The Activated Oxygen Role of Peroxisomes in Senescence1

Rı́o, Luis A. del; Pastori, Gabriela M.; Palma, José M.; Sandalio, Luisa M.; Sevilla, Francisca; Corpas, Francisco J.; Jiménez, Ana; López‐Huertas, Eduardo; Hernández, José Antonio

doi:10.1104/pp.116.4.1195

Cited by 352 publications

(183 citation statements)

References 27 publications

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“…On another hand, senescence is an oxidative process that involves the overproduction of active oxygen species (AOS). Cellular damage caused by AOS, via lipid peroxidation, is generally considered to be a major contributor to the senescence syndrome (del Río et al 1998). The antioxidant enzymes namely, superoxide dismutase, catalase, peroxidase and the ascorbate-glutathione cycle enzymes play a vital role in detoxifying the active oxygen species and help the plant to continue the growth (Asada 1996).…”

Section: Discussionmentioning

confidence: 99%

“…This reduction in photosynthesis during senescence is associated with the breakdown of protein and pigment content and degradation of membrane lipids (Quirino et al 2000;Chen et al 2003;Falqueto et al 2010;Shu-Kun et al 2010). Chloroplasts are also the organelles most exposed to active oxygen species toxicity because they function at conditions of high oxygen concentration and light intensity (del Río et al 1998;Gara et al 2000;. If the excess energy is not dissipated efficiently, active oxygen species are generated, which reflects the severe damage to the photosynthetic apparatus and accelerates the progress of leaf senescence (Hung and Kao 2004;Panda et al 2006;Šraj-Kržič et al 2009).…”

Section: Introductionmentioning

confidence: 99%

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Natural leaf senescence: probed by chlorophyll fluorescence, CO2 photosynthetic rate and antioxidant enzyme activities during grain filling in different rice cultivars

Panda

Sarkar

2012

Physiol Mol Biol Plants

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Natural leaf senescence was investigated in four rainfed lowland rice cultivars, FR 13A (tolerant to submergence), Sabita and Sarala (adapted to medium depth, 0-50 cm stagnant flooding) and Dengi (conventional farmers' cultivar). Changes in the levels of pigment content, CO 2 photosynthetic rate, photosystem II photochemistry and anti-oxidant enzyme activities of flag leaves during grain-filling stage were investigated. Chlorophyll content, photochemical efficiency of photosystem II and CO 2 photosynthetic rate decreased significantly with the progress of grain-filling. Likely, the activities of antioxidant enzymes namely, superoxide dismutase, catalase, guaiacol peroxidase and ascorbate peroxidase decreased with progress of grain-filling. A substantial difference was observed among the four cultivars for the sustainability index (SI) of different photosynthetic parameters and antioxidant enzyme activities; SIs of those parameters, in general, were lower in low yielding cultivar FR 13A compared to the other three cultivars. Among the four cultivars Sabita gave maximum grain yield. Yet, SI of Pn was greater in Sarala and Dengi compared to the Sabita. SIs of electron transport (ETo/CS), maximal photochemical efficiency (Fv/Fm), area above Fo and Fm, catalase and ascorbate peroxidase were also greater in Sarala and Dengi. The data showed that among the different Chl a fluorescence parameters, PI could be used with greater accuracy to distinguish slow and fast senescence rice cultivars during grain-filling period. It was concluded that maintaining the vitality of rice plants during grainfilling gave guarantee to synthesize carbohydrate, however greater yield could be realized provided superior yield attributing parameters are present.

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Natural leaf senescence: probed by chlorophyll fluorescence, CO2 photosynthetic rate and antioxidant enzyme activities during grain filling in different rice cultivars

Panda

Sarkar

2012

Physiol Mol Biol Plants

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“…In spite of such an efficient defense system, plant cells suffer from oxidative damage under biotic and abiotic stress conditions (Apel and Hirt, 2004). Over-accumulation of ROS occurs either because of their over-production (del Rio et al, 1998) or due to dysfunctioning of antioxidative defense system becoming unable to scavenge them fully (Kanazawa et al, 2000;Palma et al, 2006).…”

Section: Introductionmentioning

confidence: 99%

Oxidative stress and antioxidant systems in Guava (Psidium guajava L.) fruits during ripening

Mondal

Malhotra

Jain

et al. 2009

Physiol Mol Biol Plants

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Two varieties of guava viz., L-49 and Hisar Safeda differing in their shelf lives were analyzed for various components of oxidative stress and of enzymatic and non-enzymatic antioxidative system at different stages of fruit ripening. Indices of oxidative stress viz., lipoxygenase activity, malondialdehyde value and H 2 O 2 content increased throughout during ripening in both the varieties. The extent of oxidative stress was more pronounced in Hisar Safeda (shelf life 3-4 days) than in L-49 (shelf life 7-8 days). Except for superoxide dismutase, activities of all other antioxidative enzymes viz., catalase, peroxidase, ascorbate peroxidase and glutathione reductase increased up to color turning stage and decreased thereafter. Superoxide dismutase activity, however, increased upto ripe stage followed by a decline. Contents of ascorbic acid and glutathione (total, oxidized and reduced) were found to be the maximum at turning and mature stage, respectively. It is inferred that ripening of guava fruit is accompanied by a progressive increase in oxidative/ peroxidative stress which induces antioxidant system but not until later stages of ripening. Over-accumulation of ROS due to dysfunctioning of ROS scavenging system at later stages of fruit ripening appears to be responsible for loss of tissue structure as observed in ripened and over-ripened fruits.

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“…It has been suggested that the ASC-GSH cycle in mitochondria and peroxisomes could represent an important antioxidant system against H # O # as it is being generated in both cell organelles in normal and stress conditions (Jime! nez et al, 1997a ;del Rı! o et al, 1998).…”

Section:   mentioning

confidence: 99%

Response of antioxidant systems and leaf water relations to NaCl stress in pea plants

et al. 1999

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A pea (Pisum sativum cv. Puget) cultivar was grown on a medium containing different NaCl concentrations (0-160 mol m −$ ) in order to study the effects of salt stress on leaf water relations and on the activity of antioxidant enzymes. NaCl stress caused a rapid decline in chlorophyll content. Both leaf water (ψ l ) and osmotic potentials (ψ s ) decreased progressively with the severity of the stress (from 90-160 mol m −$ NaCl) whereas leaf turgor pressure (ψ p ) increased in treated plants. Pea leaves contained an iron-containing superoxide dismutase (Fe-SOD) isozyme in chloroplasts alongside a copper-zinc-containing (CuZn-SOD) form (CuZn-SOD II). The lowest NaCl concentration (70 mol m −$ ) had no effect on the activity of these antioxidant enzymes while higher concentrations (110-130 mol m −$ ) enhanced the activity of cytosolic CuZn-SOD I and chloroplastic CuZn-SOD II as well as that of mitochondrial and\or peroxisomal manganese-containing superoxide dismutase (Mn-SOD). These inductions were matched by increases in the activity of ascorbate peroxidase (APX) and monodehydroascorbate reductase (MDHAR). The increased activities coincided with decreased stomatal conductance and were unaffected by the severity of stress except in the case of CuZn-SOD II which fell to control values under the highest stress conditions (140-160 mol m −$ NaCl), when a concomitant increase in chloroplastic Fe-SOD activity was observed. Glutathione reductase (GR) and dehydroascorbate reductase (DHAR) activities were only induced under severe NaCl stress (130-160 mol m −$ ) and were accompanied by losses in the ascorbate and glutathione pools, lower ASC\DHA and GSH\GSSG ratios and increases in GSSG. Electron microscopy showed that the thylakoidal structure of the chloroplasts became disorganized and their starch content decreased in plants treated with 160 mol m −$ NaCl. Overall, the results suggest that salt stress is accompanied by oxidative stress, perhaps at the cell compartment level. The capacity of Puget cultivar to ensure cell turgor and to enhance the activity of enzymes involved in the defence against oxidative stress seems to be important in determining adaptation to moderate NaCl stress conditions. In plants exposed to severe NaCl stress (130-160 mol m −$ ) it seems that such resistance to oxidative stress is overcome, which might contribute to the deleterious effects of salt and significant growth reduction in these conditions.

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The Activated Oxygen Role of Peroxisomes in Senescence1

Cited by 352 publications

References 27 publications

Natural leaf senescence: probed by chlorophyll fluorescence, CO2 photosynthetic rate and antioxidant enzyme activities during grain filling in different rice cultivars

Natural leaf senescence: probed by chlorophyll fluorescence, CO2 photosynthetic rate and antioxidant enzyme activities during grain filling in different rice cultivars

Oxidative stress and antioxidant systems in Guava (Psidium guajava L.) fruits during ripening

Response of antioxidant systems and leaf water relations to NaCl stress in pea plants

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