Selenomethionine induces oxidative stress and modifies growth in rice (Oryza sativa L.) seedlings through effects on hormone biosynthesis and primary metabolism
| Autor: | Agustin Zsögön, Fabrício C.M. Gonçalves, Dimas M. Ribeiro, Rafael S. P. Malheiros, Fred A.L. Brito |
|---|---|
| Rok vydání: | 2020 |
| Předmět: |
Health
Toxicology and Mutagenesis 0211 other engineering and technologies chemistry.chemical_element 02 engineering and technology 010501 environmental sciences medicine.disease_cause 01 natural sciences Antioxidants chemistry.chemical_compound Methionine Plant Growth Regulators Auxin medicine Selenomethionine 0105 earth and related environmental sciences chemistry.chemical_classification 021110 strategic defence & security studies Reactive oxygen species Oryza sativa Indoleacetic Acids biology Public Health Environmental and Occupational Health food and beverages Oryza General Medicine Ethylenes biology.organism_classification Pollution Oxidative Stress chemistry Biochemistry Seedlings Seedling Growth inhibition Reactive Oxygen Species Selenium Oxidative stress |
| Zdroj: | Ecotoxicology and Environmental Safety. 189:109942 |
| ISSN: | 0147-6513 |
| DOI: | 10.1016/j.ecoenv.2019.109942 |
| Popis: | Although the chemical characteristics of selenomethionine (SeMet) are similar to those of methionine (Met), the physiological activity of SeMet apparently differs in its ability to stimulate ethylene production in plant tissues. Since selenium alters root architecture of rice seedlings by modifying ethylene production, the investigation of the effect of SeMet and Met on rice growth would be a step forward towards unraveling factors that underlie selenium toxicity. Here, we report that SeMet increased concentrations of reactive oxygen species (ROS), inhibiting auxin and increasing ethylene production in rice seedlings. The effect of SeMet on seedlings was mediated by the inhibition of the abundance of transcripts encoding auxin transport and cell expansion proteins. Moreover, SeMet led to increased seedling respiration, which was positively correlated with organic acids consumption, but negatively with sugars consumption, thereby decreasing seedling growth. In contrast with SeMet treatment, Met did not affect ROS production, hormone biosynthesis and seedling growth, indicating an exclusive selenium effect. The singlet oxygen scavenger, 1,4-diazabicyclooctane, overrode the repressive effect of SeMet in seedling growth. Our results demonstrate a phytotoxic effect of SeMet for rice seedlings and reveal a relationship between reactive oxygen species, hormone homeostasis and carbon availability, which regulates growth responses. |
| Databáze: | OpenAIRE |
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