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Article: Organic anions in the rhizosphere of Al-tolerant and Al-sensitive wheat lines grown in an acid soil in controlled and field environments.(Report)
- Article from:
- Australian Journal of Soil Research
- Article date:
- May 1, 2008
- Author:
CopyrightCOPYRIGHT 2008 CSIRO Publishing. This material is published under license from the publisher through the Gale Group, Farmington Hills, Michigan. All inquiries regarding rights should be directed to the Gale Group. (Hide copyright information)
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Introduction
Aluminium (Al) toxicity at low soil pH is a major problem in much of the arable land around the world (von Uexkull and Mutert 1995). Plants have a suite of mechanisms to deal with this hostile soil condition, including exudation of organic anions from roots (Ryan et al. 2001). An example of this mechanism has been intensively studied in the near-isogenic lines of wheat ET8 and ES8 (>95% genetic similarity, differing in the Altl locus) (Fisher and Scott 1983; Delhaize et al. 1993, 2004). ET8, the tolerant line, releases high concentrations of malate from the root tips in the presence of Al, which is thought to complex with monomeric [Al.sup.3+] within ...
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