Volume 37, Number C1, February 2002ECORAD 2001: The Radioecology - Ecotoxicology of Continental and Estuatine Environments
|Page(s)||C1-503 - C1-508|
|Published online||14 October 2009|
Transfer of calcium-45 and strontium-90 from medium to plant and their translocation in micropropagated potato
Macdonald Campus, McGill University, Department of Natural Resource Sciences, H9X 3V9 Sainte-Anne-de-Bellevue, Quebec, Canada
The uptake and translocation of calcium-45 and strontium-90 were studied in potato (Solanum tuberosum) cv. Sierra micropropagated plantlets and cv. Norland microtubers. The absorption of Ca-45 or Sr-90 by plantlets was not significant as the concentrations of either CaCl2 or SrCl2 were increased in the treatment solution. However, the percentage uptake of Ca-45 decreased with increasing concentration of these salts. Uptake by roots, stems, petioles, and leaves differed significantly (p < 0.05) regardless of salt concentration. When shoot-tips were immersed in the treatment solutions containing various concentrations of these salts for 161 h while the plantlets were held in a vertically inverted position, considerable amounts of radiolabel were still translocated towards the roots. The Ca-45/Sr-90 ratio assumed a wide range of values as equal amounts of each radioisotope were fed either through root- or tip-immersion. A differential uptake and translocation between the isotopes occurred for the plantlets independent of feeding mechanism. A drop of Ca-45 or Sr-90 (18.5 kBq) onto the periderm of microtubers was restricted in movement to the periderm with virtually no penetration into the inner cortical or medulary tissues. The diffusion coefficient of Sr-90 on the periderm of Norland microtubers was estimated at 6.5 x 10-8 cm2/s.
© EDP Sciences, 2002
Current usage metrics show cumulative count of Article Views (full-text article views including HTML views, PDF and ePub downloads, according to the available data) and Abstracts Views on Vision4Press platform.
Data correspond to usage on the plateform after 2015. The current usage metrics is available 48-96 hours after online publication and is updated daily on week days.
Initial download of the metrics may take a while.