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The major limit to plant growth in acid soils is the presence of toxic aluminum (Al) cations, which inhibit root elongation. Aluminum tolerance in rye has been described as controlled by, at least, four independent and dominant loci (Alt1, Alt2, Alt3 and Alt4) located on 6RS, 3RS, 4RL and 7RS chromosome arms, respectively. Previous data have shown some discrepancies about the location of Alt3 locus that should be studied. On the one hand, the rye Alt3 locus has been assigned to 4RL because it was linked to an AFLP (AMAL4) reported to be located on that chromosome. On the other hand, this locus co-segregated with an RFLP marker (BCD1230) that was also linked to the wheat AltBH gene, located on 4DL. In our opinion these data were discrepant and require explanation. Either the map position of BCD1230 should be the first report of homology between 4DL and 4RL or there was a mistake in the assignation of Alt3 locus to 4RL. Consequently, five molecular markers (B1, B4, B11, B26 and BCD1230) that were previously described as tightly linked to the Alt3 locus on the 4RL chromosome arm were studied in wheat-rye addition lines and three F2 populations that segregate for the Alt4 locus. Our results show unequivocally that these markers are located on 7RS and closely linked to the Alt4 locus. In spite of previous data supporting the existence of an Alt locus in 4R chromosome, our study reveals that the Alt3 and Alt4 loci are in fact the same one that is located on 7RS.

Chromosomal location of molecular markers linked to aluminum tolerance genes in rye