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Plant Biol (Stuttg) 2002; 4(2): 193-204
DOI: 10.1055/s-2002-25730
Review Article
Georg Thieme Verlag Stuttgart ·New York

Update on Boron in Higher Plants - Uptake, Primary Translocation and Compartmentation

F. Dannel, H. Pfeffer, V. Römheld
  • Institut für Pflanzenernährung (330), Universität Hohenheim, Stuttgart, Germany
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Publication History

August 1, 2001

December 7, 2001

Publication Date:
26 April 2002 (online)

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Abstract

This review focuses on the uptake and primary translocation of boron (B), as well as on the subcellular compartmentation of B and its role in cell walls of higher plants. B uptake occurs via passive diffusion across the lipid bilayer, facilitated transport through major intrinsic proteins (MIPs), and energy-dependent transport through a high affinity uptake system. Whereas the first two represent passive uptake systems, which are constitutively present, the latter is induced by low B supply and is able to establish a concentration gradient for B between the root symplasm and the external medium. At high B supply, a substantial retention of B can be observed at xylem loading, and passive processes are most likely responsible for that. At low B supply, another energy-dependent high affinity transport system for B seems to be induced which establishes an additional concentration gradient between root symplasm and the xylem. The possible significance of all these processes at various B supplies is discussed. The role of soluble B complexes in uptake and primary translocation of B has been evaluated, but the few data available do not allow comprehensive conclusions to be drawn. In any case, there are no indications that soluble B complexes play a major role in either uptake or primary translocation of B. The subcellular compartmentation of B still remains a matter of controversy, but it is unequivocally clear that B is present in all subcellular compartments (apoplasm, cell wall, cytosol and vacuole). The relative distribution of B between these is dependent on plant species and experimental conditions and may vary greatly. Recent results on the well-established role of B in cell walls are summarized and their physiological significance discussed.

Key words

Boron - cell wall - compartmentation - complexes - translocation - uptake

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F. Dannel

Institut für Pflanzenernährung (330)
Universität Hohenheim

70593 Stuttgart
Germany

Email: plantnut@uni-hohenheim.de

Section Editor: U. Lüttge

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