Molecular mapping of quantitative trait loci (QTLs) controlling aluminium tolerance in bread wheat |
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| Authors: | S Navakode A Weidner U Lohwasser M S Röder A Börner |
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| Institution: | (1) Leibniz Institute of Plant Genetics and Crop Plant Research (IPK), Corrensstr.3, 06466 Gatersleben, Germany |
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| Abstract: | Aluminium (Al) toxicity is a major constraint to crop productivity in acidic soils. A quantitative trait locus (QTL) analysis
was performed to identify the genetic basis of Al tolerance in the wheat cultivar ‘Chinese Spring’. A nutrient solution culture
approach was undertaken with the root tolerance index (RTI) and hematoxylin staining method as parameters to assess the Al
tolerance. Using a set of D genome introgression lines, a major Al tolerance QTL was located on chromosome arm 4DL, explaining
31% of the phenotypic variance present in the population. A doubled haploid population was used to map a second major Al tolerance
QTL to chromosome arm 3BL. This major QTL (Qalt
CS
.ipk-3B) in ‘Chinese Spring’ accounted for 49% of the phenotypic variation. Linkage of this latter QTL to SSR markers opens the possibility
to apply marker-assisted selection (MAS) and pyramiding of this new QTL to improve the Al tolerance of wheat cultivars in
breeding programmes. |
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| Keywords: | Aegilops tauschii Aluminium tolerance Introgression QTL analysis SSR marker Triticum aestivum |
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