Mechanisms underlying mercury detoxification in soil–plant systems after selenium application: a review

Tran, Thi Anh Thu; Dinh, Quang Toan; Zhou, Fei; Zhai, Hua‐Jin; Xue, Mingyue; Du, Zekun; Bañuelos, Gary S.; Liang, Dongli

doi:10.1007/s11356-021-15048-1

Cited by 25 publications

(12 citation statements)

References 212 publications

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“…Selenium is generally beneficial for plants in appropriate concentrations and has been found to influence photosynthesis (Jiang et al, 2017 ), root architecture (Zhao et al, 2019 ), senescence (Hajiboland et al, 2019 ), vegetable quality (Mckenzie et al, 2019 ), defense, and stress response (Alves et al, 2020 ; Wen, 2021 ). With the interest in the roles of selenium in plants, reports of selenium have dramatically increased in recent years and it is anticipated that mechanism studies related to plant selenium will flourish in the near future (Wrobel et al, 2020 ; Tran et al, 2021 ; Wen, 2021 ).…”

Section: Introductionmentioning

confidence: 99%

Melatonin Participates in Selenium-Enhanced Cold Tolerance of Cucumber Seedlings

et al. 2021

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Melatonin is an important and widespread plant hormone. However, the underlying physiological and molecular mechanisms of melatonin as a secondary messenger in improving cold tolerance by selenium are limited. This study investigated the effects of selenite on the cold stress of cucumber seedlings. The results showed that exogenous application of selenite improved the cold tolerance of cucumber seedlings, which was dependent on the concentration effect. In the present experiment, 1 μM of selenite showed the best effect on alleviating cold stress. Interestingly, we found that in the process of alleviating cold stress, selenite increased the content of endogenous melatonin by regulating the expression of melatonin biosynthesis genes (TDC, T5H, SNAT, and COMT). To determine the interrelation between selenite and melatonin in alleviating cold stress, melatonin synthesis inhibitor p-chlorophenylalanine and melatonin were used for in-depth study. This study provides a theoretical basis for cucumber cultivation and breeding.

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Section: Introductionmentioning

confidence: 99%

Melatonin Participates in Selenium-Enhanced Cold Tolerance of Cucumber Seedlings

et al. 2021

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“…This has been reported to occur in several hyperaccumulators such as Thlaspi caerulescens and Arabidopsis halleri [84,85]. The presence of Se in the soil might lead to the formation of HgSe insoluble complexes in the rhizosphere and/or the roots that immobilize Hg and inhibit both uptake and translocation [86,87]. Thiols and phenolics concentrations have been reported to increase in L. albus cv.…”

Section: Discussionmentioning

confidence: 99%

Nodulated White Lupin Plants Growing in Contaminated Soils Accumulate Unusually High Mercury Concentrations in Their Nodules, Roots and Especially Cluster Roots

et al. 2021

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Two white lupin (Lupinus albus L.) cultivars were tested for their capacity to accumulate mercury when grown in Hg-contaminated soils. Plants inoculated with a Bradyrhizobium canariense Hg-tolerant strain or non-inoculated were grown in two highly Hg-contaminated soils. All plants were nodulated and presented a large number of cluster roots. They accumulated up to 600 μg Hg g−1 DW in nodules, 1400 μg Hg g−1 DW in roots and 2550 μg Hg g−1 DW in cluster roots. Soil, and not cultivar or inoculation, was accountable for statistically significant differences. No Hg translocation to leaves or seeds took place. Inoculated L. albus cv. G1 plants were grown hydroponically under cluster root-promoting conditions in the presence of Hg. They accumulated about 500 μg Hg g−1 DW in nodules and roots and up to 1300 μg Hg g−1 DW in cluster roots. No translocation to the aerial parts occurred. Bioaccumulation factors were also extremely high, especially in soils and particularly in cluster roots. To our knowledge, Hg accumulation in cluster roots has not been reported to date. Our results suggest that inoculated white lupin might represent a powerful phytoremediation tool through rhizosequestration of Hg in contaminated soils. Potential uptake and immobilization mechanisms are discussed.

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“…Heavy metal toxicity can inhibit photosynthesis by triggering the degradation of chlorophyll molecules by enhancing chlorophyllase activity and replacing the central Mg + in the porphyrin ring, affecting overall plant growth and yield [ 120 ]. However, Se significantly enhances chlorophyll a, chlorophyll b, and total chlorophyll contents in plants under heavy metal stress, thereby facilitating photosynthesis [ 74 , 121 ]. Se also helps rebuild damaged cell membranes, chloroplast structures, and photosynthetic system components in plants [ 102 , 122 , 123 , 124 ].…”

Section: Se and Stresses In Plantsmentioning

confidence: 99%

“…Moreover, Se interacts with heavy metals. Thus, Se application leads to the formation of inert HgSe or/and HgSe-containing proteinaceous complexes in the rhizosphere [ 121 ]. For instance, Se forms insoluble HgSe precipitates with Hg in the roots, thus reducing the mobility and availability of Hg [ 129 ].…”

Section: Se and Stresses In Plantsmentioning

confidence: 99%

Selenium Regulates Antioxidant, Photosynthesis, and Cell Permeability in Plants under Various Abiotic Stresses: A Review

Liu

Xiao

Qiu

et al. 2022

Plants

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Plant growth is affected by various abiotic stresses, including water, temperature, light, salt, and heavy metals. Selenium (Se) is not an essential nutrient for plants but plays important roles in alleviating the abiotic stresses suffered by plants. This article summarizes the Se uptake and metabolic processes in plants and the functions of Se in response to water, temperature, light, salt, and heavy metal stresses in plants. Se promotes the uptake of beneficial substances, maintains the stability of plasma membranes, and enhances the activity of various antioxidant enzymes, thus alleviating adverse effects in plants under abiotic stresses. Future research directions on the relationship between Se and abiotic stresses in plants are proposed. This article will further deepen our understanding of the relationship between Se and plants.

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Mechanisms underlying mercury detoxification in soil–plant systems after selenium application: a review

Cited by 25 publications

References 212 publications

Melatonin Participates in Selenium-Enhanced Cold Tolerance of Cucumber Seedlings

Melatonin Participates in Selenium-Enhanced Cold Tolerance of Cucumber Seedlings

Nodulated White Lupin Plants Growing in Contaminated Soils Accumulate Unusually High Mercury Concentrations in Their Nodules, Roots and Especially Cluster Roots

Selenium Regulates Antioxidant, Photosynthesis, and Cell Permeability in Plants under Various Abiotic Stresses: A Review

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