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Protection of rice against Nilaparvata lugens by direct toxicity of sodium selenate

Freja Scheys (UGent) , Kristof De Schutter (UGent) , Subramanyam Kondeti (UGent) , Els Van Damme (UGent) and Guy Smagghe (UGent)
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Abstract
Nilaparvata lugens is one of the most notorious pest insects of cultured rice, and outbreaks of N. lugens cause high economic losses each year. While pest control by chemical pesticides is still the standard procedure for treating N. lugens infections, excessive use of these insecticides has led to the emergence of resistant strains and high pesticide residues in plants for human consumption and the environment. Therefore, novel and environment-friendly pest control strategies are needed. In previous studies, selenium was shown to protect selenium-accumulating plants from biotic stress. However, studies on nonaccumulator (crop) plants are lacking. In this study, rice plants (Oryza sativa, Nipponbare) were treated with sodium selenate by seed priming and foliar spray and then infested with N. lugens. Brown planthoppers feeding on these plants showed increased mortality compared to those feeding on control plants. Treatment of the plants with sodium selenate did not affect the enzymes involved in the biosynthesis of the plant stress hormones jasmonic acid and salicylic acid, suggesting that the observed insect mortality cannot be attributed to the activation of these hormonal plant defenses. Feeding assays using an artificial diet supplemented with sodium selenate revealed direct toxicity toward N. lugens. With a low concentration of 6.5 +/- 1.5 mu M sodium selenate, half of the insects were killed after 3 days. In summary, sodium selenate treatment of plants can be used as a potential alternative pest management strategy to protect rice against N. lugens infestation through direct toxicity.
Keywords
Nilaparvata lugens, rice, selenium, sodium selenate, toxicity, SELENIUM ACCUMULATION, BROWN PLANTHOPPER, PLANT, SPECIATION, HERBIVORY, BIOACCUMULATION, HOMOPTERA, EVOLUTION, ENZYMES, FORM

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MLA
Scheys, Freja, et al. “Protection of Rice against Nilaparvata Lugens by Direct Toxicity of Sodium Selenate.” ARCHIVES OF INSECT BIOCHEMISTRY AND PHYSIOLOGY, vol. 103, no. 3, 2020.
APA
Scheys, F., De Schutter, K., Kondeti, S., Van Damme, E., & Smagghe, G. (2020). Protection of rice against Nilaparvata lugens by direct toxicity of sodium selenate. ARCHIVES OF INSECT BIOCHEMISTRY AND PHYSIOLOGY, 103(3).
Chicago author-date
Scheys, Freja, Kristof De Schutter, Subramanyam Kondeti, Els Van Damme, and Guy Smagghe. 2020. “Protection of Rice against Nilaparvata Lugens by Direct Toxicity of Sodium Selenate.” ARCHIVES OF INSECT BIOCHEMISTRY AND PHYSIOLOGY 103 (3).
Chicago author-date (all authors)
Scheys, Freja, Kristof De Schutter, Subramanyam Kondeti, Els Van Damme, and Guy Smagghe. 2020. “Protection of Rice against Nilaparvata Lugens by Direct Toxicity of Sodium Selenate.” ARCHIVES OF INSECT BIOCHEMISTRY AND PHYSIOLOGY 103 (3).
Vancouver
1.
Scheys F, De Schutter K, Kondeti S, Van Damme E, Smagghe G. Protection of rice against Nilaparvata lugens by direct toxicity of sodium selenate. ARCHIVES OF INSECT BIOCHEMISTRY AND PHYSIOLOGY. 2020;103(3).
IEEE
[1]
F. Scheys, K. De Schutter, S. Kondeti, E. Van Damme, and G. Smagghe, “Protection of rice against Nilaparvata lugens by direct toxicity of sodium selenate,” ARCHIVES OF INSECT BIOCHEMISTRY AND PHYSIOLOGY, vol. 103, no. 3, 2020.
@article{8658068,
  abstract     = {Nilaparvata lugens is one of the most notorious pest insects of cultured rice, and outbreaks of N. lugens cause high economic losses each year. While pest control by chemical pesticides is still the standard procedure for treating N. lugens infections, excessive use of these insecticides has led to the emergence of resistant strains and high pesticide residues in plants for human consumption and the environment. Therefore, novel and environment-friendly pest control strategies are needed. In previous studies, selenium was shown to protect selenium-accumulating plants from biotic stress. However, studies on nonaccumulator (crop) plants are lacking. In this study, rice plants (Oryza sativa, Nipponbare) were treated with sodium selenate by seed priming and foliar spray and then infested with N. lugens. Brown planthoppers feeding on these plants showed increased mortality compared to those feeding on control plants. Treatment of the plants with sodium selenate did not affect the enzymes involved in the biosynthesis of the plant stress hormones jasmonic acid and salicylic acid, suggesting that the observed insect mortality cannot be attributed to the activation of these hormonal plant defenses. Feeding assays using an artificial diet supplemented with sodium selenate revealed direct toxicity toward N. lugens. With a low concentration of 6.5 +/- 1.5 mu M sodium selenate, half of the insects were killed after 3 days. In summary, sodium selenate treatment of plants can be used as a potential alternative pest management strategy to protect rice against N. lugens infestation through direct toxicity.},
  articleno    = {e21644},
  author       = {Scheys, Freja and De Schutter, Kristof and Kondeti, Subramanyam and Van Damme, Els and Smagghe, Guy},
  issn         = {0739-4462},
  journal      = {ARCHIVES OF INSECT BIOCHEMISTRY AND PHYSIOLOGY},
  keywords     = {Nilaparvata lugens,rice,selenium,sodium selenate,toxicity,SELENIUM ACCUMULATION,BROWN PLANTHOPPER,PLANT,SPECIATION,HERBIVORY,BIOACCUMULATION,HOMOPTERA,EVOLUTION,ENZYMES,FORM},
  language     = {eng},
  number       = {3},
  pages        = {10},
  title        = {Protection of rice against Nilaparvata lugens by direct toxicity of sodium selenate},
  url          = {http://dx.doi.org/10.1002/arch.21644},
  volume       = {103},
  year         = {2020},
}

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