Changes in photochemical and antioxidant enzyme activities in maize (Zea mays L.) leaves exposed to excess copper

Tanyolaç, Deniz; Ekmekçi, Yasemin; Ünalan, Şeniz

doi:10.1016/j.chemosphere.2006.09.052

Cited by 191 publications

(86 citation statements)

References 50 publications

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“…The results of this study regarding an increased SOD activity in response to excess of copper are in agreement with those obtained in oat, wheat and Arabidopsis thaliana (Alscher et al 2002, Draobzkiewicz et al 2004. Moreover, previous studies suggested that exposure to higher Cu concentrations results in a significantly decreased SOD activity (Tanyolac et al 2007); their study suggested that SOD activity is decreased in stems and roots at copper concentration of 800 µmol. Our findings suggested that SOD is involved in the oxidative stress defence Changes in CAT activity in leaves, stems and roots of seedlings under copper stress are shown in Figure 5.…”

Section: Resultssupporting

confidence: 80%

Effects of copper on growth, antioxidant enzymes and phenylalanine ammonia-lyase activities in Jatropha curcas L. seedling

Gao¹,

Yan²,

Cao³

et al. 2008

Plant Soil Environ.

116

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The effects of different concentrations of copper (0-800 µmol) on growth, protein contents, peroxidase (POD), catalase (CAT), superoxide dismutase (SOD), and phenylalanine ammonia-lyase (PAL) in Jatropha curcas L. seedlings were assessed by means of pot experiments. Results suggested that increased copper concentrations lead to decreased shoot elongation and seedling biomass. Protein content in the leaves and roots reached their highest levels at the copper concentrations of 400 µmol, while the highest protein content in the stem was observed at 800 µmol copper. POD activity in leaves and stems was unaffected at low copper concentrations, but showed a considerable variation at high copper concentrations. In roots, the highest POD activity was observed at 200 µmol copper. Under copper stress, SOD activity in leaves increased concomitantly with increasing copper up to 400 µmol, and SOD activity in stems and roots showed a slight increase. Catalase activity significantly elevated in leaves and roots but showed no significant changes in stems of the seedlings exposed to copper. A gradual increase of PAL activity in leaves and roots at the copper concentration of 400 and 200 µmol was observed, while PAL activity remained unchanged in stems.

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Section: Resultssupporting

confidence: 80%

Effects of copper on growth, antioxidant enzymes and phenylalanine ammonia-lyase activities in Jatropha curcas L. seedling

Gao¹,

Yan²,

Cao³

et al. 2008

Plant Soil Environ.

116

View full text Add to dashboard Cite

show abstract

“…Though Cu is an essential micronutrient for normal plant growth and metabolism, but it can be toxic to the plants at higher concentration (Yruela 2005). It has been reported that, excess of Cu can inhibit the growth of plant height, root elongation and causes damage to root epidermal cells (Tanyolac et al 2007;De Vos et al 1989). Based on Statistical analysis was as in Fig.…”

Section: Discussionmentioning

confidence: 99%

Copper-stress induced alterations in protein profile and antioxidant enzymes activities in the in vitro grown Withania somnifera L.

Rout

Ram

Das

et al. 2013

Physiol Mol Biol Plants

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Withania somnifera L. seedlings were grown in half-strength MS (Murashige and Skoog) basal medium for 4 weeks and then transferred to full-strength MS liquid medium for 3 weeks. The sustainable plants were subcultured in the same medium but with different concentrations (0, 25, 50, 100 and 200 μM) of Cu for 7 and 14 days. The growth parameters (root length, shoot length, leaf length and total number of leaves per plant) showed a declining trend in the treated plants in a concentration dependant manner. Roots and leaves were analyzed for protein profiling and antioxidant enzymes [catalase (CAT, EC 1.11

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“…In Hordeum vulgare L. we demonstrated that the excess of Cu 2+ inhibits the chlorophyll and carotenoids biosynthesis and impairs the incorporation of these pigments into photosystems (Caspi et al, 1999). In addition to this effect, copper competes with iron uptake because it possesses a similar assimilation pathway, as it is observed a reduction in chlorophyll content due to iron deficiency induced by excess copper (Tanyolaç et al, 2007). Copper can also replace the Mg ion at the central position in chlorophyll molecule, leading to inhibition of chlorophyll synthesis (Yruela, 2009;Boojar;Goodarzi, 2007).…”

Section: Discussionmentioning

confidence: 99%

Copper (Cu) stress affects carbon and antioxidant metabolism in Coffea arabica seedlings

Santos¹,

Fária²,

Silva³

et al. 2017

Aust J Crop Sci

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Although copper is a micronutrient essential for the normal development of plants, both insufficient and supra optimal doses can disrupt the functioning of metabolism and the production of biomass. To study the biochemical and physiological impacts of deficiency and excess of copper in coffee, we treated 6-month-old seedlings of Coffea arabica L. Catuaí cultivar to three copper treatments: control (0.03 ppm), excess (0.12 ppm) and deficiency (0 ppm) for 60 days. The changes in levels of photosynthetic pigments, biomass allocation, carbohydrate partitioning, antioxidant system and proline levels were evaluated. Under deficiency and excess of copper coffee seedlings showed lower levels of chlorophyll, reduction on dry weight of shoot, lower sugar levels and higher content of hydrogen peroxide. We also observed increased levels of proline and enzymatic activity of the antioxidant system, providing conditions for the reduction of oxidative stress triggered by nutritional imbalance. In general, the results showed that coffee plants invest in antioxidant defense system as an alternative to maintain redox balance when exposed to deficiency or excess copper. However, it is not effective to prevent an increase in lipid peroxidation. Authors may indicate an optimum range for application of copper in coffee.

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Changes in photochemical and antioxidant enzyme activities in maize (Zea mays L.) leaves exposed to excess copper

Cited by 191 publications

References 50 publications

Effects of copper on growth, antioxidant enzymes and phenylalanine ammonia-lyase activities in Jatropha curcas L. seedling

Effects of copper on growth, antioxidant enzymes and phenylalanine ammonia-lyase activities in Jatropha curcas L. seedling

Copper-stress induced alterations in protein profile and antioxidant enzymes activities in the in vitro grown Withania somnifera L.

Copper (Cu) stress affects carbon and antioxidant metabolism in Coffea arabica seedlings

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