C. Damgaard et V. Loeschcke, INBREEDING DEPRESSION AND DOMINANCE SUPPRESSION COMPETITION AFTER INBREEDING IN RAPESEED (BRASSICA-NAPUS), Theoretical and Applied Genetics, 88(3-4), 1994, pp. 321-323
Rapeseed plants, of the summer annual variety Topas, that had been sel
fed twice consecutively were compared to outcrossed half-sibs for inbr
eeding depression in a rapeseed population at mating equilibrium. The
effect of dominance-suppression competition was included in the effect
of inbreeding. Both female- and male-fitness characters showed signif
icant inbreeding depression. Biomass decreased 17% with inbreeding and
was highly correlated with seed weight. The total number of flowers d
ecreased 15% with inbreeding. There was a significant effect of lines.
The possible importance of experimental design in studies that estima
te inbreeding depression is discussed.