How cobalt facilitates cadmium- and ethylene precursor-induced growth inhibition and radial cell expansion in barley root tips |
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Authors: | Katarína Valentovi?ová Igor Mistrík Veronika Zelinová Ladislav Tamás |
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Institution: | 1.Institute of Botany,Slovak Academy of Sciences,Bratislava,Slovak Republic |
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Abstract: | Significant root growth inhibition was observed during the very short 5 minute exposure time of barley roots to the low 10
μM concentration of cadmium. In addition to the cadmium-induced root growth inhibition, considerable radial expansion of roots
was observed as a characteristic symptom of transient short-term exposure of roots to cadmium. The cadmium-induced radial
expansion of roots was observed mainly the cortical cells of elongation zone that were twice as large as in control roots.
Similarly as in cadmium-treated roots, short-term treatment with ACC significantly inhibited root growth and caused a marked
radial expansion of cortical cells. The ethylene synthesis inhibitor cobalt significantly alleviated both the cadmium- and
ethylene precursor-induced root growth inhibition and radial root expansion. The results indicate that ethylene probably plays
a crucial role in the short-term cadmium-induced inhibition of root growth and radial cell expansion of barley root tips,
which are the very early symptoms of cadmium toxicity. |
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