Production of dimethylselenide gas from inorganic selenium by eleven soil fungi

Barkes, Lloyd; Fleming, R. W.

doi:10.1007/bf01709124

Cited by 67 publications

(17 citation statements)

References 6 publications

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“…Assimilatory reduction can also occur, and several bacteria, archaea, and yeast are known to reduce

{SeO}_{3}^{2 -}

{SeO}_{4}^{2 -}

to organic Se(‐II) through Se amino acid production (Stolz, Basu, Santini, & Oremland, ; Xu et al., ). Aerobic Se(IV,VI) reduction has also been demonstrated by a number of micro‐organisms, generally as a means for detoxification, although it is substantially less studied (Barkes & Fleming, ; Bebien, Chauvin, Adriano, Grosse, & Verméglio, ; Challenger, Lisle, & Dransfield, ; Gharieb, Wilkinson, & Gadd, ; Kessi & Hanselmann, ; Schilling, Johnson, & Wilcke, ), and most publications have focused on bacterial, rather than fungal, processes. Many fungi have known metal(loid) tolerances (Gadd, ; Santelli, Chaput, & Hansel, ; Santelli et al., ; Wainwright & Gadd, ), with metal(loid) contamination often altering environmental microbial communities, in favor of fungi (Fliessbach, Martens, & Reber, ; Rajapaksha, Tobor‐Kapłon, & Bååth, ).…”

Section: Introductionmentioning

confidence: 99%

Selenium (IV,VI) reduction and tolerance by fungi in an oxic environment

et al. 2017

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Microbial processes are known to mediate selenium (Se) oxidation-reduction reactions, strongly influencing Se speciation, bioavailability, and transport throughout the environment. While these processes have commonly been studied in anaerobic bacteria, the role that aerobic fungi play in Se redox reactions could be important for Se-rich soil systems, dominated by microbial activity. We quantified fungal growth, aerobic Se(IV, VI) reduction, and Se immobilization and volatilization in the presence of six, metal-tolerant Ascomycete fungi. We found that the removal of dissolved Se was dependent on the fungal species, Se form (i.e., selenite or selenate), and Se concentration. All six species grew and removed dissolved Se(IV) or Se(VI) from solution, with five species reducing both oxyanions to Se(0) biominerals, and all six species removing at least 15%-20% of the supplied Se via volatilization. Growth rates of all fungi, however, decreased with increasing Se(IV,VI) concentrations. All fungi removed 85%-93% of the dissolved Se(IV) within 10 d in the presence of 0.01 mm Se(IV), although only about 20%-30% Se(VI) was removed when grown with 0.01 mm Se(VI). Fungi-produced biominerals were typically 50- to 300-nm-diameter amorphous or paracrystalline spherical Se(0) nanoparticles. Our results demonstrate that activity of common soil fungi can influence Se form and distribution, and these organisms may therefore play a role in detoxifying Se-polluted environments.

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“…Assimilatory reduction can also occur, and several bacteria, archaea, and yeast are known to reduce

{SeO}_{3}^{2 -}

{SeO}_{4}^{2 -}

Section: Introductionmentioning

confidence: 99%

Selenium (IV,VI) reduction and tolerance by fungi in an oxic environment

et al. 2017

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“…The reduction of selenite to Se 0 and volatile selenides has been attributed to diverse fungal populations in a variety of soil and mineral environments (Barkes and Fleming 1974;Karlson and Frankenberger 1989;Larsen et al 2006;Peitzsch et al 2010), and is associated with high selenium tolerance in several isolates (Falcone and Nickerson 1963;Gadd 1998, 2004a;Gobulev and Gobulev 2002). Thus, selenite reduction by fungal species is a widespread and ecologically significant phenomenon.…”

Section: Introductionmentioning

confidence: 98%

Characterization and Distribution of Selenite Reduction Products in Cultures of the Marine YeastRhodotorula mucilaginosa-13B

Ruocco

Chan

Hanson

et al. 2014

Geomicrobiology Journal

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Selenite reduction by fungi is a widespread and ecologically significant phenomenon, but previous studies of fungal isolates have not fully characterized the reduction products. We investigated selenite reduction and the distribution of Se in cultures of the marine yeast Rhodotorula mucilaginosa-13B. Strain 13B reduced a substantial amount of selenite to form amorphous elemental selenium particles. Minor volatilization was also observed. Under the aerobic experimental conditions, intact 13B cultures were required for substantial distribution to the solid and volatile phases. This is the first study to report comprehensive microscopic image data and spectroscopic analyses confirming the accumulation of amorphous Se 0 particles external and internal to cells of a Rhodotorula strain.

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“…There has been some research on the metabolism of Se in filamentous fungi, including uptake and volatilization (Barkes and Fleming 1974;Fleming and Alexander 1972;Gharieb et al 1995;Tweedie and Segel 1970;Ramadan et al 1988); however, the information is still scarce. The limited knowledge regarding Se-fungi interactions hampers the full exploitation of fungi in Se remediation technologies and as nSe 0 producing agents.…”

Section: Introductionmentioning

confidence: 99%

Effects of selenium oxyanions on the white-rot fungus Phanerochaete chrysosporium

Espinosa-Ortiz

Gonzalez-Gil

Saikaly

et al. 2014

Appl Microbiol Biotechnol

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The ability of Phanerochaete chrysosporium to reduce the oxidized forms of selenium, selenate and selenite, and their effects on the growth, substrate consumption rate, and pellet morphology of the fungus were assessed. The effect of different operational parameters (pH, glucose, and selenium concentration) on the response of P. chrysosporium to selenium oxyanions was explored as well. This fungal species showed a high sensitivity to selenium, particularly selenite, which inhibited the fungal growth and substrate consumption when supplied at 10 mg L(-1) in the growth medium, whereas selenate did not have such a strong influence on the fungus. Biological removal of selenite was achieved under semi-acidic conditions (pH 4.5) with about 40 % removal efficiency, whereas less than 10 % selenium removal was achieved for incubations with selenate. P. chrysosporium was found to be a selenium-reducing organism, capable of synthesizing elemental selenium from selenite but not from selenate. Analysis with transmission electron microscopy, electron energy loss spectroscopy, and a 3D reconstruction showed that elemental selenium was produced intracellularly as nanoparticles in the range of 30-400 nm. Furthermore, selenite influenced the pellet morphology of P. chrysosporium by reducing the size of the fungal pellets and inducing their compaction and smoothness.

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Production of dimethylselenide gas from inorganic selenium by eleven soil fungi

Cited by 67 publications

References 6 publications

Selenium (IV,VI) reduction and tolerance by fungi in an oxic environment

Selenium (IV,VI) reduction and tolerance by fungi in an oxic environment

Characterization and Distribution of Selenite Reduction Products in Cultures of the Marine YeastRhodotorula mucilaginosa-13B

Effects of selenium oxyanions on the white-rot fungus Phanerochaete chrysosporium

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