Heavy metal-induced oxidative damage, defense reactions, and detoxification mechanisms in plants

• Autorzy: Sytar O. , Latowski D. , Kumar A. , Kuczynska P. , Strzalka K. , Prasad M. N. V.
• Języki publikacji: EN

Abstrakty

EN

Heavy metal (HMs) contamination is widespread globally due to anthropogenic, technogenic, and geogenic activities. The HMs exposure could lead to multiple toxic effects in plants by inducing reactive oxygen species (ROS), which inhibit most cellular processes at various levels of metabolism. ROS being highly unstable could play dual role (1) damaging cellular components and (2) act as an important secondary messenger for inducing plant defense system. Cells are equipped with enzymatic and non-enzymatic defense mechanisms to counteract this damage. Some are constitutive and others that are activated only when a stress-specific signal is perceived. Enzymatic scavengers of ROS include superoxide dismutase, catalase, glutathione reductase, and peroxidase, while nonenzymatic antioxidants are glutathione, ascorbic acid, a-tocopherol, flavonoids, anthocyanins, carotenoids, and organic acids. The intracellular and extracellular chelation mechanisms of HMs are associated with organic acids such as citric, malic and oxalic acid, etc. The important mechanism of detoxification includes metal complexation with glutathione, amino acids, synthesis of phytochelatins and sequestration into the vacuoles. Excessive stresses induce a cascade, MAPK (mitogen-activated protein kinase) pathway and synthesis of metal-detoxifying ligands. Metal detoxification through MAPK cascade and synthesis of metal-detoxifying ligands will be of considerable interest in the field of plant biotechnology. Further, the photoprotective roles of pigments of xanthophylls cycle under HMs stress were also discussed.

• Wydawca: -
• Czasopismo: Acta Physiologiae Plantarum
• Rocznik: 2013
• Tom: 35
• Numer: 04
• Opis fizyczny: p.985-999,fig.,ref.

Twórcy

autor

Sytar O.

• Department of Plant Sciences, University of Hyderabad, Hyderabad 500046, India
• Department of Plant Physiology and Ecology, Kyiv National University of Taras Shevchenko, Volodymyrskya str. 64, Kyiv 01033, Ukraine

autor

Latowski D.

• Departament of Plant Physiology and Biochemistry, Faculty of Biochemistry, Biophysics and Biotechnology, Jagiellonian University, Gronostajowa str. 7, 30-387 Krakow, Poland

autor

Kumar A.

• Department of Plant Sciences, University of Hyderabad, Hyderabad 500046, India

autor

Kuczynska P.

• Departament of Plant Physiology and Biochemistry, Faculty of Biochemistry, Biophysics and Biotechnology, Jagiellonian University, Gronostajowa str. 7, 30-387 Krakow, Poland

autor

Strzalka K.

• Departament of Plant Physiology and Biochemistry, Faculty of Biochemistry, Biophysics and Biotechnology, Jagiellonian University, Gronostajowa str. 7, 30-387 Krakow, Poland

autor

Prasad M. N. V.

• Department of Plant Sciences, University of Hyderabad, Hyderabad 500046, India

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