Mapping QTLs Controlling Yield and Yield Components of Oilseed Rape under Normal Irrigation and Drought Stress Conditions

In order to map QTLs of yield and its components in oilseed rape under normal and drought stress conditions, 135 doubled haploid lines derived from the cross between a Korean spring line "Yudal" and a French winter line "Darmor" were evaluated. Genetic map of 19 linkage groups of oilseed rape using doubled haploid population was constructed by 459 molecular markers including isozyme, RFLP, RAPD, SSR and SNP. Using the composite interval mapping method, a total of of 38QTLs detected for measured traits under normal and drought stress conditions. Most QTLs were located on DY13 and DY6. It’s thought that these two linkage groups have a basic function in the genetic control of some agronomic traits. One of the important QTLs was detected on chromosome DY6 linked to the dwarf gene Bzh. This QTL had pleiotropic effects on most traits. As this QTL had a major effect, it could be used in marker assisted selection. The major QTLs for yield and its components were the same under both normal and stress conditions.