Cadmium induces premature xylogenesis in barley roots |
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Authors: | Katarína Ďurčeková Jana Huttová Igor Mistrík Marta Ollé Ladislav Tamás |
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Institution: | (1) Institute of Botany, Slovak Academy of Sciences, Dúbravská cesta 14, SK-84523 Bratislava, Slovak Republic |
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Abstract: | The effect of Cd on H2O2 production, peroxidase (POD) activity and root hair formation were analyzed in barley root. Cd causes a strong H2O2 burst in the root region 0–6 mm behind the root tip. POD activity was activated in root tip and raised toward the root base
in Cd treated roots. In situ analyses showed that both elevated H2O2 production and POD activity are localized in the early metaxylem vascular bundles. Cd induces root hair formation in the
region 2 to 4 mm behind the root tip that was not detected in control roots. These results suggest that Cd-induced root growth
inhibition is at least partially the consequence of Cd-stimulated premature root development involving xylogenesis and root
hair formation, which is correlated with shortening of root elongation zone and therefore with root growth reduction. |
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Keywords: | Cadmium Hydrogen peroxide Lignification Peroxidase Root growth Root hair |
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