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논문 기본 정보
- 자료유형
- 학술저널
- 저자정보
- 발행연도
- 2020.1
- 수록면
- 235 - 245 (11page)
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초록· 키워드
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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 μM) 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 diff erences 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 μM 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.
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참고문헌 (46)
참고문헌 신청
Abbas G / 2018 / Arsenic uptake, toxicity, detoxifi cation, and speciation in plants : physiological, biochemical, and molecular aspects / Int J Environ Res Public Health 15:59
Abercrombie JM / 2008 / Transcriptional responses of Arabidopsis thaliana plants to As (V) stress / BMC Plant Biol 8:87
Anjum NA / 2016 / Catalase and ascorbate peroxidase—representative H 2 O 2-detoxifying heme enzymes in plants / Environ Sci Pollut Res 23:19002~19029
Beauchamp C / 1971 / Superoxide dismutase : improved assays and an assay applicable to acrylamide gels / Anal Biochem 44:276~287
Beauchamp CO / 1973 / Isozymes of superoxide dismutase from wheat germ / BBA Protein Struct M 317:50~64
Abercrombie JM / 2008 / Transcriptional responses of Arabidopsis thaliana plants to As (V) stress / BMC Plant Biol 8:87
Anjum NA / 2016 / Catalase and ascorbate peroxidase—representative H 2 O 2-detoxifying heme enzymes in plants / Environ Sci Pollut Res 23:19002~19029
Beauchamp C / 1971 / Superoxide dismutase : improved assays and an assay applicable to acrylamide gels / Anal Biochem 44:276~287
Beauchamp CO / 1973 / Isozymes of superoxide dismutase from wheat germ / BBA Protein Struct M 317:50~64
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