Volatile selenium in higher plants the production of dimethyl selenide in cabbage leaves by enzymatic cleavage of Se-methyl selenomethionine selenonium salt

Lewis, B. G.; Johnson, C. M.; Broyer, T. C.

doi:10.1007/bf00011413

Cited by 76 publications

(35 citation statements)

References 27 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Arabidopsis and Indian mustard, which are non-halophytes, SeMM is more likely to be the precursor of DMSe rather than DMSeP. Lewis et al (1974) demonstrated that Se-methyl Se-Met was the source of DMSe production in cabbage (Brassica oleracea) leaves. This idea is supported by the fact that DMSeP was not detected in Se-Met-supplied Indian mustard plants, although they were capable of taking up, assimilating, and volatilizing Se at high rates when supplied with DMSeP (de Souza et al, 2000).…”

mentioning

confidence: 98%

See 1 more Smart Citation

An Essential Role ofS-Adenosyl-l-Methionine:l-MethionineS-Methyltransferase in Selenium Volatilization by Plants. Methylation of Selenomethionine to Selenium-Methyl-l-Selenium- Methionine, the Precursor of Volatile Selenium

2002

View full text Add to dashboard Cite

Selenium (Se) phytovolatilization, the process by which plants metabolize various inorganic or organic species of Se (e.g. selenate, selenite, and Se-methionine [Met]) into gaseous Se forms (e.g. dimethylselenide), is a potentially important means of removing Se from contaminated environments. Before attempting to genetically enhance the efficiency of Se phytovolatilization, it is essential to elucidate the enzymatic pathway involved and to identify its rate-limiting steps. The present research tested the hypothesis that S-adenosyl-l-Met:l-Met S-methyltransferase (MMT) is the enzyme responsible for the methylation of Se-Met to Se-methyl Se-Met (SeMM). To this end, we identified and characterized an Arabidopsis T-DNA mutant knockout for MMT. The lack of MMT in the Arabidopsis T-DNA mutant plant resulted in an almost complete loss in its capacity for Se volatilization. Using chemical complementation with SeMM, the presumed enzymatic product of MMT, we restored the capacity of the MMT mutant to produce volatile Se. Overexpressing MMT from Arabidopsis in Escherichia coli, which is not known to have MMT activity, produced up to 10 times more volatile Se than the untransformed strain when both were supplied with Se-Met. Thus, our results provide in vivo evidence that MMT is the key enzyme catalyzing the methylation of Se-Met to SeMM.The trace element selenium (Se) is an essential micronutrient with important benefits for animal and human nutrition; however, at high doses, Se is toxic (Wilber, 1980; Van Vleet and Ferrans, 1992;Lemly, 1997). Major sources of Se pollution are agricultural drainage from seleniferous soils and industrial wastewater. Se pollution is a worldwide problem and there is a tremendous demand for the cleanup of Se-contaminated soil and water. Phytoremediation, the use of plants to remove, stabilize, or detoxify pollutants, is a highly promising solution to counter the Se problem (Bañ uelos et al., 1995;Salt et al., 1998;Terry and Zayed, 1998).Se volatilization, the process by which gaseous Se forms are produced from inorganic or organic Se compounds (Lewis et al., 1966;Zieve and Peterson, 1984;Duckart et al., 1992;Terry et al., 1992Terry et al., , 2000, is particularly attractive for the phytoremediation of Se-contaminated environments because it completely removes Se from the local food chain (Atkinson et al., 1990;Terry and Zayed, 1998). The major volatile Se form produced by plants and microbes is dimethylselenide (DMSe; Lewis et al., 1974). DMSe is 600 to 700 times less toxic than selenate or selenite, two Se species that are commonly present in polluted areas (McConnell and Portman, 1952;Ganther et al., 1966;Wilber, 1980).The formation of DMSe in many plants is thought to proceed via the sulfur (S) assimilation pathway . To enhance the efficiency of Se volatilization by plants, it is essential that we fully elucidate the biochemical pathway involved in Se assimilation and volatilization. Once we have determined the rate-limiting steps in the pathway, it should be possible to enhance the effic...

show abstract

mentioning

confidence: 98%

“…The major volatile Se form produced by plants and microbes is dimethylselenide (DMSe; Lewis et al, 1974). DMSe is 600 to 700 times less toxic than selenate or selenite, two Se species that are commonly present in polluted areas (McConnell and Portman, 1952;Ganther et al, 1966;Wilber, 1980).…”

mentioning

confidence: 99%

An Essential Role ofS-Adenosyl-l-Methionine:l-MethionineS-Methyltransferase in Selenium Volatilization by Plants. Methylation of Selenomethionine to Selenium-Methyl-l-Selenium- Methionine, the Precursor of Volatile Selenium

2002

View full text Add to dashboard Cite

show abstract

“…A large proportion of the Se removed by the wetland was accumulated in plant tissues and sediments, and it was estimated that 10% to 30% of the removed Se was volatilized. Se volatilization is the process by which inorganic Se is converted to volatile forms (Lewis et al, 1966;Evans et al, 1968;Lewis, 1971;Frankenberger and Karlson, 1994;Terry and Zayed, 1994). Dimethylselenide, the predominant form of volatile Se, is 500 to 700 times less toxic than inorganic forms of Se (McConnell and Portman, 1952;Ganther et al, 1966;Wilber, 1980).…”

mentioning

confidence: 99%

Rhizosphere Bacteria Enhance Selenium Accumulation and Volatilization by Indian Mustard1

Souza¹,

Chu²,

Zhao³

et al. 1999

Plant Physiology

216

View full text Add to dashboard Cite

“…Dimethyl selenide is the principle compound released by microbial and plant respiration (Lewis et al, 1966(Lewis et al, , 1974Francis et al, 1974). Volatile Se was first collected from accumulator and nonaccumulator plants by Lewis et al (1966Lewis et al ( , 1974, and the volatile Se respired by the accumulator A. racemosus was identified as DMSe (Lewis et al, 1974).…”

Section: Selenium Volatilitymentioning

confidence: 99%

Selenium in Seleniferous Environments

Mayland

James

Panter

et al. 2015

Selenium in Agriculture and the Environment

View full text Add to dashboard Cite

Selenium is biologically important because (i) it is essential in animal and possibly plant metabolism, (ii) in many areas diets do not contain sufficient Se to meet, animals' needs, and (iii) in other areas it is toxic to animals when it occurrs in high concentrations in soil, water, plants, fly ash, or in aerosols. Animals require 0.05 to 0.1 mg Se/kg in their diets to prevent Se deficiency but suffer Se toxicosis when dietary levels exceed 5 to 15 mg Se/kg. The earth's crustal materials generally contain <0.1 mg Se/kg. Higher concentrations are found in Cretaceous shales. The Seaccumulator plants growing on the seleniferous soils may contain hundreds or even thousands of mg Se/kg. However, the nonaccumulator grasses and forbs seldom accumulate >50 mg Se/kg and more often contain <5 mg Se/kg. Soils and plants may discharge volatile forms of Se into the atmosphere. However, plants may also absorb measurable amounts of gaseous Se from the atmosphere. Anthropogenic activities impact the amount of Se entering our nation's lakes, rivers, and the atmosphere. Combustion of coal and incineration of municipal waste exhaust Se into the environment. In addition, crop-fallow and irrigation practices that allow leaching waters to pass through seleniferous strata prior to intersecting with surface flow, augment the Se levels encountered by plant and animal life.In 1857, U.S. Army Surgeon T.W. Madison described toxicity symptoms in horses (Equus caballus) grazing near Fort Randall, SD (Rosenfeld & Beath, 1964). Since then, ranchers in that area have continued to experience livestock losses. They associated the toxicosis with the saline seeps and outcrops, com-

show abstract

Volatile selenium in higher plants the production of dimethyl selenide in cabbage leaves by enzymatic cleavage of Se-methyl selenomethionine selenonium salt

Abstract: The volatile selenium compound produced by cabbage (Brassica oleracea vat. Capitata) when cultured on media containing either selenite or selenate is dimethyl selenide, (CH3)2 Se. The dimetbyl selenide arises from enzymatic cleavage of a Se-methyl selenomethionine selenonium compound.

Cited by 76 publications

References 27 publications

An Essential Role ofS-Adenosyl-l-Methionine:l-MethionineS-Methyltransferase in Selenium Volatilization by Plants. Methylation of Selenomethionine to Selenium-Methyl-l-Selenium- Methionine, the Precursor of Volatile Selenium

An Essential Role ofS-Adenosyl-l-Methionine:l-MethionineS-Methyltransferase in Selenium Volatilization by Plants. Methylation of Selenomethionine to Selenium-Methyl-l-Selenium- Methionine, the Precursor of Volatile Selenium

Rhizosphere Bacteria Enhance Selenium Accumulation and Volatilization by Indian Mustard1

Selenium in Seleniferous Environments

Contact Info

Product

Resources

About