Molecular markers linked to the aluminium tolerance gene Alt1 in rye (Secale cereale L.)

Rye has one of the most efficient group of genes for aluminium (Al) toleran ce among cultivated species of Triticeae. This tolerance is controlled by a t least two independent and dominant loci (Alt1 and Aln) located on chromos omes 6RS and 4R. We used two pooled DNA samples, one of Al-tolerant individ uals and another of Al-sensitive plants from one F-2 that segregated for th e Alt1 locus. We also used two pooled DNA samples, one with genotypes II an d another with genotypes 22 for the Lap1 locus (leucin aminopeptidase) from another F-2 progeny that segregated for this locus, located on the 6RS chr omosome arm. We identified several RAPD markers associated with the pooled Al-tolerant plants and also with one of the bulks for the Lap1 locus. The R APD fragments linked to Alt1 and Lap1 genes were transformed into SCAR mark ers to confirm their chromosomal location and linkage data. Two SCARs (ScR0 1(600) and ScB15(7900)) were closely linked to the Alt1 locus, ScR01(600) l ocated 2.1 cM from Alt1 and ScB15(790) located 5.5 cM from Alt1, on the 6RS chromosome arm. These SCAR markers can aid in the transfer of Al tolerance genes into Al-sensitive germplasms.