Toxic Effect of Nickel (Ni) on Growth and Metabolism in Germinating Seeds of Sunflower (Helianthus annuus L.)

Ashraf, Muhammad; Sadiq, Rumana; Hussain, Mumtaz; Ashraf, Muhammad; Ahmad, Muhammad Sajid Aqeel

doi:10.1007/s12011-011-8955-7

Cited by 48 publications

(27 citation statements)

References 29 publications

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“…Decrease of protein concentration in leaves with increasing Ni concentration in external solution was observed for both cultivars. These findings agree with earlier studies carried out with pea [29], Cunonia macrophylla [30] and sunflower [31]. The highest applied Ni concentration 120 µmol · dm -3 caused the decrease of protein concentration in leaves by 39% (cv.…”

Section: Resultssupporting

confidence: 92%

Physiological response of two brassica napus l. cultivars to nickel treatment

Peško

Kráľová

2014

Ecological Chemistry and Engineering S

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PHYSIOLOGICAL RESPONSE OF TWO Brassica napus L. CULTIVARS TO NICKEL TREATMENT WPŁYW NIKLU NA REAKCJE FIZJOLOGICZNE DWÓCH ODMIAN Brassica napus L.Abstract: Adverse effect of nickel on hydroponically cultivated plants of two Brasssica napus L. cultivars (Verona and Viking) was investigated. Dry mass of shoots and roots as well as some biochemical characteristics (concentration of photosynthetic pigments, TBARS and proteins) of plant leaves were determined. In addition, the content of nickel in plant organs was estimated. Visible symptoms of Ni toxicity were notable already at the lowest applied concentration (6 µmol · dm -3). Higher applied Ni concentrations (24, 60 and 120 µmol · dm -3 ) resulted in moderate to strong toxic effects on plants of both studied cultivars. After application of 6 and 12 µmol · dm -3 Ni shoot dry mass of cv. Viking was substantial lower than that of cv. Verona. Decrease of root dry mass after treatment with 6, 12 and 120 µmol · dm -3 Ni was similar for both cultivars. Strong decrease in content of photosynthetic pigments was observed after application of 120 µmol · dm . Comparing to the control, the content of these pigments in leaves of plants dropped under 50% (both cultivars). The highest applied Ni concentration 120 µmol · dm -3 caused that protein content in leaves dropped by 39% (cv. Verona) and 37% (cv. Viking) comparing to the control plants. After application of 120 µmol · dm -3 Ni the content of malondialdehyde in leaves was 2.64-(Viking) and 2.31-(Verona) times higher than that of control. Nickel amounts accumulated in roots of plants were higher than those in shoots. Accumulated Ni amounts in roots of cv. Verona plants were 1.3-(120 µmol · dm -3 ) to 1.9-(6 µmol · dm -3 ) times lower than those of cv. Viking plants, whereas metal amounts accumulated in shoots of cv. Verona plants were 1.2-(120 µmol · dm -3 ) to 1.8-(6 µmol · dm -3 ) times lower than those of cv. Viking plants.

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Section: Resultssupporting

confidence: 92%

Physiological response of two brassica napus l. cultivars to nickel treatment

Peško

Kráľová

2014

Ecological Chemistry and Engineering S

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“…Toxic metals in high concentrations have been reported to progressively inhibit the early phases of seed germination. This also affects the reactivation of oxygen, changes in metabolic energy and the mobilization of sugars and phosphoro-organic compounds, along with changes in protein synthesis in seeds during germination [66][67][68]. All of these toxic metals at high concentrations in soil can inhibit germination, plant growth, chlorophyll production, reduce the germination rate and suppress yield, probably due to the toxic effects of various metabolic processes [69,70].…”

Section: Seasonal Dependency On Soil Toxic Metals' Determinationmentioning

confidence: 99%

Digital Mapping of Toxic Metals in Qatari Soils Using Remote Sensing and Ancillary Data

Kheir

Adhikari

et al. 2016

Remote Sensing

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After decades of mining and industrialization in Qatar, it is important to estimate their impact on soil pollution with toxic metals. The study utilized 300 topsoil (0-30 cm) samples, multi-spectral images (Landsat 8), spectral indices and environmental variables to model and map the spatial distribution of arsenic (As), chromium (Cr), nickel (Ni), copper (Cu), lead (Pb) and zinc (Zn) in Qatari soils. The prediction model used condition-based rules generated in the Cubist tool. In terms of R 2 and the ratio of performance to interquartile distance (RPIQ), the models showed good predictive capabilities for all elements. Of all of the prediction results, Cu had the highest R 2 = 0.74, followed by As > Pb > Cr > Zn > Ni. This study found that all of the models only chose images from January and February as predictors, which indicates that images from these two months are important for soil toxic metals' monitoring in arid soils, due to the climate and the vegetation cover during this season. Topsoil maps of the six toxic metals were generated. The maps can be used to prioritize the choice of remediation measures and can be applied to other arid areas of similar environmental/socio-economic conditions and pollution causes.

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“…This breakdown and mobilization of storage reserves is controlled mainly by a-and b-amylases (both for starch digestion) and protease (protein digestion) (Bishnoi et al 1993a;Ashraf et al 2011). These enzymes are activated in germinating seeds soon after imbibition takes place, and they support the respiratory requirements of the actively growing shoot and root apices (Leon et al 2005;Maheshwari and Dubey 2008).…”

Section: Amylase and Protease Activitiesmentioning

confidence: 99%

Essential Roles and Hazardous Effects of Nickel in Plants

Ahmad

Ashraf²

2011

Reviews of Environmental Contamination and Toxicology

Self Cite

140

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With the world's ever increasing human population, the issues related to environmental degradation of toxicant chemicals are becoming more serious. Humans have accelerated the emission to the environment of many organic and inorganic pollutants such as pesticides, salts, petroleum products, acids, heavy metals, etc. Among different environmental heavy-metal pollutants, Ni has gained considerable attention in recent years, because of its rapidly increasing concentrations in soil, air, and water in different parts of the world. The main mechanisms by which Ni is taken up by plants are passive diffusion and active transport. Soluble Ni compounds are preferably absorbed by plants passively, through a cation transport system; chelated Ni compounds are taken up through secondary, active-transport-mediated means, using transport proteins such as permeases. Insoluble Ni compounds primarily enter plant root cells through endocytosis. Once absorbed by roots, Ni is easily transported to shoots via the xylem through the transpiration stream and can accumulate in neonatal parts such as buds, fruits, and seeds. The Ni transport and retranslocation processes are strongly regulated by metal-ligand complexes (such as nicotianamine, histidine, and organic acids) and by some proteins that specifically bind and transport Ni. Nickel, in low concentrations, fulfills a variety of essential roles in plants, bacteria, and fungi. Therefore, Ni deficiency produces an array of effects on growth and metabolism of plants, including reduced growth, and induction of senescence, leaf and meristem chlorosis, alterations in N metabolism, and reduced Fe uptake. In addition, Ni is a constituent of several metallo-enzymes such as urease, superoxide dismutase, NiFe hydrogenases, methyl coenzyme M reductase, carbon monoxide dehydrogenase, acetyl coenzyme-A synthase, hydrogenases, and RNase-A. Therefore, Ni deficiencies in plants reduce urease activity, disturb N assimilation, and reduce scavenging of superoxide free radical. In bacteria, Ni participates in several important metabolic reactions such as hydrogen metabolism, methane biogenesis, and acetogenesis. Although Ni is metabolically important in plants, it is toxic to most plant species when present at excessive amounts in soil and in nutrient solution. High Ni concentrations in growth media severely retards seed germinability of many crops. This effect of Ni is a direct one on the activities of amylases, proteases, and ribonucleases, thereby affecting the digestion and mobilization of food reserves in germinating seeds. At vegetative stages, high Ni concentrations retard shoot and root growth, affect branching development, deform various plant parts, produce abnormal flower shape, decrease biomass production, induce leaf spotting, disturb mitotic root tips, and produce Fe deficiency that leads to chlorosis and foliar necrosis. Additionally, excess Ni also affects nutrient absorption by roots, impairs plant metabolism, inhibits photosynthesis and transpiration, and causes ultrastructural modificat...

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Toxic Effect of Nickel (Ni) on Growth and Metabolism in Germinating Seeds of Sunflower (Helianthus annuus L.)

Cited by 48 publications

References 29 publications

Physiological response of two brassica napus l. cultivars to nickel treatment

Physiological response of two brassica napus l. cultivars to nickel treatment

Digital Mapping of Toxic Metals in Qatari Soils Using Remote Sensing and Ancillary Data

Essential Roles and Hazardous Effects of Nickel in Plants

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