Mitochondrial alternative oxidase (AOX1a) is required for the mitigation of arsenic-induced oxidative stress in Arabidopsis thaliana
| Autor: | Gokhan Cucun, Nil Demircan, Baris Uzilday |
|---|---|
| Přispěvatelé: | Ege Üniversitesi |
| Rok vydání: | 2020 |
| Předmět: |
0106 biological sciences
0301 basic medicine Alternative oxidase Redox signalling Arabidopsis thaliana Mutant Plant Science medicine.disease_cause 01 natural sciences Plastid terminal oxidase 03 medical and health sciences medicine chemistry.chemical_classification Reactive oxygen species biology fungi Wild type food and beverages Arsenic stress biology.organism_classification Heavy metal 030104 developmental biology Biochemistry chemistry biology.protein Oxidative stress Alternative electron sinks 010606 plant biology & botany Biotechnology Peroxidase |
| Zdroj: | Plant Biotechnology Reports. 14:235-245 |
| ISSN: | 1863-5474 1863-5466 |
| Popis: | The element arsenic (As) is a non-essential metalloid that is found naturally in all soils and at high concentrations it is toxic to plant cells. As (V) can act as a chemical analogue of phosphate, it can disrupt phosphate-related energy metabolism and lipid structure. in this study, the contribution of mitochondrial alternative oxidase (AOX) and chloroplastic plastid terminal oxidase (PTOX) to As (V) stress tolerance was investigated. Our data indicate that As (V) stress (100, 200 and 300 mu M) induces AOX gene expression by 3.3- to 10.5-fold depending on AOX gene, but not PTOX expression in wild-type A. thaliana plants. To further elucidate the role of AOX in As (V) stress tolerance, we utilized aox1a mutants and observed that aox1a mutants had decreased growth and higher oxidative stress damage under stress conditions, while there were no differences under control conditions. Moreover, acclimation of aox1a plants to new cellular redox environment was investigated by measuring the activities of reactive oxygen species (ROS)-scavenging enzymes. Induction of mitochondrial MnSOD activity at 300 mu M As (V) was higher in aox1a plants (70%), when compared to wild type (43%). However, total ascorbate peroxidase and dehydroascorbate reductase activities were lower in aox1a plants when compared to wild type, which might explain higher oxidative damage observed in this genotype. on the other hand, NADPH oxidase activity, which is involved in ROS signaling, was lower in aox1a plants under normal conditions but a higher induction was observed with As (V) stress. Overall, our data indicate that AOX1a is involved in adaptation to As (V)-induced oxidative stress. Korean Acad Sci & Technol, Assoc Acad & Sco Sci Asia |
| Databáze: | OpenAIRE |
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