IDENTIFICATION OF A RAPD MARKER FOR PALMITIC-ACID CONCENTRATION IN THE SEED OIL OF SPRING TURNIP RAPE (BRASSICA-RAPA SSP OLEIFERA)

F-2 progeny (105 individuals) from the cross Jo4002 x Sv3402 were used to identify DNA markers associated with palmitic-acid content in spring turnip rape (Brassica rapa ssp. oleifera). QTL mapping and ANOVA analysis of 140 markers exposed one linkage group with a locus controlling palmitic-acid content (LOD score 27), and one RAPD (random amplified polymorphic DNA) marker, OPB-11a, closely linked (1.4 cM) to this locus. Palmitic-acid content in the 62 F-2 plants with the visible allele of marker OPB-11a was 8.45 +/- 3.15%, while that in the 24 plants without it was 4.59 +/- 0.97%. As oleic-acid concentration is affected by a locus on the same linkage group as the palmitic-acid locus, this locus probably controls the chain elongation from palmitic acid to oleic acid (through stearic acid). Marker OPB-11a may be used in future breeding programs of spring turnip rape to simplify and hasten the selection for palmitic-acid content.