Mapping quantitative trait loci controlling early growth in a (longleaf pine × slash pine) × slash pine BC₁ family

Abstract

Random amplified polymorphic DNA (RAPD) markers were employed to map the genome and quantitative trait loci controlling the early growth of a pine hybrid F₁ tree (Pinus palustris Mill. × P. elliottii Engl.) and a recurrent slash pine tree (P. ellottii Engl.) in a (longleaf pine × slash pine) × slash pine BC₁ family consisting of 258 progeny. Of the 150 hybrid F₁ parent-specific RAPD markers, 133 were mapped into 17 linkage groups covering a genetic distance of 1,338.2 cM. Of the 116 slash pine parent-specific RAPD markers, 83 were mapped into 19 linkage groups covering a genetic distance of 994.6 cM. A total of 11 different marker intervals were found to be significantly associated with 13 of the 20 traits on height and diameter growth using MAPMAKER/QTL. Nine of the eleven marker intervals were unique to the hybrid parent 488 genome, and two were unique to the recurrent parent 18-27 genome. The amount of phenotypic variance explained by the putative QTLs ranged from 3.6% to 11.0%. Different QTLs were detected at different ages. Two marker intervals from the hybrid parent 488 were found to have QTL by environment interactions.

Citation

Weng, C.; Kubisiak, Thomas L.; Nelson, C. Dana.; Stine, M. 2002. Mapping quantitative trait loci controlling early growth in a (longleaf pine × slash pine) × slash pine BC₁ family. Theor Appl Genet (2002) 104:852-859