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Type: Journal article
Title: Redistribution of boron in leaves reduces boron toxicity
Author: Reid, R.
Fitzpatrick, K.
Citation: Plant Signaling and Behavior, 2009; 4(11):1091-1093
Publisher: Landes Bioscience
Issue Date: 2009
ISSN: 1559-2316
Statement of
Robert Reid and Kate L. Fitzpatrick
Abstract: High soil boron (B) concentrations lead to the accumulation of B in leaves, causing the development of necrotic regions in leaf tips and margins, gradually extending back along the leaf. Plants vary considerably in their tolerance to B toxicity, and it was recently discovered that one of the tolerance mechanisms involved extrusion of B from the root. Expression of a gene encoding a root B efflux transporter was shown to be much higher in tolerant cultivars. In our current research we have shown that the same gene is also upregulated in leaves. However, unlike in the root, the increased activity of the B efflux transporter in the leaves cannot reduce the tissue B concentration. Instead, we have shown that in tolerant cultivars, these transporters redistribute B from the intracellular phase where it is toxic, into the apoplast which is much less sensitive to B. These results provide an explanation of why different cultivars with the same leaf B concentrations can show markedly different toxicity symptoms. We have also shown that rain can remove a large proportion of leaf B, leading to significant improvements of growth of both leaves and roots.
Keywords: Hordeum
Plant Leaves
Plant Roots
Membrane Transport Proteins
Adaptation, Physiological
Plant Diseases
Gene Expression
Biological Transport
Genes, Plant
DOI: 10.4161/psb.4.11.9798
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Appears in Collections:Aurora harvest
Earth and Environmental Sciences publications

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