NICKEL TOXICITY INDUCES OXIDATIVE DAMAGE IN<i>ZEA MAYS</i>ROOTS

Baccouch, Salem; Chaoui, Abdelilah; Ferjani, Ezzedine El

doi:10.1081/pln-100103805

Cited by 122 publications

(81 citation statements)

References 44 publications

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“…Several authors have highlighted the activation of reactive oxygen species (ROS) scavenging systems to ameliorate the oxidative burst induced upon exposure of plants to heavy metals (Baccouch et al 2001;Arvind & Prasad 2005;Rodriguez-Serrano et al 2006;Gajewska & Sk lodowska 2008). Crucial role in plant adaptation to heavy metal toxicity is played by the protective antioxidant system (Jocsak et al 2008;Maysa & Abdel-Aal 2008;Yadav 2010).…”

Section: Introductionmentioning

confidence: 99%

Metal uptake, antioxidant status and membrane potential in maize roots exposed to cadmium and nickel

et al. 2014

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Root growth of the seedlings of maize cultivars Premia and Blitz exposed to 2 µM cadmium (Cd), nickel (Ni) or both metals acting simultaneously (Cd + Ni) for 72 h was significantly reduced but not ceased. The effect was more pronounced in the seedlings of the cv. Blitz. The heavy metals (HMs) contents increased significantly in the roots. Simultaneous application of metals had an antagonistic effect on either Cd or Ni uptake in Premia but not in Blitz. In control roots the contents of ascorbic acid (AsA) and dehydroascorbic acid (DHA) were lower and gluthatione (GSH) content was higher in Premia than in Blitz. A decrease of AsA content was induced by all metal treatments in Premia but only by Cd + Ni in Blitz while an increase was induced by single metals in this cultivar. All metal treatments increased DHA contents in both cultivars. GSH content decreased significantly in Premia treated with Cd or Cd + Ni, and in Blitz treated with Ni. Unlike the contents of AsA, DHA and GSH, the increased metal concentrations in root cells did not affect the membrane potential (EM). The changes in antioxidant contents depended on both, maize genotypes and HMs treatments. Nevertheless, the results indicated a role of antioxidative system in minimizing the effects of oxidative stress and protecting cell membranes in both maize cultivars.

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Section: Introductionmentioning

confidence: 99%

Metal uptake, antioxidant status and membrane potential in maize roots exposed to cadmium and nickel

et al. 2014

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“…Phytotoxity from heavy metals is closely related to the production of reactive oxygen species (ROS) in plants (Mithofer et al, 2004). It has been demonstrated that excessive nickel leads to a significant increase in the concentration of hydrogen peroxide (H 2 O 2 ) (Booninathan and Doran, 2002) and the membrane lipid peroxidation in a few plant species (Schickler and Caspi, 1999;Booninathan and Doran, 2002;Baccouch et al, 2001). However, the molecular mechanism for the generation of reactive oxygen species (ROS) and the factors that affect the syntheses of ROS in Ni-treated aquatic plants are largely unknown.…”

Section: Introductionmentioning

confidence: 99%

Antioxidative parameters in the opposite-leaved pondweed (Gronlendia densa) in response to nickel stress

Yılmaz

Parlak

2011

Chemical Speciation & Bioavailability

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The process of stress adaption was studied in Groenlandia densa (opposite-leaved pondweed) grown in the presence of different Ni concentrations (0 -20 mg Ni L À 1 ). The results showed that Ni concentrations in plants increased with the increasing Ni supply levels and reached a maximum of 47.57 mg kg À 1 DW at 5 mg L À 1 Ni treatments. The level of photosynthetic pigments (Chl a, Chl b and Chl total) decreased only upon exposure to high Ni concentrations. However, total soluble proteins increased with increasing nickel supply levels. At the same time, the level of malondialdehyde (MDA) increased with increasing Ni concentration. Significant increases in antioxidant activities of studied enzymes such as superoxide dismutase (SOD), catalase (CAT), glutathione reductase (GR), glutathione S-transferase (GST) and ascorbate peroxidase (APX) were recorded in this plant subjected to increasing Ni levels. Cellular antioxidant levels showed a decline suggesting a defensive mechanism to protect against oxidative stress caused by nickel. In addition, the proline content in G. densa increased with increasing nickel levels. These findings suggest that G. densa is equipped with efficient antioxidant mechanism against Ni-induced oxidative stress which protects photosynthetic machinery from damage.Our present study concluded that G. densa has a high level of nickel tolerance and accumulation. We also found that moderate nickel treatment (0.05 -5 mg L ) could cause an increasing generation of ROS, which was effectively scavenged by the antioxidative system. Therefore, G. densa may be used as a phytoremediator in moderately polluted aquatic ecosystems.

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“…However, numerous evidences indicate that the Ni toxicity can be attributed also to oxidative stress at the cellular level (BACCOUCH et al, 2001;GONNELLI et al, 2001). Under stress conditions, including exposure to excessive concentrations of heavy metals, there is imbalance and removal of reactive oxygen species in plant tissues (GRATÃO et al, 2005;GRATÃO et al, 2008).…”

Section: Resultsmentioning

confidence: 99%