Vase treatments containing gibberellic acid do not increase longevity of cut Grevillea 'Sylvia' inflorescences

Setyadjit, ␣; Irving, Donald E.; Joyce, Daryl C.; Simons, D. H.

doi:10.1071/ea04127

Cited by 6 publications

(3 citation statements)

References 23 publications

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“…Saks et al (1992) 97 showed that exogenous application of gibberellic acid delayed the senescence of cut carnation flowers with reduced ethylene production. Recently, Setyadjit et al (2006) 98 treated an ethylene-sensitive flower Grevillea 'Sylvia' and this treatment did not enhance the longevity of inflorescences and ACC level. At higher level gibberellic acid concentrations enhanced flower abscission rather than senescence.…”

Section: Hormonal Regulation Of Flower/petal Senescencementioning

confidence: 98%

Integrated Signaling in Flower Senescence

Tripathi

Tuteja

2007

Plant Signaling & Behavior

106

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Flower senescence is the terminal phase of developmental processes that lead to the death of flower, which include, flower wilting, shedding of flower parts and fading of blossoms. Since it is a rapid process as compared to the senescence of other parts of the plant it therefore provides excellent model system for the study of senescence. During flower senescence, developmental and environmental stimuli enhance the upregulation of catabolic processes causing breakdown and remobilization of cellular constituents. Ethylene is well known to play regulatory role in ethylene-sensitive flowers while in ethylene-insensitive flowers abscisic acid (ABA) is thought to be primary regulator. Subsequent to perception of flower senescence signal, death of petals is accompanied by the loss of membrane permeability, increase in oxidative and decreased level of protective enzymes. The last stages of senescence involve the loss of of nucleic acids (DNA and RNA), proteins and organelles, which is achieved by activation of several nucleases, proteases and wall modifiers. Environmental stimuli such as pollination, drought and other stresses also affect senescence by hormonal imbalance. In this article we have covered the following: perception mechanism and specificity of flower senescence, flower senescence-associated events, like degradation of cell membranes, proteins and nucleic acids, environmental/external factors affecting senescence, like pollination and abiotic stress, hormonal and non-hormonal regulation of flower/petal senescence and finally the senescence associated genes (SAGs) have also been described.

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Section: Hormonal Regulation Of Flower/petal Senescencementioning

confidence: 98%

Integrated Signaling in Flower Senescence

Tripathi

Tuteja

2007

Plant Signaling & Behavior

106

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“…Gibberellic acid is known to delay senescence in some cut carnation flowers by acting as an antagonist to ethylene (Saks et al, 1992;Saks and & Staden, 1993). In Grevillea, higher levels of gibberellic acid was found to enhance flower abscission rather than senescence (Setyadjit et al, 2006), but the treatment did not enhance the longevity of inflorescences as also the ACC level.…”

Section: Involvement Of Hormones (Other Than Ethylene) In Ethylene-sementioning

confidence: 98%

Flower Senescence-Strategies and Some Associated Events

Shahri

Tahir

2011

Bot. Rev.

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Different strategies of petal senescence and some important events associated with it have been discussed. On the basis of sensitivity to ethylene and associated symptoms of senescence, petal senescence has been classified into five different classes; besides changes in membrane permeability, autophagy and involvement of VPEs (Vacuolar processing enzymes), degradation of nucleic acids, protein turn over and remobilization of essential nutrients during petal senescence have been discussed. Nucleus appears to play a central role in administrating the execution of the events associated with petal senescence. Protein turn over appears to be an important factor governing petal senescence in both ethylene-sensitive and ethylene-insensitive flower systems and that the loss of membrane integrity, vacuolar autophagy and remobilization of essential nutrients being its important consequences. Autophagy seems to be a main process responsible for cell dismantling and remobilization of macromolecules besides final disintegration of nucleus. A large number of senescence-associated genes have been found to be differentially expressed during petal senescence. On the basis of the available literature, a schematic model representing some important events associated with petal senescence has been constructed. The review recommends that more elaborate work is required at cellular and organelle level to understand the ethylene-independent pathway and its execution in both ethylene-sensitive and ethylene-insensitive flower systems. It also recommends that ethylene sensitivity should not be generally assigned to plants at the family level on the basis of response of a few species in a family.Résumés des stratégies différentes de pétale senescence et certains événements importants associés ont été discutés. Sur la base d'une sensibilité d'éthylène et les symptômes associés de sénescence, pétale senescence ont été classé en cinq différentes classes ; outre les modifications dans la perméabilité de la membrane, Autophagie et l'implication des VPEs (Vacuolar traitement des enzymes), la dégradation des acides nucléiques, protéines tour sur re de nutriments essentiels au cours de la senescence pétale ont été discutés. Noyau semble jouer un rôle central dans l'administration de l'exécution des événements associés pétale senescence. Tour de protéines sur semble être un facteur important régissant pétale senescence Bot. Rev. (2011) 77:152-184 dans les systèmes de fleur d'éthylène sensibles et éthylène-insensible et que la perte d'intégrité de la membrane, Autophagie vacuolar et re de nutriments essentiels à ses conséquences importantes. Autophagie semble être un processus principal responsable du démantèlement de la cellule et re de macromolécules outre finale désintégration du noyau. Un grand nombre de gènes associés senescence a été trouvé pour être exprimé différemment au cours de la senescence pétale. Sur la base de la documentation disponible, un modèle schematic représentant certains événe-ments importants associés pétale senescence a ét...

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“…However, 1-methylcyclopropene had no effect in the absence of exogenous ethylene. The longevity of cut Grevillea 'Sylvia' inflorescences was extended by dipping them in a solution of 6-benzylaminopurine (Setyadjit et al, 2004b), but vase solutions containing gibberellic acid did not affect vase-life (Setyadjit et al, 2006).…”

Section: Discussionmentioning

confidence: 99%

Competition for water between inflorescences and leaves in cut flowering stems ofGrevillea‘Crimson Yul-lo’

Joyce

Irving

2006

The Journal of Horticultural Science and Biotechnology

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SUMMARYGrevillea cv. 'Crimson Yul-lo' has large bright red terminal inflorescences on leafy stems and has recognised commercial potential as a cut flower crop. A major limitation is its relatively short vase-life, often terminated by early wilting of the inflorescence despite apparently turgid leaves. An investigation of the water relations of cut Grevillea 'Crimson Yul-lo' stems revealed that the water potential of inflorescences on intact stems in vases was significantly higher (i.e., less negative) than that of leaves from day-0 to day-3 of vase-life. Thereafter, the water potential of inflorescences declined more rapidly than that of leaves, accompanied by visible wilting of the tepals and styles of individual florets. Removal of leaves from the stems reduced both water uptake and water loss, and delayed the onset of a negative water balance in the inflorescence. Bagging of entire stems, leaves only, or inflorescences only, with microperforated plastic film to reduce transpiration, reducing leaf number to reduce leaf area, or supplying abscisic acid to reduce leaf stomatal aperture, all aided relative fresh weight retention by stems and extended vase-life. Four or six leaves on a stem caused greater loss in inflorescence water content than zero or two leaves. Considered collectively, these findings show competition for water between the inflorescence and the leaves in cut Grevillea 'Crimson Yul-lo' stems contributes to the onset of inflorescence wilting and their short vaselife.3 revillea is a large genus within the family Proteaceae and it contains over 300 species (Joyce and Beal, 1999), many of which are grown world-wide (Costin and Costin, 1988;Joyce and Beal, 1999;Joyce, 2004). Many grevilleas, especially hybrids of subtropical and tropical species, are woody shrubs or small trees with attractive large, colourful inflorescences and soft, divided fern-like foliage that make them appealing as landscape plants. Their inflorescences also have commercial potential as cut flowers (Costin and Costin, 1988;Joyce, 2004), but a major limitation to their use as cut flowers is their relatively short vase-life of often less than 1 week (Faragher, 1989;Joyce et al., 1996;Joyce and Beal, 1999;Joyce, 2004). Cut stems of Grevillea 'Crimson Yul-lo' (Grevillea banksii × Grevillea 'Misty Pink') have large bright-red terminal inflorescences consisting of 90−120 florets at various developmental stages arranged along a single floral rachis ( Figure 1A, B), but the inflorescences have a vase-life of only three-four days in water.A number of factors influencing the longevity of cut Grevillea flowers have been studied.The vase-life of Grevillea 'Majestic' inflorescences harvested in Winter was generally longer than that of Summer-harvested inflorescences (Vuthapanich et al., 1993). The vase lives of Grevillea 'Sylvia' and Grevillea 'Honey Gem' were dependent upon the harvest maturity stage, with optimum maturity being characterized by opening of the lowest florets (Joyce and Beal, 1999). Addition of sucrose to vase solutions imp...

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Vase treatments containing gibberellic acid do not increase longevity of cut Grevillea 'Sylvia' inflorescences

Cited by 6 publications

References 23 publications

Integrated Signaling in Flower Senescence

Integrated Signaling in Flower Senescence

Flower Senescence-Strategies and Some Associated Events

Competition for water between inflorescences and leaves in cut flowering stems ofGrevillea‘Crimson Yul-lo’

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