Selenium Speciation in Soils and Plants

Fox, Patricia; LeDuc, Danika L.; Hussein, Hadeel Majid; Lin, Zhi-Qing; Terry, Norman; Cai, Yankun; Braids, O. C.

doi:10.1021/bk-2003-0835.ch022

Cited by 12 publications

(5 citation statements)

References 91 publications

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“…Contrarily, selenate enters root cells via high-affinity sulfate transporters in the plasma membrane [15,16], and are easily transported from roots to shoots through the xylem, with a relatively small proportion assimilated to organic forms [18,20]. Under certain environmental conditions, these two Se species may exist in the rhizosphere [21]; however, elemental Se, which constitutes 26-66% of total Se reserves can also be found in soil environments [22], and its absorption mechanism and assimilation process within plants has not been clarified.…”

Section: Introductionmentioning

confidence: 99%

Uptake, translocation and biotransformation of selenium nanoparticles in rice seedlings (Oryza sativa L.)

Wang¹,

Wang²,

Li³

et al. 2020

J Nanobiotechnol

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Background: Selenium (Se) in soil mainly consists of selenite, selenate, and elemental Se. However, little is known about the mechanism involved in the uptake and biotransformation of elemental Se by plants. Results: In this study, the uptake, translocation, subcellular distribution and biotransformation of selenium nanoparticles (SeNPs) in rice (Oryza sativa L.), and a comparison with selenite and selenate, were investigated through hydroponic experiments. The study revealed that SeNPs could be absorbed by rice plants; and aquaporin inhibitor was responsible for a 60.4% inhibition of SeNP influx, while metabolic inhibitor was ineffective. However, the SeNPs uptake rate of rice roots was approximately 1.7 times slower than that of selenite or selenate. Under the SeNPs or selenite treatment, Se was primarily accumulated in roots rather than in shoots, whereas an opposite trend was observed with selenate treatment. Additionally, most of the absorbed Se was distributed in cell wall of the SeNPs or selenite treatedrice plants, while its proportion was the highest in soluble cytosol of the selenate treated-rice plants. The absorbed SeNPs or selenite was rapidly assimilated to organic forms, with SeMet being the most predominant species in both shoots and roots of the rice plants. However, following selenate treatment, Se(VI) remained as the most predominant species, and only a small amount of it was converted to organic forms. Conclusion: Therefore, this study provides a deeper understanding of the mechanisms associated SeNPs uptake and biotransformation within plants.

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Section: Introductionmentioning

confidence: 99%

Uptake, translocation and biotransformation of selenium nanoparticles in rice seedlings (Oryza sativa L.)

Wang¹,

Wang²,

Li³

et al. 2020

J Nanobiotechnol

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show abstract

“…Selenium is a metalloid element that occurs in different forms, including as selenide [Se (-II)], elemental selenium [Se (0)], selenite [Se (IV)], and selenate [Se (VI)], all of these organic or inorganic Se compounds occur naturally in the environment and accumulates in many organisms (Dissanayake and Chandrajith, 2009 ). Elemental selenium is one of the dominant Se species in both aerobic and anaerobic soils which contribute 26–66% of the total Se in soil (Fox et al, 2000 ). Under oxidizing conditions (>300 mV) and moderately reducing conditions (0–200 mV) selenate and selenite will be the most dominant species in soil, respectively (Zhang and Moore, 1996 ; Martens and Suarez, 1997 ; Gao et al, 2000 ).…”

Section: Introductionmentioning

confidence: 99%

Absorption and Bio-Transformation of Selenium Nanoparticles by Wheat Seedlings (Triticum aestivum L.)

et al. 2018

Front. Plant Sci.

117

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Elemental selenium is one of the dominant selenium species in soil, but the mechanism of its uptake by plants is still unclear. In this study, nanoparticles of elemental selenium (SeNPs) with different sizes were prepared, and their uptake and transformation in wheat (Triticum aestivum L.) were analyzed in hydroponic experiments by HPLC-ICP-MS. We found that the SeNPs can be absorbed by wheat seedlings, and the process is energy independent. The addition of aquaporins inhibitor caused 92.5 and 93.4% inhibition of chemosynthesized SeNPs (CheSeNPs) and biosynthesized SeNPs (BioSeNPs) absorption by wheat roots, respectively. The 40 nm SeNPs uptake by wheat roots was 1.8-fold and 2.2-fold higher than that of 140 and 240 nm, respectively. The rate of SeNPs uptake in wheat was much slower than that of selenite [Se (IV)], and CheSeNPs were more efficiently absorbed than BioSeNPs. The SeNPs were rapidly oxidized to Se (IV) and converted to organic forms [selenocystine (SeCys2), se-methyl-selenocysteine (MeSeCys), and selenomethionine (SeMet)] after they were absorbed by wheat roots. Additionally, we demonstrated that the aquaporin function in some way is related to the absorption of SeNPs. The particle size and synthesis method of the SeNPs affected their uptake rates by plants. Taken together, our results provide a deep understanding of the SeNPs uptake mechanism in plants.

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“…Elemental selenium is one of the main selenium species in aerobic and anaerobic soil, making up 26–66% of the total selenium in soil ( 73 ). Gray Selenium and Black Selenium are not biologically active, possibly due to their insolubility, while Red SeNPs have scavenging effects on various free radicals ( 74 , 75 ).…”

Section: Effect and Mechanism Of Selenium Nanoparticles On Cropsmentioning

confidence: 99%

Recent research progress on the synthesis and biological effects of selenium nanoparticles

Zhang

et al. 2023

Front. Nutr.

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Selenium is an essential trace element for the human body, with the chemical and physical characteristics of both metals and nonmetals. Selenium has bioactivities related to the immune system, antioxidation, anti-virus, and anti-cancer. At the same time, it also plays a role in reducing and alleviating the toxicity of heavy metals. Compared with inorganic selenium, organic selenium is less toxic and has greater bioavailability. Selenium nanoparticles (SeNPs) have the advantages of high absorption rate, high biological activity, and low toxicity, and can be directly absorbed by the human body and converted to organic selenium. Selenium nanoparticles have gradually replaced the traditional selenium supplement and has broad prospects in the food and medical industries. In this paper, the chemical, physical, and biological methods for the synthesis of selenium nanoparticles are reviewed, and the microbial synthesis methods of selenium nanoparticles, the effects of selenium nanoparticles on crop growth, and the antibacterial, antioxidant, anticancer, and anti-tumor effects of selenium nanoparticles are also systematically summarized. In addition, we evaluate the application of selenium nanoparticles in selenium nutrition enhancement, providing support for the application of selenium nanoparticles in animals, plants, and humans.

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Selenium Speciation in Soils and Plants

Cited by 12 publications

References 91 publications

Uptake, translocation and biotransformation of selenium nanoparticles in rice seedlings (Oryza sativa L.)

Uptake, translocation and biotransformation of selenium nanoparticles in rice seedlings (Oryza sativa L.)

Absorption and Bio-Transformation of Selenium Nanoparticles by Wheat Seedlings (Triticum aestivum L.)

Recent research progress on the synthesis and biological effects of selenium nanoparticles

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