Mating System and Effective Pollen Immigration in a Norway Spruce (Picea abies (L.) Karst) Plantation

1994

S. 48-52

37 Lit. Ang.

Unselbständiges Werk

200051517

Mating system and effective pollen immigration in a Norway spruce (Picea abies (L.) Karst) plantation were studied using multilocus allozyme markers. The estimated proportions of ovules fertilized by pollen from maternal trees themselves (selfing), from other trees within the plantation (local outcrossing), and from trees outside the plantation (immigration) were 0.09, 0.75, and 0.16, respectively. These estimates varied significantly among trees within the plantation. The majority of selfs (85%) and pollen immigrants (84%) could be attributed to a small proportion ot trees (25%). Fifty percent of pollen haplotypes observed in the plantation were due to immigration and most of them likely were contributed by an extraneous population located about 4km away. These results advance our knowledge about gene flow in conifers and have implications for seed orchard management.