Responses to Fe deficiency in roots of “Fe‐efficient” plant species

Römheld, Volker and Marchner, H and Kramer, D (1982) Responses to Fe deficiency in roots of “Fe‐efficient” plant species. Journal of plant Nutrition, 5 (4-7). pp. 489-498.

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Under Fe deficiency ("Fe stress") the roots of so‐called “Fe‐efficient” plant species (mainly dicots and some monocots) show typical responses, such as increased formation of root hairs, development of rhizoder‐mal transfer cells, and increased capacity to reduce Fe‐III in the rhizodermis: simultaneously the uptake rate of Fe increases rapidly. Fe deficiency also enhances the uptake rates of Mn and Zn, although to lower levels than for Fe uptake. Thus, these responses to Fe deficiency also have a favourable effect on the Mn and Zn nutritional status of those plant species grown on substrates with low Fe availability. In contrast to “Fe‐efficient” species, in the so‐called “Fe‐inefficient” species (mainly grasses) these responses for the fine regulation of Fe uptake are absent. Bicarbonate severly inhibits the reducing capacity of roots in “Fe‐efficient” species under Fe deficiency. Furthermore, with low Fe availability in the substrate, Fe uptake and chlorophyll formation are both more inhibited by bicarbonate in “Fe‐efficient” than “Fe‐ineffi‐cient” species. This different effects of bicarbonate might be at least one explanation for the discrepancy often observed between “Fe efficiency” and “chlorosis resistance” of a certain species.

Item Type: Article
Uncontrolled Keywords: Fe efficiency, chlorosis resistance, transfer cells, Fe uptake mechanism, bicarbonate, Mn and Zn uptake
Author Affiliation: a Institut für Pflanzenernahrung, Universität Hohen‐heim, Postfach 700562, Stuttgart 70, D‐7000, West‐Germany b Institut für Botanik, Technische Hochschule Darmstadt, Schnittspahnstr.3, Darmstadt, D‐6100, West‐Germany
Subjects: Plant Protection
Crop Improvement
Depositing User: Library ICRISAT-InfoSAT
Date Deposited: 31 Mar 2012 10:29
Last Modified: 31 Mar 2012 10:30
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