Abstract
In Brazil the rust caused by Puccinia psidii Winter stands out as the most important disease of eucalyptus. The use of resistant genotypes is the main control method, which makes the detection of markers linked to rust resistance essential to the selection of resistant genotypes. In this study, an F1 progeny of 131 plants from interspecific crossings of Eucalyptus was used to identify markers linked to resistance genes for this pathogen. An integrated map was constructed for linkage group three based on microsatellite markers. For QTL mapping two methodologies based on alleles identical-by-descent (IBD) were used: single marker analysis of Haseman and Elston and the interval mapping procedure of Fulker and Cardon. Both methods showed significant association for the Embra 125 marker.The QTL that explained 42 % of the phenotypic variation was mapped to 0.02 cM of this marker by the Fulker and Cardon. Marker Embra 125 has potential use in assisted selection, thus increasing the efficiency of the selection of resistant genotypes.
Highlights
Eucalyptus is one of the most important genera for the cellulose and paper industries, besides its good adaptability and standing at the beginning of its domestication
Considering all the above, the purpose of this study was to test whether the resistance to rust in an interspecific family of Eucalyptus is controlled by the same genomic region that controls resistance to rust in E. grandis through a mapping strategy that has greater statistical power for identifying QTLs in exogamous populations
The distance estimated in cM of Kosambi between the marker loci is shown on Figureo1
Summary
Eucalyptus is one of the most important genera for the cellulose and paper industries, besides its good adaptability and standing at the beginning of its domestication. These aspects awaken the interest for a better yield, product quality, and disease and stress resistant perspective (Picoli et al 2004). A gene, named Ppr-1, was mapped with RAPD markers in a family of full siblings of Eucalyptus grandis. Because of the limitations inherent to the RAPD technique, use of the linkage information about Ppr-1 was restricted to the pedigree used in its mapping which limits the effective use of the AT9/917 marker in assisted selection
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