Ascorbate is the natural substrate for plant peroxidases

Mehlhorn, H.; Lelandais, Maud; Korth, Hans‐Gert; Foyer, Christine H.

doi:10.1016/0014-5793(95)01448-9

Cited by 154 publications

(56 citation statements)

References 46 publications

(80 reference statements)

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“…4A, top trace). One explanation for thís result would be the preferential oxidation of ascorbate by peroxidase instead of SF1, as proposed by Mehlhorn et al (1996). However, as shown in Figure 4B (top trace), the activity of ascorbate in the GuPX reaction is very low.…”

Section: Oxidation Of Flavonols By Ho In Conjunction With the Solubmentioning

confidence: 82%

Flavonoid-Peroxidase Reaction as a Detoxification Mechanism of Plant Cells against H2O2

1997

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Section: Oxidation Of Flavonols By Ho In Conjunction With the Solubmentioning

confidence: 82%

Flavonoid-Peroxidase Reaction as a Detoxification Mechanism of Plant Cells against H2O2

1997

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“…The detoxification of H 2 O 2 is accomplished with ascorbate peroxidase, glutathione peroxidase, catalase, and 2-Cys peroxiredoxin. The most important reducing substrate for H 2 O 2 detoxification in plant cell is ascorbate [53]. Ascorbate peroxidase reduces H 2 O 2 to water, with the concomitant generation of monodehydroascorbate (MDHA).…”

Section: The Constitutive High Expression Level Of Several Key Oxidatmentioning

confidence: 99%

Proteomic responses of rice young panicles to salinity

et al. 2006

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Rice (Oryza sativa) is most sensitive to salinity during the reproductive stage. We employed a proteomic approach to further understand the mechanism of plant responses to salinity at an early reproductive stage. Plants were grown in culture solution and salt stress imposed at panicle initiation. After 12 days of stress, young panicles were collected from control and salt stressed plants. The Na + and K + content of panicle and several yield components changed significantly in response to short-term salt stress. The collected panicles were sorted into three different sizes (7 6 1, 11 6 1, and 15 6 1 mm) and their proteome patterns were analyzed using 2-DE in triplicates. The expression pattern of 13 proteins significantly changed in all panicle sizes in response to stress. MS analysis of salt responsive proteins and 16 other highly abundant proteins of panicle led to the identification of proteins involved in several salt responsive mechanisms which may increase plant adaptation to salt stress including higher constitutive expression level and upregulation of antioxidants, up-regulation of proteins involved in translation, transcription, signal transduction, and ATP generation. To the best of our knowledge, this is the first proteome analysis of plant young panicle which may enhance our understanding of plant molecular responses to salinity. Proteome reference map of rice young panicle is available at http://www.proteome.ir.

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“…The nonenzymatic antioxidant system includes ascorbate (AsA), glutathione (GSH), carotenoids (lycopene, carotene), α-tocopherol and many other phenolic compounds. AsA is a major primary antioxidant synthesized on the inner membrane of the mitochondria which reacts chemically with 1 O 2 , O 2 .− , HO − and thiol radical (Noctor and Foyer 1998), and acts as the natural substrate of many plant peroxidases (Mehlhorn et al 1996). Moreover, AsA is involved in other functions such as plant growth, gene regulation, and modulation of some enzymes and redox regulation of membranebound antioxidant compounds (Horemans et al 2000).…”

Section: Introductionmentioning

confidence: 99%

Effect of water stress on antioxidant systems and oxidative parameters in fruits of tomato (Solanum lycopersicon L, cv. Micro-tom)

Murshed

Lopez-Lauri²,

Sallanon

2013

Physiol Mol Biol Plants

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The effects of different levels of water stress on oxidative parameters (H 2 O 2 and MDA), the total pool sizes of ascorbate, the activities of antioxidant enzymes superoxide dismutase (SOD) and catalase (CAT), as well as the activities and relative transcript levels of the enzymes of ascorbate-glutathione cycle ascorbate peroxidase (APX), monodehydroascorbate reductase (MDHAR), dehydroascorbate reductase (DHAR) and glutathione reductase (GR) were studied in the fruit of tomato (Solanum lycopersicum L. cv. Micro-Tom). Plants were subjected to three levels of water stress (S50, S25 and S0) and fruits at different development stages were harvested after 3, 6 and 10 days of stress. Changes in H 2 O 2 and MDA contents indicated that water stress induced oxidative stress in fruits. The concentrations of ascorbate (AsA) and dehydroascorbate (DHA) generally modified with water stress treatments. Moreover, changes in SOD and CAT activities and DHAR, MDHAR, APX and GR activities and relative transcript levels were dependent on the fruit development stage and the intensity and the duration of water stress. These results suggest that the response of antioxidant systems of tomato fruits to oxidative stress induced by water stress treatments was different depending on the fruit development stage.

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Ascorbate is the natural substrate for plant peroxidases

Cited by 154 publications

References 46 publications

Flavonoid-Peroxidase Reaction as a Detoxification Mechanism of Plant Cells against H2O2

Flavonoid-Peroxidase Reaction as a Detoxification Mechanism of Plant Cells against H2O2

Proteomic responses of rice young panicles to salinity

Effect of water stress on antioxidant systems and oxidative parameters in fruits of tomato (Solanum lycopersicon L, cv. Micro-tom)

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