Selenium-induced oxidative stress in coffee cell suspension cultures

Gomes-Junior, Rui A.; Gratão, Priscila Lupino; Gaziola, Salete Aparecida; Mazzafera, Paulo; Lea, Peter J.; Azevedo, Ricardo Antunes

doi:10.1071/fp07010

Cited by 105 publications

(61 citation statements)

References 49 publications

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“…Increased ROS may also be formed directly from selenite and GSH in vitro (Saitoh and Imuran, 1987). Se treatment has been shown previously to induce ROS accumulation in Arabidopsis leaves and coffee (Coffea arabica) cells (Gomes-Junior et al, 2007;Tamaoki et al, 2008b). The production of ROS in the two Stanleya species was analyzed in situ using stains sensitive to superoxide and hydrogen peroxide.…”

Section: Effects Of Se On Leaf Physiologymentioning

confidence: 99%

“…These two seleno-amino acids can be misincorporated into proteins, replacing Cys and Met, which causes Se toxicity Shrift, 1981, 1982;Stadtman, 1996). It has also been shown that Se causes reactive oxygen species (ROS) formation and oxidative stress in plants ( Gomes-Junior et al, 2007;Tamaoki et al, 2008b). Se toxicity in plants may directly result from the ROS generated via selenite reacting with reduced glutathione (GSH), as shown in vitro (Saitoh and Imuran, 1987).…”

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confidence: 99%

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Molecular Mechanisms of Selenium Tolerance and Hyperaccumulation in Stanleya pinnata

Freeman

Tamaoki²,

Stushnoff³

et al. 2010

Plant Physiol.

220

187

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The molecular mechanisms responsible for selenium (Se) tolerance and hyperaccumulation were studied in the Se hyperaccumulator Stanleya pinnata (Brassicaceae) by comparing it with the related secondary Se accumulator Stanleya albescens using a combination of physiological, structural, genomic, and biochemical approaches. S. pinnata accumulated 3.6-fold more Se and was tolerant to 20 mM selenate, while S. albescens suffered reduced growth, chlorosis and necrosis, impaired photosynthesis, and high levels of reactive oxygen species. Levels of ascorbic acid, glutathione, total sulfur, and nonprotein thiols were higher in S. pinnata, suggesting that Se tolerance may in part be due to increased antioxidants and up-regulated sulfur assimilation. S. pinnata had higher selenocysteine methyltransferase protein levels and, judged from liquid chromatography-mass spectrometry, mainly accumulated the free amino acid methylselenocysteine, while S. albescens accumulated mainly the free amino acid selenocystathionine. S. albescens leaf x-ray absorption near-edge structure scans mainly detected a carbon-Se-carbon compound (presumably selenocystathionine) in addition to some selenocysteine and selenate. Thus, S. albescens may accumulate more toxic forms of Se in its leaves than S. pinnata. The species also showed different leaf Se sequestration patterns: while S. albescens showed a diffuse pattern, S. pinnata sequestered Se in localized epidermal cell clusters along leaf margins and tips, concentrated inside of epidermal cells. Transcript analyses of S. pinnata showed a constitutively higher expression of genes involved in sulfur assimilation, antioxidant activities, defense, and response to (methyl)jasmonic acid, salicylic acid, or ethylene. The levels of some of these hormones were constitutively elevated in S. pinnata compared with S. albescens, and leaf Se accumulation was slightly enhanced in both species when these hormones were supplied. Thus, defense-related phytohormones may play an important signaling role in the Se hyperaccumulation of S. pinnata, perhaps by constitutively up-regulating sulfur/Se assimilation followed by methylation of selenocysteine and the targeted sequestration of methylselenocysteine.

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Section: Effects Of Se On Leaf Physiologymentioning

confidence: 99%

mentioning

confidence: 99%

Molecular Mechanisms of Selenium Tolerance and Hyperaccumulation in Stanleya pinnata

Freeman

Tamaoki²,

Stushnoff³

et al. 2010

Plant Physiol.

220

187

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“…Under salt stress an accumulation of Asn (Ashraf and Harris 2004) and Gaba were observed (Bolarín et al 1995) Reactive oxygen species (ROS) are commonly produced in the cell and can act as signals in several transcription pathways, leading to altered patterns of gene expression which allow the plant to adjust adequately to the environment (Dutilleul et al 2003;Foyer and Noctor 2005a;2005b;Gratão et al 2005;Noctor 2006;Mhamdi et al 2010;Queval et al 2011). However, stress can result in an increase in ROS, causing the oxidation of lipids, proteins and DNA, thereby compromising the growth of the plant (Dutilleul et al 2003;Foyer and Noctor 2005a;Gratão et al 2005;Gomes-Júnior et al 2007). Some studies have indicated that Pro may act as a scavenger of ROS (Vicente et al 2004) and can stabilize membranes during salt stress (Hasegawa et al 2000).…”

Section: Introductionmentioning

confidence: 99%

Effect of salt on the growth and metabolism of Glycine max

Queiroz¹,

Sodek

Haddad

2012

Braz. arch. biol. technol.

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“…The nonspecific incorporation of selenoamino acids into proteins is thought to contribute to Se toxicity (Brown and Shrift, 1981). Alternatively, Se toxicity in plants could result from the formation of reactive oxygen species and oxidative stress (Gomes-Junior et al, 2007;Tamaoki et al, 2008).…”

mentioning

confidence: 99%

A Comparison of Sulfate and Selenium Accumulation in Relation to the Expression of Sulfate Transporter Genes in Astragalus Species

et al. 2011

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Sulfate and selenate uptake were investigated in both selenium (Se) hyperaccumulators (Astragalus racemosus and Astragalus bisulcatus) and closely related nonaccumulator species (Astragalus glycyphyllos and Astragalus drummondii). Sulfur (S) starvation increased Se accumulation, whereas increased selenate supply increased sulfate accumulation in both root and shoot tissues. cDNAs for homologs of groups 1 to 4 sulfate transporters were cloned from these Astragalus species to investigate patterns of expression and interactions with sulfate and selenate uptake. In contrast to all other previously analyzed plant species, abundant gene expression of putative sulfate transporters was observed for both Se-hyperaccumulating and nonaccumulating Astragalus, regardless of S and Se status. Furthermore, quantitative analysis of expression indicated a transcript level in Sehyperaccumulating Astragalus comparable with other plant species under S deprivation. The high expression of sulfate transporters in certain Astragalus species may lead to enhanced Se uptake and translocation ability and therefore may contribute to the Se hyperaccumulation trait; however, it is not sufficient to explain S/Se discriminatory mechanisms. Selenium (Se) is an essential element for human and animal health, but excess consumption may also be toxic, and the concentration range from trace element requirement to lethality is narrow (Ohlendorf et al

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Selenium-induced oxidative stress in coffee cell suspension cultures

Cited by 105 publications

References 49 publications

Molecular Mechanisms of Selenium Tolerance and Hyperaccumulation in Stanleya pinnata

Molecular Mechanisms of Selenium Tolerance and Hyperaccumulation in Stanleya pinnata

Effect of salt on the growth and metabolism of Glycine max

A Comparison of Sulfate and Selenium Accumulation in Relation to the Expression of Sulfate Transporter Genes in Astragalus Species

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