Modulation of exogenous glutathione in antioxidant defense system against Cd stress in the two barley genotypes differing in Cd tolerance

Chen, Fei; Fang, Wang; Wu, Feibo; Mao, Weihua; Zhang, Guoping; Zhou, Meixue

doi:10.1016/j.plaphy.2010.05.001

Cited by 265 publications

(139 citation statements)

References 36 publications

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“…The decrease in Fv/Fm is a sign of photoinhibition; on the other side, the decrease of Fv/Fm under Cd stress also indicates that the photochemistry of PSII and its ability to reduce the primary acceptor Q A are also affected by Cd; this reduction under Cd exposure may be attributed to the inhibition of chlorophyll content biosynthesis or due to an altered stoichiometry between PSI and PSII (Babani & Lichtenthaler, 1996;Ding et al, 2008 •-and ·OH (Fig. 4), Se-subdued ·OH, H 2 O 2 and MDA formation were supported by several recent reports (Chen et al, 2010;Lin et al, 2012;Sun et al, 2013;Liu et al, 2015), which have illustrated Se could regulate ROS production and quenching, this control in plants may be a key mechanism for counteracting environmental stress.…”

Section: Se Balances Cd-induced Changes In Carbohydrate Contentssupporting

confidence: 80%

Alleviation of cadmium toxicity in cucumber (Cucumis sativus) seedlings by the application of selenium

Sun

Wang

et al. 2017

Span. j. agric. res.

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In the present study, the role of selenium in cadmium toxicity was investigated in cucumber seedlings by hydroponic experiments. The application of Se for cucumber exposed to Cd significantly reduced Cd accumulation in all tissues, elevated Cd-depressed chlorophyll content, and improved photosynthetic performance. External Se significantly reduced ·OH, H 2 O 2 and malondialdehyde content. Exogenous Se balanced Cd-depressed elements (e.g., Se enhanced Cd-induced decreases in root Zn, leaf/stem/root Mn concentrations) and carbohydrate contents. External Se also significantly decreased the Cd-induced increases in Na + K + -, Ca 2+ Mg 2+ -and total ATPase activities, which recovered almost to control level. Results indicate that application of Se can alleviate Cd toxicity in cucumber seedlings by reducing Cd uptake and reactive oxygen species (ROS) accumulation, moreover protecting photosynthetic machinery from damaging, balancing elements and carbohydrate contents, and improving ATPase activities in cucumber.Additional key words: alleviating effects; photosynthetic performance; ATPase.

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Section: Se Balances Cd-induced Changes In Carbohydrate Contentssupporting

confidence: 80%

Alleviation of cadmium toxicity in cucumber (Cucumis sativus) seedlings by the application of selenium

Sun

Wang

et al. 2017

Span. j. agric. res.

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“…8,10 Many reports state that cellular GSH content increased or decreased or remained constant after metal exposure and is related to the difference in species/genotypes or the experimental conditions. [11][12][13][14][15] In our study, reduced and oxidized GSH increased markedly in Cu-stressed seedlings while the GSH/GSSG ratio decreased. 6 Cuypers et al 13 also reported similar findings in which the levels of GSH, GSSG, and the GSSG/GSH ratio were always higher in Cu-treated plants than the control.…”

mentioning

confidence: 86%

Interactive effects of nitric oxide and glutathione in mitigating copper toxicity of rice (Oryza sativaL.) seedlings

Mostofa

Seraj

Fujita

2015

Plant Signaling & Behavior

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Nitric oxide (NO) and glutathione (GSH) are 2 vital components of the antioxidant system that play diverse roles in plant responses to abiotic stresses. Recently, we have reported that exogenous supply of both these molecules reduced copper (Cu) toxicity in rice seedlings. Individual as well as co-treatment of sodium nitroprusside (SNP: a NO donor) and GSH with Cu significantly mitigated the adverse effects of Cu, evident in the reduced level of oxidative markers such as H 2 O 2 , superoxide (O 2 ¢¡ ), malondialdehyde (MDA), and proline (Pro). GSH content and most of the antioxidative and glyoxalase enzymes were up-regulated upon Cu stress, indicating their responses were co-related with the level of stress. Our results indicated that direct ROS scavenging, reduced Cu uptake, and the balanced antioxidative and glyoxalase systems, at least in part, successfully executed NO-and GSH-mediated alleviation of Cu toxicity in rice seedlings. In addition, the combined effect of adding SNP and GSH together was more efficient than the effect of adding them individually. Here, we are speculating that 1) GSH and Pro could be used as potential markers for copper stress, and 2) adding SNP and GSH might produce S-nitrosoglutathione (GSNO) which could be a source of bioactive NO and may affect many regulatory processes involved in Cu-stress tolerance. We further note that the combined effect of adding SNP and GSH was pronounced in inhibiting the uptake and translocation of Cu in rice seedlings.

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“…The mechanisms underlying the improvement in physiological processes under stress indicates various others roles for GSH which deserve further research (Wang et al 2011). Chen et al (2010) studied the antioxidant functions of GSH that enhanced Cd stress tolerance in rice. Oxidative stress is reduced due to the regulation of antioxidant enzymes by GSH which renders better survival of the rice plants.…”

Section: Toxic Metals/metalloidsmentioning

confidence: 99%

Glutathione in plants: biosynthesis and physiological role in environmental stress tolerance

Hasanuzzaman

Nahar

Anee

et al. 2017

Physiol Mol Biol Plants

592

284

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Glutathione (GSH; c-glutamyl-cysteinyl-glycine) is a small intracellular thiol molecule which is considered as a strong non-enzymatic antioxidant. Glutathione regulates multiple metabolic functions; for example, it protects membranes by maintaining the reduced state of both a-tocopherol and zeaxanthin, it prevents the oxidative denaturation of proteins under stress conditions by protecting their thiol groups, and it serves as a substrate for both glutathione peroxidase and glutathione S-transferase. By acting as a precursor of phytochelatins, GSH helps in the chelating of toxic metals/metalloids which are then transported and sequestered in the vacuole. The glyoxalase pathway (consisting of glyoxalase I and glyoxalase II enzymes) for detoxification of methylglyoxal, a cytotoxic molecule, also requires GSH in the first reaction step. For these reasons, much attention has recently been directed to elucidation of the role of this molecule in conferring tolerance to abiotic stress. Recently, this molecule has drawn much attention because of its interaction with other signaling molecules and phytohormones. In this review, we have discussed the recent progress in GSH biosynthesis, metabolism and its role in abiotic stress tolerance.

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Modulation of exogenous glutathione in antioxidant defense system against Cd stress in the two barley genotypes differing in Cd tolerance

Cited by 265 publications

References 36 publications

Alleviation of cadmium toxicity in cucumber (Cucumis sativus) seedlings by the application of selenium

Alleviation of cadmium toxicity in cucumber (Cucumis sativus) seedlings by the application of selenium

Interactive effects of nitric oxide and glutathione in mitigating copper toxicity of rice (Oryza sativaL.) seedlings

Glutathione in plants: biosynthesis and physiological role in environmental stress tolerance

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