Floral Lipoxygenase: Activity during Senescence and Inhibition by Phenidone

Peary, James S.; Prince, T. A.

doi:10.21273/jashs.115.3.455

Cited by 18 publications

(9 citation statements)

References 17 publications

(16 reference statements)

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“…Increases in lipid peroxidation, usually determind from changes in MDA concentration, accompanies the increase in LOX activity while the products of peroxidation are considered to perturb membrane function (Leverentz et al 2002). It has already been reported that LOX activity may promote senescence through oxidative damage membrane as seen in day lily (Panavas and Rubinstein 1998) and gladiolus (Peary and Prince 1990;Hossain et al 2006). Paulin et al (1986) suggested that transformation of lipids leads to membrane breakdown, free radicals are then produced by peroxidation and these free radicals promote the burst of oxidative stress.…”

Section: Resultsmentioning

confidence: 99%

Oxidative stress and antioxidant activity as the basis of senescence in chrysanthemum florets

2007

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Stems of chrysanthemum (Chrysanthemum morifolium Ramat.) cv. Maghi were harvested when half of the buds showed colour and were put in distilled water at 21°C. Flowers showed visible senescence symptoms after 12-15 d. Reactive oxygen species (ROS) concentration and lipid peroxidation increased from young floret stage to the senescent stage. Activities of superoxide dismutase (SOD), ascorbate peroxidase (APX), peroxidase (POD) and catalase (CAT) showed uniform increases from young floret through to the mature stage and thereafter, declined. Among the SOD isoforms, Fe-SOD and Cu/Zn-SOD were induced during the onset of senescence. Similarly different isoforms of APX and glutathione reductase (GR) also appeared during the senescence process. The capacity of the antioxidative defence system increased during the onset of senescence but the imbalance between ROS production and antioxidant defences ultimately led to oxidative damage. It is proposed that a decrease in the activity of a number of antioxidant enzymes that normally prevent the build up of free radicals can at least partially account for the observed senescence of chrysanthemum florets.

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Section: Resultsmentioning

confidence: 99%

Oxidative stress and antioxidant activity as the basis of senescence in chrysanthemum florets

2007

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“…GA 3 has also been known to restrict the oxidation of polyunsaturated fatty acids (Wood and Pleg 1974) which can lead to a reduced peroxidation of lipids. Lipid peroxidation in gladiolus is LOX mediated (Peary and Prince 1990). Reduced peroxidation of lipids and higher SOD and GR activity helps to sustain the fluidity of the lipid bilayers and stabilizes the membrane system (Scandalios 1993;Klapheck 1988).…”

Section: Discussionmentioning

confidence: 99%

Effects of plant growth regulators and sucrose on post harvest physiology, membrane stability and vase life of cut spikes of gladiolus

Singh

Kumar

Kumar³

2008

Plant Growth Regul

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Effects of post-harvest application of two plant growth regulators viz., gibberellic acid (GA 3 ) and benzyl adenine (BA) with sucrose in the vase solution on cell membrane stability and vase life of gladiolus were investigated. The vase solution treatment combinations of GA 3 and BA with sucrose significantly increased the membrane stability index and enhanced the vase life as compared to the sucrose alone treatments or the controls. Vase solution treatment of GA 3 (50 mg l -1 ), followed by BA (50 mg l -1 ) with sucrose (50 g l -1 ) significantly increased solution uptake, fresh weight and dry weight of cut spikes. The same treatments also enhanced the concentration of reducing and nonreducing sugars in gladioli petals 4 days after treatment (DAT). Cut spikes in vase solution enriched with 50 mg l -1 GA 3 + 50 g l -1 sucrose showed higher antioxidative enzyme activities of superoxide dismutase (SOD) and glutathione reductase (GR), lower lipoxygenase (LOX) activity and lipid peroxidation (measured as TBARS). Petal membrane stability index was also highest in cut spikes 6 DAT with 50 mg l -1 GA 3 + 50 g l -1 sucrose vase solution. Treatment of gladiolus cut spikes with 50 mg l -1 GA 3 + 50 g l -1 sucrose vase solution showed two fold increase in vase life and improved flower quality with a higher number of open flower per spike at any one time. These results suggest that post-harvest application of GA 3 (50 mg l -1 ) with sucrose (50 g l -1 ) maintains higher spike fresh and dry weight, improves anti-oxidative defence, stabilizes membrane integrity leading to a delay in petal cell death.

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“…40 Thus Alstroemeria represents a distinct pattern of floral senescence that is both ethylene-and lipoxygenase-independent.…”

Section: Flower Senescence Associated Eventsmentioning

confidence: 99%

Integrated Signaling in Flower Senescence

Tripathi

Tuteja

2007

Plant Signaling & Behavior

108

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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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Floral Lipoxygenase: Activity during Senescence and Inhibition by Phenidone

Cited by 18 publications

References 17 publications

Oxidative stress and antioxidant activity as the basis of senescence in chrysanthemum florets

Oxidative stress and antioxidant activity as the basis of senescence in chrysanthemum florets

Effects of plant growth regulators and sucrose on post harvest physiology, membrane stability and vase life of cut spikes of gladiolus

Integrated Signaling in Flower Senescence

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