Effect of heavy metals on root growth and peroxidase activity in barley root tip

Halušková, Ľubica; Valentovičová, Katarína; Huttová, Jana; Mistrı́k, Igor; Tamás, Ladislav

doi:10.1007/s11738-009-0377-1

Cited by 29 publications

(15 citation statements)

References 47 publications

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“…'Virginia' agrees with other authors' results for different species (Kaplan et al, 1990;Wang et al, 2008;Olness et al, 2005;Potters et al, 2007). The increased thickness and shorter length of the roots are symptoms of vanadium toxicity (Morrell et al, 1986;Martín and Saco, 1995;Potters et al, 2007); this decrease in root growth may be due to an increase in wall lignification as a defence mechanism (Halusková et al, 2010). The symptoms and growth values obtained suggest than these vanadium doses, 40 μM and 80 μM, may be toxic for N. tabacum plants, and that the highest dose may be near the toxicity threshold.…”

Section: Discussionsupporting

confidence: 89%

Some Responses of TwoNicotiana tabacumL. Cultivars Exposed to Vanadium

Sánchez

Martín

Saco

2014

Journal of Plant Nutrition

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2 The effect of exposure to different vanadium (V) concentrations was studied in Nicotiana tabacum L. (cv. 'Burley' and cv. 'Virginia'). In both cultivars, the vanadium did not affect the percentage of germination but root and shoot growth was inhibited, especially with the 80 μM dose. An altered root morphogenesis in vanadium growth plants was observed at the end of the experiment. The highest V accumulation was found in roots and the results showed a direct correlation between V content and V supply (P ≤ 0.01). The V concentrations did not modify nicotine content in the cv. 'Burley', but in the cv. 'Virginia' the highest nicotine content was found in vanadium exposed plants (P ≤ 0.05). The results suggest that these V concentrations may have a possible elicitor effect on alkaloid synthesis in N. tabacum L. cv. 'Virginia', and that this cultivar has a higher V sensitivity than the cv. 'Burley'.

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Section: Discussionsupporting

confidence: 89%

Some Responses of TwoNicotiana tabacumL. Cultivars Exposed to Vanadium

Sánchez

Martín

Saco

2014

Journal of Plant Nutrition

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“…Silicon supply slightly increased GPX activity at normal Mn, but significantly decreased its activity at excess Mn (Shi et al 2005). Analysis of the individual root segments of barley revealed that all of the analyzed metals (Cd, Cu, Hg, Ni, Pb) caused an increase of GPX activity, however to a different extent and spatial distribution (Halušková et al 2010). In the study published by Song et al (2011), activities of antioxidant enzymes (SOD, CAT and APX) were increased in Si supplied plants of both Zn-sensitive and Zn-resistant rice cultivars exposed to 2 mM of Zn, which confirms alleviative effects of Si in rice.…”

Section: Discussionmentioning

confidence: 96%

Effect of silicon application on Sorghum bicolor exposed to toxic concentration of zinc

et al. 2012

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The aim of this study was to determine the effect of exogenously applied Si on the growth and physiological parameters of sorghum [Sorghum bicolor (L.) Moench] cultivated in hydroponics with elevated zinc concentrations (75 µM and 150 µM Zn). Increased concentrations of Zn inhibited root growth and biomass production of roots and shoots. Application of Si individually showed a positive effect on root growth but negatively affected production of fresh and dry biomass of roots and shoots. On the other hand, silicon in combination with Zn significantly reduced the inhibitory effect of Zn on root growth but did not positively affect biomass production of roots and shoots. Accumulation of Zn in plant tissues increased with increasing Zn concentration in nutrient solution, but application of Si in combination with Zn did not significantly influence Zn accumulation in roots. Completely opposite results were found in Si accumulation in roots treated with Si in combination with Zn. Interaction of these ions resulted in considerable increase of Si accumulation in roots which almost doubled in comparison to individal Si treatment. Impact of Zn on the activity of some antioxidant enzymes was equivocal and differences were observed also between two Zn concentrations. Individual application of Si resulted in significant increase in the activity of all studied antioxidant enzymes but Si in combination with Zn mostly negatively affected their activity except the activity of catalase (CAT) which was the highest in roots grown in solution containing both Si and Zn ions. Comparing all obtained data we can assume that Si applied in combination with Zn did not significantly alleviate Zn toxicity in young sorghum except the growth of primary seminal root and further experiments are required for better understanding of their interaction.

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“…peroxidases, catalases, superoxide dismutases etc.] (Halušková et al 2010) and by accumulation of compounds that enhance chelatation or sequestration of metals (e.g. organic acids, phytochelatins (PCs) or metallothioneins) (Cobbett and Goldsbrough 2002).…”

Section: Introductionmentioning

confidence: 99%

Variable responses of soybean chitinases to arsenic and cadmium stress at the whole plant level

et al. 2014

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Plant chitinases (EC 3.2.1.14) are considered as typical defense components under various environmental stresses, including heavy metals. In addition, some of them play crucial role in normal plant growth and development. In this work the profile and activities of these enzymes were analyzed to study the variability of defense within soybean plants. For this, two cultivars with contrasting tolerance to metals were exposed to ecologically relevant doses of arsenic and cadmium. Enzyme profiles revealed a spatial distribution of chitinase activities throughout the individual plants, tending to decrease upwards to the top of the plants. Under metal stress, there was a single responsive isoform detected in roots that behaved opposingly in the studied soybean cultivars. In contrast, several isoforms were activated in aboveground tissue, predominantly in mature (older) leaves. Of these, two were identified (21 and 42 kDa) as more specifically involved in defense against metal stress in soybean. The 21 kDa isoform was concluded as possibly contributing to metal tolerance and deserves further investigations at molecular level. Nevertheless, no sound interaction was detected between leaf developmental stage and responsiveness to metals for either of the chitinase isoforms. Further studying the distribution of induced defense within plants is important in understanding the defense strategy of plants against environmental cues including metals.

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Effect of heavy metals on root growth and peroxidase activity in barley root tip

Abstract: In the present work, we investigated the alteration of oxidative and peroxidative activities of peroxidases (PODs) along the longitudinal root axis of barley seedlings during heavy metal (HM; e.g.

Cited by 29 publications

References 47 publications

Some Responses of TwoNicotiana tabacumL. Cultivars Exposed to Vanadium

Some Responses of TwoNicotiana tabacumL. Cultivars Exposed to Vanadium

Effect of silicon application on Sorghum bicolor exposed to toxic concentration of zinc

Variable responses of soybean chitinases to arsenic and cadmium stress at the whole plant level

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