Nickel toxicity and peroxidase activity in seedlings of <i>Triticum aestivum</i> L.

The focus of the review is on the specific aspects of nickel's effects on growth, morphology, photosynthesis, mineral nutrition and enzyme activity of plants. The mobility of nickel in the environment and the consequent contamination in soil and water is of great concern. Also, the detrimental effects of excessive nickel on plant growth have been well known for many years. Toxic effects of nickel on plants include alterations in the germination process as well as in the growth of roots, stems and leaves. Total dry matter production and yield was significantly affected by nickel and also causes deleterious effects on plant physiological processes, such as photosynthesis, water relations and mineral nutrition. Nickel strongly influences metabolic reactions in plants and has the ability to generate reactive oxygen species which may cause oxidative stress. More recent evidence indicates that nickel is required in small amounts for normal plant growth and development. Hence, with the increasing level of nickel pollution in the environment, it is essential to understand the functional roles and toxic effects of nickel in plants.

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“…Exposure of wheat to high level of Ni 2? enhanced MDA concentration (Pandolfini et al 1992). Moreover, Gonnelli et al (2001) (Dimkpa et al 2008).…”

Section: Nickel Toxicity To Plantsmentioning

confidence: 89%

Occurrence, physiological responses and toxicity of nickel in plants

Sreekanth

Nagajyothi

Lee

et al. 2013

Int. J. Environ. Sci. Technol.

194

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“…PODs (EC 1.11.1.7) were extracted following the method of Pandolfini et al (1992) and determined in 3 fractions: the soluble (SPO), ionically (IPO) bound, and covalently (CPO) bound fractions.…”

Section: Lignification-related Enzyme Assaysmentioning

confidence: 99%

Lignification response for rolled leaves of Ctenanthe setosa under long-term drought stress

Terzi¹,

Güler²,

Caliskan³

et al. 2013

Turk J Biol

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Leaf rolling is a dehydration avoidance mechanism for plants under drought stress. To understand how it affects the lignification process in response to long-term drought stress in Ctenanthe setosa plants that have the leaf-rolling mechanism, the enzymes in lignification were studied in unrolled leaves as a control and at 2 different leaf rolling indices at days 35 and 47 of the drought period. The results indicated that the activities of phenylalanine ammonia lyase, indole-3-acetic acid oxidase, soluble peroxidase, ionically wall-bound peroxidase, covalently wall-bound peroxidase, and polyphenol oxidase were increased during long-term drought stress. However, nitrate reductase activity was decreased while lignin content was increasing during the period of drought. Lignin content was positively correlated to activities of phenylalanine ammonia lyase, indole-3-acetic acid oxidase, soluble peroxidase, ionically wall-bound peroxidase, and polyphenol oxidase, but it was negatively correlated to activity of nitrate reductase. Furthermore, there was a positive correlation between leaf rolling and lignin content. The results indicate that the leaf-rolling process may be related to the lignification mechanism in alleviating damage from stress in Ctenanthe setosa under long-term drought stress.

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“…However; it becomes toxic at high concentration. Excessive nickel strongly destroys photosynthesis and membrane function, obviously inhibits seed germination, plant growth and development and markedly decreases the yields of plants (Boominathan and Doran, 2002;Woolhouse, 1983;Pandolfini et al, 1992;Moya et al, 1993;Madhava Rao and Sresty, 2000). Soil and water contamination by heavy metals was originally restricted to metalliferous soils but has become a general problem because of anthropogenic sources including smelting of ore, electroplating and municipal sludge (Déportes et al, 1995;Barcan and Kovnatsky, 1998;Karam et al, 1998).…”

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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Nickel toxicity and peroxidase activity in seedlings of Triticum aestivum L.

Cited by 208 publications

References 26 publications

Occurrence, physiological responses and toxicity of nickel in plants

Occurrence, physiological responses and toxicity of nickel in plants

Lignification response for rolled leaves of Ctenanthe setosa under long-term drought stress

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

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