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Agronomy 2015, 5(3), 418-434;

Differences in Aluminium Accumulation and Resistance between Genotypes of the Genus Fagopyrum

Aglukon Spezialdünger GmbH & Co. KG, Düsseldorf
Institute of Plant Nutrition, Leibniz Universität Hannover, Germany
Author to whom correspondence should be addressed.
Academic Editor: Gareth Norton
Received: 22 June 2015 / Revised: 20 July 2015 / Accepted: 20 August 2015 / Published: 28 August 2015
(This article belongs to the Special Issue Accumulation and Distribution of Elements in Crop Plants)
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Aluminium (Al) toxicity is a major factor reducing crop productivity worldwide. There is a broad variation in intra- and inter-specific Al resistance. Whereas the Al resistance mechanisms have generally been well explored in Al-excluding plant species, Al resistance through Al accumulation and Al tolerance is not yet well understood. Therefore, a set of 94 genotypes from three Fagopyrum species with special emphasis on F. esculentum Moench were screened, with the objective of identifying genotypes with greatly differing Al accumulation capacity. The genotypes were grown in Al-enriched peat-based substrate for 21 days. Based on the Al concentration of the xylem sap, which varied by a factor of five, only quantitative but not qualitative genotypic differences in Al accumulation could be identified. Aluminium and citrate and Al and Fe concentrations in the xylem sap were positively correlated suggesting that Fe and Al are loaded into and transported in the xylem through related mechanisms. In a nutrient solution experiment using six selected F. esculentum genotypes differing in Al and citrate concentrations in the xylem sap the significant correlation between Al and iron transport in the xylem could be confirmed. Inhibition of root elongation by Al was highly significantly correlated with root oxalate-exudation and leaf Al accumulation. This suggests that Al-activated oxalate exudation and rapid transport of Al to the shoot are prerequisites for the protection of the root apoplast from Al injury and thus overall Al resistance and Al accumulation in buckwheat. View Full-Text
Keywords: aluminum; buckwheat; citrate translocation; genotypic differences; oxalate exudation; tolerance aluminum; buckwheat; citrate translocation; genotypic differences; oxalate exudation; tolerance

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Klug, B.; Kirchner, T.W.; Horst, W.J. Differences in Aluminium Accumulation and Resistance between Genotypes of the Genus Fagopyrum. Agronomy 2015, 5, 418-434.

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