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Caroline de Jesus Coelho, José Raulindo Gardingo, Mara Cristina de Almeida and Rodrigo Rodrigues Matiello

Abstract: The objectives of this study were to map genomic regions associated
with QTL for aluminum (Al) tolerance in maize and determine the phenotypic
effects of tolerance loci. QTL analysis for Al tolerance was carried out in a population
of F2:3 progenies resulting from a cross between the contrasting lines LT 99-4
and LS 04-2. SSR (Simple Sequence Repeat) loci and AFLP (Amplified Fragment
Length Polymorphism) were used to construct the linkage map and to detect
QTL mapped by composite interval mapping analysis. Nine tolerance QTL among
eight linkage groups (chromosomes 2, 4, 5, 6, 7, 8, 9, and 10) were mapped,
which explained 70.3% of the phenotypic variance. The results confirmed three
major QTL (bins 6.00, 8.05, and 10.01) that are described in the literature for
Al tolerance, which accounted for most of the phenotypic variance (40.3%).

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