The regulation of the biosynthesis of glutathione in leaves of barley (Hordeum vulgare L.)

Smith, Ivan K.; Kendall, A. C.; Keys, A. J.; Turner, J. C.; Lea, Peter J.

doi:10.1016/0168-9452(85)90059-7

Cited by 99 publications

(78 citation statements)

References 13 publications

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“…It may also, through its ability to reduce dehydroascorbate (5), function in the chloroplast 02 and H202 scavenging system ( 12). Ten to 50% of the cellular glutathione is chloroplastic while the remainder is cytosolic (9,31). Over 95% of each pool has been reported to be reduced (5) although Smith et al(3 1) report that up to 35% of the chloroplast glutathione may be oxidized.…”

Section: Resultsmentioning

confidence: 99%

“…About 30 to 40% of the cellular ascorbate (6,7,9), 10 to 50% of the glutathione (31), all of the a tocopherol (1, 1 1), and all of the ,B carotene (1 1) are localized in the chloroplast even though chloroplasts occupy only 3 to 4% of the total cellular volume in a mature leaf mesophyll cell (21). Ascorbate and glutathione are both water-soluble antioxidants involved in the removal of such photosynthetically generated oxidants as 2-and H202 (12).…”

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confidence: 99%

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Chilling-Enhanced Photooxidation

Wise¹,

Naylor²

1987

Plant Physiol.

397

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Chilling temperatures (5°C) and high irradiance (1000 microeinsteins per square meter per second) were used to induce photooxidation in detached leaves of cucumber (Cucumis sativus L.), a chilling-sensitive plant. Chlorophyll a, chlorophyll b, ,B carotene, and three xanthophylls were degraded in a light-dependent fashion at essentially the same rate.Lipid peroxidation (measured as ethane evolution) showed an 02 dependency. The levels of three endogenous antioxidants, ascorbate, reduced glutathione, and a tocopherol, all showed an irradiance-dependent decline. a-Tocopherol was the first antioxidant affected and appeared to be the only antioxidant that could be implicated in long-term protection of the photosynthetic pigments. Results from the application of antioxidants having relative selectivity for '02, 02-, or OH indicated that both '02 and 2-were involved in the chilling-and light-induced lipid peroxidation which accompanied photooxidation. Application of D20 (which enhances the lifetime of '02) corroborated these results. Chilling under high light produced no evidence of photooxidative damage in detached leaves of chilling-resistant pea (Pisum sativum L.). Our results suggest a fundamental difference in the ability of pea to reduce the destructive effects of free-radical and '02 production in chloroplasts during chilling in high light.

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Section: Resultsmentioning

confidence: 99%

mentioning

confidence: 99%

Chilling-Enhanced Photooxidation

Wise¹,

Naylor²

1987

Plant Physiol.

397

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“…Reactive oxygen species and free radicals oxidate nucleic acids, proteins and lipids in the oxidative stress period. It has also been determined by researchers that antioxidants may be reduced in the event of stress in different environments [48][49][50]. SH contents in the leaf of Washington and Valencia were found to be at higher levels before pesticid application [39].…”

Section: Sulfhydryl Concentrationsmentioning

confidence: 99%

“…album was determined as the highest on Almond (Amygdalus spp.) 48.54%, Apricot (Prunus armenica L.) 34.98 % and Pear (Pyrus communis L.) 28.64%. [13][14][15].…”

Section: Introductionmentioning

confidence: 99%

Determination of the chemical compositions of Viscum album ssp. album and soft core hosts

Üstüner¹,

Düzenli²

2017

J.Chem.Metrol.

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Abstract:In this study, leaf proportional water content, chlorophyll a and b, total chlorophyll, carotenoid, proline, total amino acid, ascorbic acid, glucose, fructose and sulphydryl group (SH) were determined in both Viscum album ssp. album and its hosts. Physiological alterations in soft-core fruits such as Ankara pear, Braeburn apple and hawtorn when infected with Viscum album ssp. album were investigated. While proportional water content of V. a. ssp. album was found higher than all fruit trees with or without V. album (control), its chlorophyll a content was lower than only control and two hosts (Braeburn apple and Ankara pear). Chlorophyll b content, on the other hand, was similar in all experimental groups for Ankara pear and hawthron whereas, in Braeburn apple, it was significantly higher in control. As for the total chlorophyll and carotenoid contents of V.a. ssp. album, in Breaburn and Ankara pear, they were found less than the controls and hosts whilst in hawthorn, the values were variable. Although proline content of V. a. ssp. album was higher compared to their controls and hosts, total amino acid, reduced and total ascorbic acid, glucose, fructose and sulphydryl acid in V. a. ssp. album were determined to be lower than all uninfected fruits (control).

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“…GSH levels in tom~lto decreased about two times when compared to that of grapes. In plants, GSH concentration is reported to be higher in chloroplasts (4 raM) and a significant quantity also accumulates in cytosol (34). In plants, the role of In a column, means followed by a common letter are not significantly different at the 5% level by DMRT.…”

Section: Non-enzymatic Antioxidantsmentioning

confidence: 94%

Evaluation of antioxidant properties of berries

Rani

Unni²,

Karthikeyan³

2004

Indian J Clin Biochem

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The present paper focuses on assessing the levels of various enzymatic and non-enzymatic antioxidants in selected berries of Indian sub-continent viz., gooseberry, grapes, orange and tomato. This study has revealed that orange, tomato and grapes possess predominant quantities of enzymatic antioxidants namely SOD, catalase and glutathione peroxidase respectively. The levels of antioxidants analyzed namely reduced glutathione, vitamin C and vitamin A were maximal in grapes, orange and tomato respectively. All the extracts of berries included in the present study inhibited iron induced in vitro lipid peroxidation in erythrocytes, the extend of inhibition being highest for gooseberry and orange compared to tomato and grapes which could be attributed to their in-built antioxidant system.

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The regulation of the biosynthesis of glutathione in leaves of barley (Hordeum vulgare L.)

Cited by 99 publications

References 13 publications

Chilling-Enhanced Photooxidation

Chilling-Enhanced Photooxidation

Determination of the chemical compositions of Viscum album ssp. album and soft core hosts

Evaluation of antioxidant properties of berries

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