Magnesium antagonizes Pod-Zone calcium and zinc uptake by developing peanut pods

Zharare, G. E., Asher, C. J. and Blamey, F. P. C. (2011) Magnesium antagonizes Pod-Zone calcium and zinc uptake by developing peanut pods. Journal of Plant Nutrition, 34 1: 1-11. doi:10.1080/01904167.2011.531354

Author Zharare, G. E.
Asher, C. J.
Blamey, F. P. C.
Title Magnesium antagonizes Pod-Zone calcium and zinc uptake by developing peanut pods
Journal name Journal of Plant Nutrition   Check publisher's open access policy
ISSN 0190-4167
Publication date 2011-01-01
Year available 2010
Sub-type Article (original research)
DOI 10.1080/01904167.2011.531354
Volume 34
Issue 1
Start page 1
End page 11
Total pages 11
Publisher Taylor & Francis
Language eng
Formatted abstract
Excess soil magnesium (Mg) is thought to adversely affect peanut (Arachis hypogaea L.) pod development by inhibiting calcium (Ca) uptake by peanut pods from the pod-zone. A solution culture experiment was therefore conducted to examine the effect of magnesium sulfate (MgSO4.7H2O) concentration (0 to1000 μM) in a simplified pod-zone solution containing (μM); ca. 101 sulfur (S), 100 Ca, 0.5 zinc (Zn), and 4 iron (Fe) on Mg and Ca absorption by developing pods in three peanut lines. There was a net Mg influx into pods from all solutions that contained Mg. The net Mg influx increased as the solution Mg concentration increased, and was accompanied by decreasing Ca influx into the pods which culminated into a net Ca efflux in the treatment with the highest solution Mg concentration (1000 μM). The pods released substantial amounts of root-absorbed potassium (K) into the pod-zone, the amount of which differed among the lines and with the Mg concentration in the pod zone. The concentration of Mg and S in the pod walls and of Mg (but not S) in the seeds increased strongly with increasing Mg and S concentration in the pod culture solution. This was accompanied by decreasing Ca and Zn concentration in the pod walls and seeds. Thus, the study provided direct evidence for the antagonism of Mg on Ca and Zn absorption from the pod-zone by developing peanut pods.
© Copyright 2010 Elsevier B.V., All rights reserved.

Keyword Calcium
Peanut pods
Solution culture
Q-Index Code C1
Q-Index Status Confirmed Code
Institutional Status UQ
Additional Notes Online publication date: 01 December 2010

Document type: Journal Article
Sub-type: Article (original research)
Collections: Official 2011 Collection
School of Agriculture and Food Sciences
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Citation counts: TR Web of Science Citation Count  Cited 5 times in Thomson Reuters Web of Science Article | Citations
Scopus Citation Count Cited 5 times in Scopus Article | Citations
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Created: Sun, 02 Jan 2011, 10:10:33 EST