Reproductive Success of Genotypes of Pinus Sylvestris L. in Different Environments

To quantify the reproductive success of individual genotypes in different environments-, the realized female and male fitness values were estimated for single clones in each of two spatially and two temporally different environments. Each of the studied clones carries a unique multilocus genotype enabling the determination of its contribution to the offspring. The results are based on 1o-locus genotyping of the parental clones and the four seed orchard offspring populations, represented by 500 seeds each.The reproductive success of the clones differ substantially from one another, regardless of whether the female, the male or both fitness components of a clone are concerned. Strong sexual asymmetries are observed which also occur in sexually opposite directions. The results do not support the assumption of genetically controlled reproductive efficiencies. However, in some cases it cannot be ruled out that this is due to environmentally dependent selection with respect to the sex function of single clones. Some consequences of the observed phenomena are outlined briefly.