Radicular and foliar uptake, and xylem- and phloem-mediated transport of selenium in maize (Zea mays L.): a comparison of five Se exogenous species

Wang, Mengke; Dinh, Quang Toan; Qi, Mingxing; Wang, Min; Yang, Wenxiao; Zhou, Fei; Liang, Dongli

doi:10.1007/s11104-019-04346-w

Cited by 31 publications

(13 citation statements)

References 57 publications

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“…We found a very high accumulation of this element in the root tissues in the presence of Se(IV), which is consistent with the results of other studies [ 28 , 40 , 45 ]. In roots, Se(IV) can be rapidly converted to organic Se (e.g., selenomethionine, selenomethionine Se-oxide, Se-methyl-selenocysteine, and several unidentified Se forms), with restricted translocation to shoots and toxic effects on root cell metabolism [ 46 ].…”

Section: Discussionsupporting

confidence: 93%

Difference between Selenite and Selenate in the Regulation of Growth and Physiological Parameters of Nickel-Exposed Lettuce

Hawrylak-Nowak

Matraszek-Gawron

2020

Biology

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Nickel is an essential plant micronutrient; however, even at low concentrations, it may be phytotoxic. Selenium is a beneficial element with an alleviating effect that has been confirmed in the case of many abiotic stresses, including metal toxicity. The aim of this study is to assess the effect of two forms of Se (Se(IV) or Se(VI)) on the phytotoxicity, accumulation, and translocation of Ni in lettuce. Nickel causes a reduction in lettuce growth and vitality of roots, probably through increased lipid peroxidation. The application of Se(IV) to a Ni-contaminated medium resulted in a further reduction of growth, especially in the presence of 6 µM Se(IV). The growth-promoting effect of Se was found only in the 2 µM Se(VI)/10 µM Ni treatment. The application of 6 µM Se, regardless of the Se form, to the Ni-containing substrate caused an increase in shoot Ni concentration. In turn, a decrease in root Ni content was found for all Se treatments. The strong aggravation of Ni phytotoxicity in the presence of 6 µM Se(IV) was most likely related to the accumulation of high Se concentration in the roots, and the combination of high root Ni accumulation caused irreversible dysregulation of cell metabolism.

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Section: Discussionsupporting

confidence: 93%

Difference between Selenite and Selenate in the Regulation of Growth and Physiological Parameters of Nickel-Exposed Lettuce

Hawrylak-Nowak

Matraszek-Gawron

2020

Biology

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“…On day 30, plum leaf Se increased slowly at 5.64 mg kg −1 in Se 6+ group and reduced 0.27 mg kg −1 in Se 2− treatment. Our result was similar to our previous study, in which we found that leaf Se content following Se 6+ treatment was significantly higher than in Se 2− treatment of young wild peach seedlings (Sun et al 2020), while Wang et al (2019) reported that maize can accumulate much more Se supplied in Se 2− (SeMet) compared with that in Se 6+ . Differences in transport and distribution mechanisms between plant species could explain the differences between the studies.…”

Section: Growth and Se Concentrationsupporting

confidence: 92%

Effects of Selenium on Serotonin Synthesis and the Glutathione Redox Cycle in Plum Leaves

Sun

Han

et al. 2020

J Soil Sci Plant Nutr

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Selenium (Se), an essential micronutrient for humans, is also a beneficial nutrient for growth and development of many plants. The aim of the present study was to determine whether low-dose Se application could increase plum growth and serotonin synthesis, as well as upregulate the glutathione redox cycle. Two-year-old plum trees were treated with Se 6+ (Na 2 SeO 4) and Se 2− (SeMet). Growth parameters, levels of serotonin synthesis precursors, compounds and enzymes of the glutathione (GSH) redox cycle, and the antioxidant capacity were analyzed. Results showed that plant height and stem diameter were increased by Se treatment. The leaf Se content was significantly increased; tryptophan was not affected by Se treatment, while the 5hydroxytryptophan content was significantly higher than control. Although serotonin levels were also increased, the effect was not significant, and no tryptamine was detected in our study. On the 30th day, the MDA content in Se 2− was highest followed by the control and Se 6+ treatment, and the activities of T-AOT and CAT were increased, while GST was reduced by Se treatment. The two forms of Se treatments increased the activity of GPX and GR, and the total content of GSH + glutathione disulfide (GSSG) at the end of treatment. Furthermore, the level of GSH and GSH/GSSG was instable changed. GSSG content was similar during the treatment time except on the 20 days. Conclusively, the pathway of plum serotonin was clear, both Se 6+ and Se 2− could influence the serotonin synthesis. Additionally, the GSH redox cycle was sensitive to the Se application. Moreover, Se 6+ performed better than Se 2− on leaf Se content, plant growth parameters, and antioxidant capacity.

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“…In the present study, we found that rice are characterized by a higher uptake potential ( V max ) for organic Se than for inorganic forms, showing a descending order of SeMet > SeOMet > selenite > selenate ( Figure 1 and Table 1 ). Similarly, Wang M. K. et al (2020) demonstrated that the roots of maize ( Zea mays L.) had a higher uptake of organic Se (SeMet, MeSeCys, and SeCys) than inorganic Se (selenite and selenate) when supplied with 0.01 or 1 mg⋅L –1 Se. Consistently, Kikkert and Berkelaar (2013) found that the rate of SeMet uptake by the wheat roots was considerably higher than that of either selenite or selenate and conjectured that this difference could be attributable to the differences in the activities of their respective transporters.…”

Section: Discussionmentioning

confidence: 95%

“…Furthermore, the findings of our specific inhibitor treatments indicate that SeMet and SeOMet are taken up into rice roots via different channels. Among the other inhibitors we studied, AgNO 3 is a potential inhibitor of aquaporins of plant origin and partially inhibit the uptake of selenite ( Zhang et al, 2006 ) and Nano-Se ( Wang M. K. et al, 2020 ). The mechanism of its inhibit function is that silver reacts with the sulfhydryl group of a cysteine and also with a histidine, thereby resulting in a gating of the targeted aquaporins ( Niemietz and Tyerman, 2002 ).…”

Section: Discussionmentioning

confidence: 99%

“…SeMet can be incorporated into proteins either directly or non-specifically via the replacement of methionine and is thereby readily absorbed by humans ( Fairweather-Tait et al, 2010 ). Moreover, the uptake rate of SeMet by plants is higher than that of either selenite or selenate ( Kowalska et al, 2020 ; Wang M. K. et al, 2020 ). Selenomethionine-oxide (SeOMet) is a derivative obtained from the transformation of SeMet.…”

Section: Introductionmentioning

confidence: 99%

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Uptake and translocation mechanisms of different forms of organic selenium in rice (Oryza sativa L.)

et al. 2022

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Selenium (Se) is an essential trace element for human and animal health, and toward an understanding of the uptake and translocation of Se in plants is important from the perspective of Se biofortification. In this study, we conducted hydroponic experiments to investigate the mechanisms of organic Se [selenomethionine (SeMet) and selenomethionine-oxide (SeOMet)] uptake, translocation, and the interactions between SeMet and SeOMet in rice. We also investigated differences in the dynamics of organic and inorganic Se uptake by rice roots. Concentration-dependent kinetic results revealed that SeMet uptake during a 1 h exposure was 3.19–16.0 times higher than that of three other Se chemical forms, with uptake capacity (Vmax) values ordered as follows: SeMet>SeOMet>selenite>selenate. Furthermore, time-dependent kinetic analysis revealed that SeMet uptake by roots and content in shoots were initially clearly higher than those of SeOMet, although the differences gradually diminished with prolonged exposure time; while no significant difference was found in the transfer factor of Se from rice roots to shoots between SeMet and SeOMet. Root uptake of SeOMet was significantly inhibited by carbonyl cyanide 3-chlorophenylhydrazone (CCCP) (30.4%), AgNO3 (41.8%), and tetraethylammonium chloride (TEACl) (45.6%), indicating that SeOMet uptake is a metabolically active process, and that it could be mediated via aquaporins and K+ channels. Contrarily, SeMet uptake was insensitive to CCCP, although markedly inhibited by AgNO3 (93.1%), indicating that rice absorbs SeMet primarily via aquaporins. Furthermore, Se uptake and translocation in rice treated simultaneously with both SeMet and SeOMet were considerably lower than those in rice treated with SeMet treatment alone and notably lower than the theoretical quantity, indicating interactions between SeMet and SeOMet. Our findings provide important insights into the mechanisms underlying the uptake and translocation of organic Se within plants.

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Radicular and foliar uptake, and xylem- and phloem-mediated transport of selenium in maize (Zea mays L.): a comparison of five Se exogenous species

Cited by 31 publications

References 57 publications

Difference between Selenite and Selenate in the Regulation of Growth and Physiological Parameters of Nickel-Exposed Lettuce

Difference between Selenite and Selenate in the Regulation of Growth and Physiological Parameters of Nickel-Exposed Lettuce

Effects of Selenium on Serotonin Synthesis and the Glutathione Redox Cycle in Plum Leaves

Uptake and translocation mechanisms of different forms of organic selenium in rice (Oryza sativa L.)

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