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http://hdl.handle.net/10773/18740
Título: | Metal/metalloid stress tolerance in plants: role of ascorbate, its redox couple, and associated enzymes |
Autor: | Anjum, Naser A. Gill, Sarvajeet S. Gill, Ritu Hasanuzzaman, Mirza Duarte, Armando C. Pereira, Eduarda Ahmad, Iqbal Tuteja, Renu Tuteja, Narendra |
Palavras-chave: | Antoxidant defense system AsA/DHA redox couple Ascorbate Metal stress Plant metal tolerance |
Data: | 2014 |
Editora: | Springer |
Resumo: | The enhanced generation of reactive oxygen species (ROS) under metal/metalloid stress is most common in plants, and the elevated ROS must be successfully metabolized in order tomaintain plant growth, development, and productivity. Ascorbate (AsA) is a highly abundant metabolite and a watersoluble antioxidant, which besides positively influencing various aspects in plants acts also as an enigmatic component of plant defense armory. As a significant component of the ascorbate-glutathione (AsA-GSH) pathway, it performs multiple vital functions in plants including growth and development by either directly or indirectly metabolizing ROS and its products. Enzymes such as monodehydroascorbate reductase (MDHAR, EC 1.6.5.4) and dehydroascorbate reductase (DHAR, EC 1.8.5.1) maintain the reduced form of AsA pool besides metabolically controlling the ratio of AsA with its oxidized form (dehydroascorbate, DHA). Ascorbate peroxidase (APX, EC 1.11.1.11) utilizes the reduced AsA pool as the specific electron donor during ROS metabolism. Thus, AsA, its redox couple (AsA/DHA), and related enzymes (MDHAR, DHAR, and APX) cumulatively form an AsA redox system to efficiently protect plants particularly against potential anomalies caused by ROS and its products. Here we present a critical assessment of the recent research reports available on metal/metalloid-accrued modulation of reduced AsA pool, AsA/DHA redox couple and AsA-related major enzymes, and the cumulative significance of these antioxidant system components in plant metal/metalloid stress tolerance. |
Peer review: | yes |
URI: | http://hdl.handle.net/10773/18740 |
DOI: | 10.1007/s00709-014-0636-x |
ISSN: | 0033-183X |
Aparece nas coleções: | CESAM - Artigos DBio - Artigos DQ - Artigos |
Ficheiros deste registo:
Ficheiro | Descrição | Tamanho | Formato | |
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Anjum et al. - 2014 - Metalmetalloid stress tolerance in plants role o.pdf | 1.06 MB | Adobe PDF |
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