A Novel Selenocystine-Accumulating Plant in Selenium-Mine Drainage Area in Enshi, China

Yuan, Linxi; Zhu, Yongchun; Lin, Zhi-Qing; Bañuelos, Gary S.; Li, Wei; Yin, Xuebin

doi:10.1371/journal.pone.0065615

Cited by 90 publications

(68 citation statements)

References 52 publications

(56 reference statements)

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“…Analysis of Se speciation was performed according to the method by Bañuelos et al (2011) and Yuan et al (2013). The whole shoots were extracted with 100 mM Tris-HCl buffer (pH 7.5) in an ultrasonic tank for 10 min and then enzyme Protease XIV was then added to shake for 24 h at 37°C.…”

Section: Methodsmentioning

confidence: 99%

Indications of Selenium Protection against Cadmium and Lead Toxicity in Oilseed Rape (Brassica napus L.)

Yin

Bañuelos

et al. 2016

Front. Plant Sci.

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The present study investigated the beneficial role of selenium (Se) in protecting oilseed rape (Brassica napus L.) plants from cadmium (Cd+2) and lead (Pb+2) toxicity. Exogenous Se markedly reduced Cd and Pb concentration in both roots and shoots. Supplementation of the medium with Se (5, 10, and 15 mg kg-1) alleviated the negative effect of Cd and Pb on growth and led to a decrease in oxidative damages caused by Cd and Pb. Furthermore, Se-enhanced superoxide free radicals (O2true•¯), hydrogen peroxide (H2O2), and lipid peroxidation, as indicated by malondialdehyde accumulation, but decreased superoxide dismutase and glutathione peroxidase activities. Meanwhile, the presence of Cd and Pb in the medium affected Se speciation in shoots. The results suggest that Se could alleviate Cd and Pb toxicity by preventing oxidative stress in oilseed rape plant.

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Section: Methodsmentioning

confidence: 99%

Indications of Selenium Protection against Cadmium and Lead Toxicity in Oilseed Rape (Brassica napus L.)

Yin

Bañuelos

et al. 2016

Front. Plant Sci.

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“…Apparently, absorbed selenate induced diverse enzymatic activities because the data indicated by several unknown species appearing exclusively after selenate application (Table 6). Surprisingly, Yuan et al (2013) revealed SeCys2 (possibly SeCys2 + SeCys) as the predominant species in Cardamine sp. (a novel Se-hyperaccumulator) grown in a Se mining area, which contradicts the current conception of plant Se metabolism along with the defense mechanism against substantial SeCys build-up in a cell.…”

Section: Uptake Of Selenium and Other Macro-and Microelements By Plantsmentioning

confidence: 97%

The response of broccoli (Brassica oleraceaconvar.italica) varieties on foliar application of selenium: uptake, translocation, and speciation

Šindelářová

Száková

Tremlová

et al. 2015

Food Additives & Contaminants: Part A

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A model small-scale field experiment was set up to investigate selenium (Se) uptake by four different varieties of broccoli plants, as well as the effect of Se foliar application on the uptake of essential elements for plants calcium (Ca), copper (Cu), iron (Fe), potassium (K), magnesium (Mg), manganese (Mn), phosphorus (P), sulfur (S), and zinc (Zn). Foliar application of sodium selenate (Na2SeO4) was carried out at two rates (25 and 50 g Se/ha), and an untreated control variant was included. Analyses of individual parts of broccoli were performed, whereby it was found that Se in the plant accumulates mainly in the flower heads and slightly less in the leaves, stems, and roots, regardless of the Se rate and broccoli variety. In most cases, there was a statistically significant increase of Se content in all parts of the plant, while there was no confirmed systematic influence of the addition of Se on the changing intake of other monitored elements. Selenization of broccoli leads to an effective increase in the Se content at a rate of 25 g/ha, whereas the higher rate did not result in a substantial increase of Se content compared to the lower rate in all varieties. Therefore, the rate of 25 g/ha can be recommended as effective to produce broccoli with an increased Se content suitable for consumption. Moreover, Se application resulted in an adequate increase of the main organic compounds of Se, such as selenocystine (SeCys2), selenomethionine (SeMet), and Se-methylselenocysteine (Se-MeSeCys).

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“…Only SeCys 2 was detected in mature seeds, up to 1081 mg/kg as Se. A research of Yuan et al (2013) also indicated that over 70% of the total accumulated Se was in the form of selenocystine (SeCys 2 ) in Se-enriched Cardamine hupingshanesis (Brassicaceae). While inorganic Se is dominant during early growth period, with concentrations of 6.6 mg/kg of Se (IV) and 386.7 mg/kg of Se (VI) in seedling frond, and 3.7 mg/kg of Se (IV) and 87.2 mg/kg of Se (VI) in half mature frond.…”

Section: Se Species Distribution In Cardamine Spmentioning

confidence: 99%

“…In this plant the Se-concentration reached 1427 mg/kg (Shao et al, 2007). Later Yuan (2013) also discovered a novel Se secondary accumulator (Cardamine hupingshanesis) in the same area.…”

Section: Introductionmentioning

confidence: 99%

Accumulation and speciation of selenium in Cardamine sp. in Yutangba Se Mining Field, Enshi, China

Shao

Deng

et al. 2014

Chin. J. Geochem.

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A naturally selenium-accumulating Cardamine sp. is growing in Yutangba Selenium Mining Field, Enshi area, Hubei Province, China, where the geochemical environment is selenium-enriched and endemic selenosis ever occurred in humans. The present study investigated the characteristics of accumulation, speciation and quantity of selenium in Cardamine sp. with HPLC-ICP-MS. Results show that Cardamine sp. can accumulate Se at most 1427 mg/kg in seedling leaves. Even after the biomass incensement of growing up, the plant still could accumulate Se up to several hundred of mg/kg in concentration. Moreover, the biomass enrichment coefficient (BEC) of Se is exceedingly high, in the seedling leaves mostly, higher than 50 mg/kg; in the range of 43.7-68 mg/kg; and the lowest value is higher than 3 mg/kg in mature fronds. Se is present in the plant predominantly in form of SeCys 2 with the highest concentration in seeds; up to 1081 mg/kg as Se. In contrast, SeCys 2 levels are low during early growth period; they are 136.1 mg/kg as Se in seedling fronds and 39.4 mg/kg as Se in mature fronds, respectively. SeMet concentration is comparatively low; 10.6 mg/kg as Se in seedling frond and 5.3 mg/kg as Se in half mature fronds, respectively. This indicates that Cardamine sp. is extremely efficient in extracting Se from soil and translocating it into its above-ground biomass. Therefore, Cardamine sp., found in Yutangba Se Mining Field may be a new Se hyperaccumulator. It is still uncertain whether the Se-accumulation or detoxification of Cardamine sp. happens through the pathway of SeCys methylated to form Se-methylselenoCys or through the formation of Se-carboxymethyl-selenohomocysteine. Indeed, further study should be carried out on the determination of more Se species to explain the high Se hyperaccumulation in Cardamine sp.

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A Novel Selenocystine-Accumulating Plant in Selenium-Mine Drainage Area in Enshi, China

Cited by 90 publications

References 52 publications

Indications of Selenium Protection against Cadmium and Lead Toxicity in Oilseed Rape (Brassica napus L.)

Indications of Selenium Protection against Cadmium and Lead Toxicity in Oilseed Rape (Brassica napus L.)

The response of broccoli (Brassica oleraceaconvar.italica) varieties on foliar application of selenium: uptake, translocation, and speciation

Accumulation and speciation of selenium in Cardamine sp. in Yutangba Se Mining Field, Enshi, China

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