Characterization of a Novel Lipoxygenase-Independent Senescence Mechanism in <i>Alstroemeria peruviana</i> Floral Tissue

Leverentz, Michael K.; Wagstaff, Carol; Rogers, Hilary J.; Stead, Anthony D.; Chanasut, Usawadee; Silkowski, Helena; Thomas, Brian; Weichert, Heiko; Feußner, Ivo; Griffiths, Gareth

doi:10.1104/pp.000919

Cited by 55 publications

(39 citation statements)

References 51 publications

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“…Although the role of LOX in Chl degradation in vivo is still controversial (Takamiya et al 2000), some studies have reported that Chl degradation is coupled with the oxidation of unsaturated fatty acids by LOX (Jaren-Galan et al 1999). In petal senescence in Alstroemeria peruviana and postharvest storage of broccoli, a decrease in LOX activity is associated with Chl loss (Zhuang et al 1997, Leverentz et al 2002. The similar results in our study support this relationship between LOX activity and Chl degradation.…”

Section: ⎯⎯⎯⎯supporting

confidence: 91%

Gibberellin retards chlorophyll degradation during senescence of Paris polyphylla

Li¹,

Yu²,

Wei³

et al. 2010

Biologia plant.

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Chlorophyll (Chl) degradation was found to be related to the endogenous gibberellin (GA) content in shoots during senescence in the perennial plant Paris polyphylla var. yunnanensis (Franch.). Treatment with gibberellic acid (GA 3 ) significantly increased the content of endogenous GAs (GA 4 + GA 7 ), retarded the senescence of shoots, and the degradation of proteins and Chl. Chlorophyllase, Mg-dechelation and peroxidase activities increased more in control plants than in those treated with GA 3 . GA 3 treatment also protected lipoxygenase activity, which decreased significantly in control plants.

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Section: ⎯⎯⎯⎯supporting

confidence: 91%

Gibberellin retards chlorophyll degradation during senescence of Paris polyphylla

Li¹,

Yu²,

Wei³

et al. 2010

Biologia plant.

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“…Membrane polyunsaturated fatty acids are prone to oxidation either by enzymatic means (LOX) or through autoxidative events (non-enzyme catalyzed). 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).…”

Section: Resultsmentioning

confidence: 95%

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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“…Large reductions in total protein content typically occur in senescing organs (Buchanan-Wollaston et al 2003, Hensel et al 1993) and may reflect a lack of synthesis or increased protein catabolism in flavedo with reduced ATP content after CMNP treatment (Alferez et al 2005). Increased electrolyte leakage was an early event induced by CMNP, indicating a loss of membrane semipermeability and onset of senescence (Leverentz et al 2002, Thompson et al 1998 caused by the substituted pyrazole. AT treatment was unable to arrest CMNP-induced electrolytic leakage.…”

Section: Discussionmentioning

confidence: 99%

Physiological changes associated with senescence and abscission in mature citrus fruit induced by 5‐chloro‐3‐methyl‐4‐nitro‐1H‐pyrazole and ethephon application

Alférez

Pozo

Burns

2006

Physiologia Plantarum

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This research compares effects of the compound 5-chloro-3-methyl-4-nitro-1H-pyrazole (CMNP), a plant growth regulator that selectively promotes abscission in mature citrus fruit (Citrus sinensis), and the ethylene-releasing agent ethephon (2-chloroethylphosphonic acid). Application of CMNP and ethephon to mature citrus fruit reduced fruit detachment force and changed peel color from green to orange. More total chlorophyll was extracted from flavedo in early season (November) than late season (January), and both compounds caused a similar reduction in chlorophyll. In contrast, total carotenoid content was similar in November and January. Both abscission compounds increased total carotenoids, but induction was greater in January, and CMNP was more effective in both months. Phospholipase A 2 (PLA 2 ) activity increased after CMNP but not ethephon application. Electrolyte leakage increased 2 h after CMNP treatment, and total protein content was reduced by 50% after 72 h. Ethephon caused only minor changes in electrolyte leakage and total protein content. Inhibition of PLA 2 activity with aristolochic acid did not reduce leakage but inhibited total protein loss and reduced visual peel damage associated with CMNP. Ultrastructural observations indicated decreased number, and length of starch grains 3 h after CMNP treatment. A transient increase in soluble sugars was measured 3 h after CMNP application. Ethephon had little effect on soluble sugar content and changes in starch grains. Collectively, the results indicate that CMNP and ethephon induced color change in peel and advanced mature fruit abscission. However, CMNP but not ethephon promoted other physiological changes associated with senescence.

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Characterization of a Novel Lipoxygenase-Independent Senescence Mechanism in Alstroemeria peruviana Floral Tissue

Cited by 55 publications

References 51 publications

Gibberellin retards chlorophyll degradation during senescence of Paris polyphylla

Gibberellin retards chlorophyll degradation during senescence of Paris polyphylla

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

Physiological changes associated with senescence and abscission in mature citrus fruit induced by 5‐chloro‐3‐methyl‐4‐nitro‐1H‐pyrazole and ethephon application

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