blockages started to appear soon after harvest. NS prevented tylose formation, but not the blockages caused by bacteria. Cut flowers treated with 1 mg L−1 NS with 2 % sucrose had a longer vase life than those held in water or in NS alone, and improved flower opening, coloration and higher relative water content of flowers in the lower (older) part of the spike. Carbohydrate accumulated in flowers in the NS solution. NS limited increased electric conductivity, and with sucrose decreased the pH of cell sap. NS also limited the increase in the malondialdehyde content, especially in the upper (younger) part of spikes where also the hydrogen peroxide content was much lower than in flowers from the lower spike parts. The activities of antioxidative enzymes were higher in the NS-treated flowers, especially when the NS solution was supplemented with sucrose, and the nuclei and epidermis degradation was delayed. It is evident that the presence of NS in the holding solution, especially when supplemented with sucrose, delays and reduces the severity of all senescence symptoms, thereby extending the useful vase life of snapdragon. [ABSTRACT FROM AUTHOR]
- Published
- 2020
- Full Text
- View/download PDF
20. Identification of xylem occlusions occurring in cut clematis (Clematis L., fam. Ranunculaceae Juss.) stems during their vase life.
- Author
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Jedrzejuk A, Rochala J, Zakrzewski J, and Rabiza-Świder J
- Subjects
- Microscopy, Electron, Clematis metabolism, Plant Stems metabolism, Xylem metabolism
- Abstract
During the vase life of cut stems obstruction of xylem vessels occurs due to microbial growth, formation of tyloses, deposition of materials in the lumen of xylem vessels and the presence of air emboli in the vascular system. Such obstructions may restrict water uptake and its transport towards upwards thus lowering their ornamental value and longevity of cut flowers. Clematis is a very attractive plant material which may be used as cut flower in floral compositions. Nothing is known about the histochemical or cytological nature of xylem blockages occurring in cut stems of this plant. This study shows that in clematis, tyloses are the main source of occlusions, although bacteria and some amorphic substances may also appear inside the vessels. A preservative composed of 200 mg dm(-3) 8-HQC (8-hydroxyquinolin citrate) and 2% sucrose arrested bacterial development and the growth of tyloses. This information can be helpful in the development of new treatments to improve keeping qualities of cut clematis stems.
- Published
- 2012
- Full Text
- View/download PDF
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