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Mapping of quantitative resistance loci against Puccinia psidii Winter in a full-sib progeny of Eucalyptus In Brazil, the eucalyptus rust, caused by Puccinia psidii Winter, stands out as the most important disease of eucalypts, mainly in southeast ern Brazil. The use of resistant genotypes is the main control method, which makes the understand ing of the genetic basis of resistance essential to the selection of resistant genotypes. In this study, an F 1 progeny of 90 plants was used to identify markers linked to resistance genes to t his pathogen. Four disease severity assessments were conducted during an epidemic with a diagrammat ic scale and the data were used to calculate the area under the disease progress curve (AUDPC) f or each plant. The experimental design consisted of incomplete blocks in two environments. AUDPC values were analyzed using mixed models, excluding the environmental variation betwe n locations. A genetic map was constructed based on microsatellite, AFLP and TRAP markers base d on a multipoint analysis. QTL mapping was done based on two approaches: interval mapping (IM) and composite interval mapping (CIM). The linkage map consisted of 117 microsatell ite, 10 AFLP and 33 TRAP markers, placed over 11 linkage groups, totalizing 1075 cM with an average distance of 6.7 cM between markers. IM analysis identified a QTL (LOD = 7.7) on linkage group 3, accounting for 28.5% of the phenotypic variation in AUDPC. The CIM analysis det ected two QTL, both on linkage group 3. The position of the first QTL coincided with that o f the QTL identified in the IM analysis, but with a higher LOD (10.3), accounting for 39.5% of t he variation. The second QTL (LOD = 3.4), whose maximum probability value was placed 39.0 cM away from the first QTL, accounted for 6.9% of the phenotypic variation. The resistance al l les in the two QTL are linked in repulsion with negative additive effect ( α =0.60) and lack of dominance in the first QTL an d positive additive effects ( α=0.29) and complete dominance ( δ=-0.23) in the second. The markers linked to the two QTL have potential use in assisted selectio n, hus increasing the efficiency of selection of resistant genotypes.

Mapeamento de locos de resistência quantitativa a Puccinia psidii Winter em uma progênie de irmãos completos de eucalipto