Redistribution of cobalt and nickel in detached wheat shoots: effects of steam-girdling and of cobalt and nickel supply |
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Authors: | S Zeller U Feller |
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Institution: | (1) Institute of Plant Physiology, University of Bern, Altenbergrain 21, CH-3013 Bern, Switzerland |
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Abstract: | Detached wheat shoots (ear with peduncle and flag leaf) were incubated for 4 d in a solution containing 1 mM RbCl and 1 mM
SrCl2 as well as 10, 40 or 160 μM NiCl2 and CoCl2. The phloem of some plants was interrupted by steam-girdling the stem below
the ear to distinguish between xylem and phloem transport. The phloem-immobile Sr flowed mainly to the leaf lamina and to
the glumes via the xylem. The Sr transport was not sensitive to steam-girdling. In contrast, the phloem-mobile Rb accumulated
during the incubation time mainly in the stem and the leaf sheath. The Rb transport to the grains was impaired by steam-girdling
as well as by elevated Ni and Co concentrations in the incubation solution indicating that Rb was transported via the phloem
to the maturing grains and that this transport was affected by the heavy metals. Ni was removed more efficiently from the
xylem in the peduncle than Co (but far less efficiently than Rb). It became evident that the two heavy metals can also be
transferred from the xylem to the phloem in the stem of wheat and reach the maturing grains via the phloem.
This revised version was published online in July 2006 with corrections to the Cover Date. |
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Keywords: | phloem rubidium strontium Triticum aestivum xylem |
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