scispace - formally typeset
Search or ask a question
Journal ArticleDOI

Selenium as a Protective Agent Against Pests: A Review.

01 Aug 2019-Vol. 8, Iss: 8, pp 262
TL;DR: Accumulated selenium protects plants against aphids, weevils, cabbage loopers, cabbage root flies, beetles, caterpillars, and crickets due to both deterrence and toxicity.
Abstract: The aim of the present review is to summarize selenium’s connection to pests. Phytopharmaceuticals for pest control, which increase the pollution in the environment, are still widely used nowadays regardless of their negative characteristics. The use of trace elements, including selenium, can be an alternative method of pest control. Selenium can repel pests, reduce their growth, or cause toxic effects while having a positive effect on the growth of plants. In conclusion, accumulated selenium protects plants against aphids, weevils, cabbage loopers, cabbage root flies, beetles, caterpillars, and crickets due to both deterrence and toxicity.
Citations
More filters
Journal ArticleDOI
TL;DR: The goal of this review is to report the present knowledge of the distribution and processes of Se in soil and at the plant-soil interface, and of Se behaviour inside the plant in terms of biofortification, to unravel the Se metabolic pathways that affect the nutritional value of edible plant products, various Se bioFortification strategies in challenging environments, as well as the impact of Se-enriched food on human health.
Abstract: Selenium (Se) is an essential element for mammals and its deficiency in the diet is a global problem. Plants accumulate Se and thus represent a major source of Se to consumers. Agronomic biofortification intends to enrich crops with Se in order to secure its adequate supply by people. The goal of this review is to report the present knowledge of the distribution and processes of Se in soil and at the plant-soil interface, and of Se behaviour inside the plant in terms of biofortification. It aims to unravel the Se metabolic pathways that affect the nutritional value of edible plant products, various Se biofortification strategies in challenging environments, as well as the impact of Se-enriched food on human health. Agronomic biofortification and breeding are prevalent strategies for battling Se deficiency. Future research addresses nanosized Se biofortification, crop enrichment with multiple micronutrients, microbial-integrated agronomic biofortification, and optimization of Se biofortification in adverse conditions. Biofortified food of superior nutritional quality may be created, enriched with healthy Se-compounds, as well as several other valuable phytochemicals. Whether such a food source might be used as nutritional intervention for recently emerged coronavirus infections is a relevant question that deserves investigation.

114 citations


Cites background from "Selenium as a Protective Agent Agai..."

  • ...Alternatively, Se could be employed as an ecological insecticide (Mechora 2019) or fungicide (Wu et al. 2014; Xu et al. 2020)....

    [...]

Journal ArticleDOI
TL;DR: The role, responses, prospects and mechanisms of trace element selenium in human nutrition are summarized in this paper, where the authors also elaborates how bio-fortification is a plausible approach to resolving Se deficiency in humans and other animals.
Abstract: The trace element selenium (Se) is a crucial element for many living organisms, including soil microorganisms, plants and animals, including humans Generally, in Nature Se is taken up in the living cells of microorganisms, plants, animals and humans in several inorganic forms such as selenate, selenite, elemental Se and selenide These forms are converted to organic forms by biological process, mostly as the two selenoamino acids selenocysteine (SeCys) and selenomethionine (SeMet) The biological systems of plants, animals and humans can fix these amino acids into Se-containing proteins by a modest replacement of methionine with SeMet While the form SeCys is usually present in the active site of enzymes, which is essential for catalytic activity Within human cells, organic forms of Se are significant for the accurate functioning of the immune and reproductive systems, the thyroid and the brain, and to enzyme activity within cells Humans ingest Se through plant and animal foods rich in the element The concentration of Se in foodstuffs depends on the presence of available forms of Se in soils and its uptake and accumulation by plants and herbivorous animals Therefore, improving the availability of Se to plants is, therefore, a potential pathway to overcoming human Se deficiencies Among these prospective pathways, the Se-biofortification of plants has already been established as a pioneering approach for producing Se-enriched agricultural products To achieve this desirable aim of Se-biofortification, molecular breeding and genetic engineering in combination with novel agronomic and edaphic management approaches should be combined This current review summarizes the roles, responses, prospects and mechanisms of Se in human nutrition It also elaborates how biofortification is a plausible approach to resolving Se-deficiency in humans and other animals

82 citations

Journal ArticleDOI
TL;DR: In this paper, the effect of nanoselenium (nano-Se) on the resistance of wheat to S. avenae was investigated. And the results revealed that the combination of nano-Se and melatonin could achieve the best overall performance by reducing the S. vindae number by 52.2%.
Abstract: The mechanism of nanoselenium (nano-Se) improving the resistance induced by plant components to aphids is unclear. In this study, foliar sprayed nano-Se (5.0 mg/L) could significantly reduce the Sitobion avenae number (36%) compared with that in the control. Foliar application of nano-Se enhanced the antioxidant capacity by reducing malondialdehyde (MDA) and increasing GSH-Px, CAT, GSH, Pro, and VE concentrations in wheat seedlings. The phenylpropane pathway was activated by nano-Se biofortification, which increased apigenin and caffeic acid concentrations. The high-level expression of the related genes (TaBx1A, TaBx3A, TaBx4A, TaASMT2, and TaCOMT) induced the promotion of melatonin (88.6%) and 2,4-dihydroxy-7-methoxy-1,4-benzoxazin-3-one (DIMBOA) (64.3%). Different ratios of the secondary metabolites to nano-Se were taken to examine the effects on resistance of wheat to S. avenae. The results revealed that the combination of nano-Se and melatonin could achieve the best overall performance by reducing the S. avenae number by 52.2%. The study suggests that the coordinated applications of nano-Se and melatonin could more effectively improve the wheat resistance to aphids via the promotion of volatile organic compound synthesis and modulation in phenylpropane and indole metabolism pathways.

16 citations

References
More filters
Journal ArticleDOI

1,676 citations


"Selenium as a Protective Agent Agai..." refers background in this paper

  • ...It was known as toxic to organisms until its essentiality was discovered [1]....

    [...]

Journal ArticleDOI
28 Nov 2003
TL;DR: Recent advances in the understanding of the plant's ability to metabolize Se into volatile Se forms (phytovolatilization) are discussed, along with the application of phytoremediation for the cleanup of Se contaminated environments.
Abstract: Plants vary considerably in their physiological response to selenium (Se). Some plant species growing on seleniferous soils are Se tolerant and accumulate very high concentrations of Se (Se accumulators), but most plants are Se nonaccumulators and are Se-sensitive. This review summarizes knowledge of the physiology and biochemistry of both types of plants, particularly with regard to Se uptake and transport, biochemical pathways of assimilation, volatilization and incorporation into proteins, and mechanisms of toxicity and tolerance. Molecular approaches are providing new insights into the role of sulfate transporters and sulfur assimilation enzymes in selenate uptake and metabolism, as well as the question of Se essentiality in plants. Recent advances in our understanding of the plant's ability to metabolize Se into volatile Se forms (phytovolatilization) are discussed, along with the application of phytoremediation for the cleanup of Se contaminated environments.

1,243 citations


"Selenium as a Protective Agent Agai..." refers background in this paper

  • ...Further on SeCys is transformed to SeMet and volatile forms [29] (Figure 1)....

    [...]

  • ...Metabolism of inorganic forms to SeCys is located in chloroplasts [29] therefore the selenate transformation takes place in the leaf....

    [...]

  • ...Metabolism of Se in accumulators and nonaccumulators differs; nonaccumulators incorporate SeCys and SeMet into proteins, while accumulators these forms transform to SeMeSeMet and SeMeSeCys and further on to volatile forms (Figure 1) [29,32]....

    [...]

Journal ArticleDOI
TL;DR: The exploitation of genetic resources used in bioengineering strategies of plants is illuminating the function of sulfate transporters and key enzymes of the S assimilatory pathway in relation to Se accumulation and final metabolic fate, providing the basic framework by which to resolve questions relating to the essentiality of Se in plants.
Abstract: The chemical and physical resemblance between selenium (Se) and sulfur (S) establishes that both these elements share common metabolic pathways in plants. The presence of isologous Se and S compounds indicates that these elements compete in biochemical processes that affect uptake, translocation and assimilation throughout plant development. Yet, minor but crucial differences in reactivity and other metabolic interactions infer that some biochemical processes involving Se may be excluded from those relating to S. This review examines the current understanding of physiological and biochemical relationships between S and Se metabolism by highlighting their similarities and differences in relation to uptake, transport and assimilation pathways as observed in Se hyperaccumulator and non-accumulator plant species. The exploitation of genetic resources used in bioengineering strategies of plants is illuminating the function of sulfate transporters and key enzymes of the S assimilatory pathway in relation to Se accumulation and final metabolic fate. These strategies are providing the basic framework by which to resolve questions relating to the essentiality of Se in plants and the mechanisms utilized by Se hyperaccumulators to circumvent toxicity. In addition, such approaches may assist in the future application of genetically engineered Se accumulating plants for environmental renewal and human health objectives.

576 citations


"Selenium as a Protective Agent Agai..." refers background in this paper

  • ...Metabolism of Se in accumulators and nonaccumulators differs; nonaccumulators incorporate SeCys and SeMet into proteins, while accumulators these forms transform to SeMeSeMet and SeMeSeCys and further on to volatile forms (Figure 1) [29,32]....

    [...]

Journal ArticleDOI
TL;DR: In this paper, the toxicity of Se can be attributed to metabolic disturbances, in addition to its pro-oxidative effects, which can be explained by the changes in the total chlorophyll concentration.
Abstract: Selenium is an essential element for antioxidation reactions in human and animals. In order to study its biological role in higher plants, ryegrass (Lolium perenne) was cultivated in a soil without Se or amended with increasing dosages of H2SeO4 (0.1, 1.0, 10.0 and 30.0 mg Se kg−1). Ryegrass was harvested twice and the yields were analyzed for antioxidative systems and growth parameters. Selenium exerted dual effects: At low concentrations it acted as an antioxidant, inhibiting lipid peroxidation, whereas at higher concentrations, it was a pro-oxidant, enhancing the accumulation of lipid peroxidation products. The antioxidative effect was associated with an increase in glutathione peroxidase (GSH-Px) activity, but not with superoxide dismutase (SOD) and αα-tocopherol, which was the only tocopherol detected. In the second yield, the diminished lipid peroxidation due to a proper Se addition coincided with promoted plant growth. The oxidative stress found at the Se addition level ≥ 10 mg kg−1 resulted in drastic yield losses. This result indicates that the toxicity of Se can be attributed, in addition to metabolic disturbances, to its pro-oxidative effects. Neither the growth-promoting nor the toxic effect of Se could be explained by the changes in the total chlorophyll concentration.

492 citations


"Selenium as a Protective Agent Agai..." refers background in this paper

  • ...In lower concentrations it acts as an antioxidant [16]; increases plant tolerance to drought [17], salt [18], and UV induced stress [19], and decreases the uptake of toxic metals or reduce their oxidative effect [20]....

    [...]

Journal ArticleDOI
TL;DR: There are several selenocompounds in tissues of plants and animals, and selenocysteine, the predominant selenoamino acid in tissues when inorganic selenium is given to animals, is one of them.
Abstract: There are several selenocompounds in tissues of plants and animals. Selenate is the major inorganic selenocompound found in both animal and plant tissues. Selenocysteine is the predominant selenoamino acid in tissues when inorganic selenium is given to animals. Selenomethionine is the major selenocompound found initially in animals given this selenoamino acid, but is converted with time afterwards to selenocysteine. Selenomethionine is the major selenocompound in cereal grains, grassland legumes and soybeans. Selenomethionine can also be the major selenocompound in selenium enriched yeast, but the amount can vary markedly depending upon the growth conditions. Se-methylselenocysteine is the major selenocompound in selenium enriched plants such as garlic, onions, broccoli florets and sprouts, and wild leeks.

470 citations