Soil and foliar applications of silicon and selenium effects on cadmium accumulation and plant growth by modulation of antioxidant system and Cd translocation: Comparison of soft vs. durum wheat varieties

Zhou, Jun; Zhang, Chen; Du, Buyun; Cui, Hongbiao; Fan, Xingjun; Zhou, Dongmei; Zhou, Jing

doi:10.1016/j.jhazmat.2020.123546

Cited by 142 publications

(43 citation statements)

References 67 publications

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“…12 Furthermore, reduction of Cd concentrations in rice plant by Se and Si can be caused by a decrease in Cd uptake and an increase in rice biomass, which decreased Cd concentrations in rice plants ("dilution effect"). 24 Unlike Si application, Se application can enhance the production of phytochelatins and activate phytochelatin-Cd chelation to detoxify in rice, which is related to the synthesis of selenoenzyme (e.g., glutathione). 17,21 One study using extended X-ray absorption fine structure (EXAFS) analysis illustrated approximately 65% of the Cd in the seed of Thlaspi praecox presented as the Cd− thiolate complex, where the strong Cd−S bond was very stable and minimized the toxicity to the plants.…”

Section: Discussionmentioning

confidence: 99%

“…17,18 Silicon (Si) and selenium (Se) can alleviate the phytotoxicity in many plants under heavy metal stress 19−22 and are regarded as effective and environmentally friendly ways to reduce their accumulation in various crops (e.g., rice, wheat, maize, medicago, and barley). 8,18,23,24 Si and Se are regarded as beneficial elements with respect to resistance to Cd stress in plants via the decrease in oxidative stress, 25,26 compartmentalization and complexation, 27,28 improvement of photosynthesis, 8 balance of nutrients, 29 and regulation of transporter gene expression. 23 Nevertheless, no convincing explanation of the mechanism of the impact of Si and Se on Cd transfer within plants has been reported.…”

Section: Introductionmentioning

confidence: 99%

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Influence of Silicon and Selenium and Contribution of the Node to Cadmium Allocation and Toxicity in Rice

Zhou

Gao

Cui

et al. 2021

ACS Agric. Sci. Technol.

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Minimization of cadmium (Cd) in edible parts of crops is regarded as an effective approach for reducing the threat of Cd to public health. Beneficial elements selenium (Se) and silicon (Si) have been shown to promote rice growth and to reduce the rice Cd concentration under Cd stress. We performed a field experiment that highlighted the role of stem nodes and foliar Si and Se sprayings on the accumulation of Cd in 14 rice tissues, including brown rice, husk, panicle, four nodes, four internodes, and three leaves. The results indicated that foliar Se and Si applications significantly decreased brown rice Cd concentrations by 56% and 50% from 1.5 mg kg–1 to 0.66 and 0.75 mg kg–1, respectively. The applications of Se and Si were mainly through the reduction of the accumulation of Cd in rice roots by 27% and 32%, resulting in decreases in Cd in nodes by 53–76% and 26–60% respectively, while Cd concentrations were not significantly reduced in leaves and internodes. The first node beneath the panicle (N I) also played a critical role in the allocation of Cd within rice plants, whereas foliar Se and Si sprayings significantly reduced the extent of transfer of Cd from node I to the first internode and rice grain and significantly increased the extent of transfer of Cd to the flag leaf. However, N III had no effects on the transport of Cd to upper organs and N II promoted the translocation of Cd to upper organs after applications of Se and Si. Applications of Se and Si also improve the uptake of most of the mineral nutrients in N I. Overall, reduction of Cd in rice root and nodes and allocation of Cd in N I are the key steps in the accumulation of Cd in brown rice.

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Influence of Silicon and Selenium and Contribution of the Node to Cadmium Allocation and Toxicity in Rice

Zhou

Gao

Cui

et al. 2021

ACS Agric. Sci. Technol.

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“…Presoaking with Se induced an enhancement of CAT, APX, and GR activities (Saidi et al, 2014). Two varieties of wheat (soft and durum) showed a reduction of Cd toxicity due to the external supply of Se via root and foliar, where a reduction of lipid peroxidation and an increase in SOD and POD activities were observed (Zhou et al, 2021).…”

Section: Se Enhances Antioxidant Defense Under Metal/metalloid Toxicitymentioning

confidence: 99%

Selenium Supplementation and Crop Plant Tolerance to Metal/Metalloid Toxicity

et al. 2022

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Selenium (Se) supplementation can restrict metal uptake by roots and translocation to shoots, which is one of the vital stress tolerance mechanisms. Selenium can also enhance cellular functions like membrane stability, mineral nutrition homeostasis, antioxidant response, photosynthesis, and thus improve plant growth and development under metal/metalloid stress. Metal/metalloid toxicity decreases crop productivity and uptake of metal/metalloid through food chain causes health hazards. Selenium has been recognized as an element essential for the functioning of the human physiology and is a beneficial element for plants. Low concentrations of Se can mitigate metal/metalloid toxicity in plants and improve tolerance in various ways. Selenium stimulates the biosynthesis of hormones for remodeling the root architecture that decreases metal uptake. Growth enhancing function of Se has been reported in a number of studies, which is the outcome of improvement of various physiological features. Photosynthesis has been improved by Se supplementation under metal/metalloid stress due to the prevention of pigment destruction, sustained enzymatic activity, improved stomatal function, and photosystem activity. By modulating the antioxidant defense system Se mitigates oxidative stress. Selenium improves the yield and quality of plants. However, excessive concentration of Se exerts toxic effects on plants. This review presents the role of Se for improving plant tolerance to metal/metalloid stress.

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“…It has been well-established that wheat (Triticum aestivum L.) has a higher Cd absorption capacity than other cereal crops (Zhou et al, 2021). In developing countries, more than 80% of wheat supply is used as a staple food, compared to developed countries that use less than 50% (Awika, 2011); thus, inhabitants may intake a high quantity of Cd through grains posing a high health risk to human beings (Abedi and Mojiri, 2020).…”

Section: Introductionmentioning

confidence: 99%

The Impact of Bio-Stimulants on Cd-Stressed Wheat (Triticum aestivum L.): Insights Into Growth, Chlorophyll Fluorescence, Cd Accumulation, and Osmolyte Regulation

et al. 2022

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It has been established that wheat (Triticum aestivum L.) has a higher Cd absorption capacity than other cereal crops causing an excess daily Cd intake and a huge threat for public health. Therefore, the reduction of Cd accumulation in wheat from the soil is a crucial food-security issue. A pot trial was performed on Cd-stressed wheat seedlings to evaluate the morphological and physio-biochemical responses via foliage spray of two different bio-stimulants, i.e., ascorbic acid (AsA) and moringa leaf extract (MLE). Two wheat cultivars (Fsd-08 and Glxy-13) were exposed to cadmium (CdCl2.5H2O) stress (0, 500, and 1,000 μM), along with foliar spray of AsA (0 and 50 mM) and MLE (0 and 3%). The most observable growth reduction was documented in plants that are exposed to a higher Cd concentration (1,000 μM), followed by the lower Cd level (500 μM). The wheat growth attributes, such as number of leaves per plant, number of tillers per plant, biomass yield, shoot/root length, and leaf area, were greatly depressed under the Cd stress, irrespective of the cultivar. Under the increasing Cd stress, a significant diminution was observed in maximum photochemical efficiency (Fv/Fm), photochemical quenching (qP), and electron transport rate (ETR) accompanied with reduced gas exchange attributes. However, Cd-induced phytotoxicity enhanced the non-photochemical quenching (NPQ) and internal carbon dioxide concentration (Ci), which was confirmed by their significant positive correlation with Cd contents in shoot and root tissues of both cultivars. The contents of proline, AsA, glycine betaine (GB), tocopherol, total free amino acid (TFAA), and total soluble sugar (TSS) were greatly decreased with Cd stress (1,000 μM), while MLE and AsA significantly enhanced the osmolytes accumulation under both Cd levels (especially 500 μM level). The Cd accumulation was predominantly found in the root as compared to shoots in both cultivars, which has declined after the application of MLE and AsA. Conclusively, MLE was found to be more effective to mitigate Cd-induced phytotoxicity up to 500 μM Cd concentration, compared with the AsA amendment.

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Soil and foliar applications of silicon and selenium effects on cadmium accumulation and plant growth by modulation of antioxidant system and Cd translocation: Comparison of soft vs. durum wheat varieties

Cited by 142 publications

References 67 publications

Influence of Silicon and Selenium and Contribution of the Node to Cadmium Allocation and Toxicity in Rice

Influence of Silicon and Selenium and Contribution of the Node to Cadmium Allocation and Toxicity in Rice

Selenium Supplementation and Crop Plant Tolerance to Metal/Metalloid Toxicity

The Impact of Bio-Stimulants on Cd-Stressed Wheat (Triticum aestivum L.): Insights Into Growth, Chlorophyll Fluorescence, Cd Accumulation, and Osmolyte Regulation

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