How cobalt facilitates cadmium- and ethylene precursor-induced growth inhibition and radial cell expansion in barley root tips
Central European Journal of Biology(2012)
摘要
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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关键词
Cadmium, Cobalt, Root growth inhibition, Swollen roots
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