Genetic variation and structure among Swiss stone pine (Pinus cembra) and Scots pine (Pinus sylvestris) populations in the western Italian Alps

Belletti, P.; Gullace, S.

Sherwood Foreste ed Alberi Oggi 5(4): 11-16

1999


Accession: 003152119

Download citation:  
Text
  |  
BibTeX
  |  
RIS

Article/Abstract emailed within 1 workday
Payments are secure & encrypted
Powered by Stripe
Powered by PayPal

Abstract
The genetic diversity and the genetic differentiation among five populations of Swiss stone pine (Pinus cembra) and five of Scots pine (Pinus sylvestris) located in alpine areas of Piedmont and the Valle d'Aosta in NW Italy were studied by means of isoenzyme variation at fifteen loci. The two species showed similar values for the mean number of alleles per locus and percentage of polymorphic loci, while the expected heterozygosity for Scots pine was higher than that for Swiss stone pine (0.332 vs 0.281). All the populations studied showed an excess of homozygotes: the Allevet population of P. cembra had the highest value of fixation index (0.266). Furthermore, the latter stand exhibited the lowest allelic richness index value. Only 2.7% and 3.5%, respectively, of P. cembra and P. sylvestris observed genetic diversity was due to differentiation among populations: therefore, the populations studied share the same gene pools and there are no barriers hampering the gene flow. The results of the study provide useful information for in situ conservation of genetic variability. Moreover, the data obtained can be also used for the identification of the most valuable stands for the production of high quality seeds.