Electronic Resource
Oxford, UK
:
Blackwell Publishing Ltd
Physiologia plantarum
98 (1996), S. 0
ISSN:
1399-3054
Source:
Blackwell Publishing Journal Backfiles 1879-2005
Topics:
Biology
Notes:
Changes in root-associated Fe(III) reductase activity and Fe concentration during recovery from temporary iron starvation were investigated in hydroponically grown Plantago lanceolata L. Within two days, interruption of the Fe supply resulted in enhanced rates of reduction by intact plant roots. Transfer of iron deficient plants to a solution containing various amounts of chelated Fe caused a transient increase in reduction activity before the rates declined to a level determined by the amount of Fe added. Repression of root-associated redox activity was independent of the Fe concentration in the preculture. When iron deficient plants were submitted to a supply of Fe localized to a part of the root system (split-root plants), the decrease in reduction rates was much more pronounced in the Fe-deprived portion of the roots than in the Fe-supplied one. No correlation was observed between root Fe concentration and Fe(III) reductase activity. Continued growth of split-root plants in the +Fe/-Fe regime increased the reduction rates of the +Fe-grown portion of the root system over the rates in iron sufficient plants with non-divided roots. The results are discussed in relation to putative factors mediating intra- and interorgan regulation of iron nutrition.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1111/j.1399-3054.1996.tb05715.x
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