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GrainGenes Reference Report: GNM-48-781

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Reference	GNM-48-781
Title	Molecular characterization and mapping of ALMT1, the aluminium-tolerance gene of bread wheat (Triticum aestivum L.).
Journal	Genome
Year	2005
Volume	48
Pages	781-791
Author	[ Hide all but 1 of 19 ] Raman H Zhang K Cakir M Appels R Garvin DF Maron LG Kochian LV Moroni JS Raman R Imtiaz M Drake-Brockman F Waters I Martin P Sasaki T Yamamoto Y Matsumoto H Hebb DM Delhaize E Ryan PR
Abstract	The major aluminum (M) tolerance gene in wheat ALMTI confers an Al-activated efflux of malate from root apices. We determined the genomic structure of the ALMTI gene and found it consists of 6 exons interrupted by 5 introns. Sequencing a range of wheat genotypes identified 3 alleles for ALMT1. I of which was identical to the ALMT1 gene from an Aegilops tauschii accession. The ALMT1 gene was mapped to chromosome 4DL using 'Chinese Spring' deletion lines, and loss of ALMT1 coincided with the loss of both Al tolerance and Al-activated malate efflux. Aluminium tolerance in each of 5 different doub led-haploid populations was found to be conditioned by a single major gene. When ALMT1 was polymorphic between the parental lines, QTL and linkage analyses indicated that ALMT1 mapped to chromosome 4DL and cosegregated with Al tolerance. In 2 populations examined. Al tolerance also segregated with a greater capacity for Al-activated rnalate efflux. Aluminium tolerance was not associated with a particular coding allele for ALMT1, but was significantly correlated with the relative level of ALMT1 expression. These findings suggest that the Al tolerance in a diverse range of wheat genotypes is pri marily conditioned by ALMT1.
External Databases	https://doi.org/10.1139/g05-054
Gene	Alt2 (Triticum)
Locus	Alt2

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