DETECTION OF QUANTITATIVE TRAIT LOCI FOR JUVENILE GROWTH, FLOWER BEARING AND ROOTING ABILITY BASED ON A LINKAGE MAP OF SUGI (CRYPTOMERIA-JAPONICA DON,D)

Quantitative traits, including juvenile growth, flower bearing and roo ting ability, of a woody plant species, Cryptomeria japonica D. Don, w ere analyzed in a three-generation pedigree with 73 F-2 progenies usin g a linkage map with 85 genetic markers (72 RFLP, 11 RAPD, one isozyme and one morphological loci). A cluster of quantitative trait loci (QT Ls) related to juvenile growth and female flower bearing was detected on linkage group 2. Some of the influence of this cluster could be att ributed to pleiotropic effects of a dwarf locus located in its vicinit y. QTLs related to male and female flower bearing were detected at dif ferent locations and showed different effects from each other, suggest ing that the genetic systems controlling male and female flowering are different. No large QTL affecting rooting ability was detected in the material analyzed in this study.