Anu Mattila, Anne Pakkanen, Juha Raisio, Pekka Vakkari. (1994). Genetic variation in English oak (Quercus robur) in Finland. Silva Fennica vol. 28 no. 4 article id 5537. https://doi.org/10.14214/sf.a9177

Keywords: Quercus robur; allozymes; populations; genetic differences; heterozygosity

Abstract | View details | Full text in PDF | Author Info

Genetic variation in 5 natural stands of Quercus robur L. in Finland was analysed electrophoretically for 13 isozyme loci. Stands were on average polymorphic at 49.2% of the loci, with 2.1 alleles per locus. Observed heterozygosities, ranging from 13.6% to 16.9%, were slightly lower than estimates reported for German stands. The majority of the species’ genetic variation was found within each studied stand, and only 5.5% was between stands. Mean genetic differentiation (∂) was the same as that found in the primary range of the species, but the differentiation estimates (D) for single Finnish population were more variable.

Mattila, E-mail: am@mm.unknown
Pakkanen, E-mail: ap@mm.unknown
Raisio, E-mail: jr@mm.unknown
Vakkari, E-mail: pv@mm.unknown

Category : Research article

article id 1274, category Research article

Juho Hautsalo, Paul Mathieu, Sakina Elshibli, Pekka Vakkari, Juha Raisio, Pertti Pulkkinen. (2015). Variation in height and survival among northern populations of pedunculate oak (Quercus robur L.): results of a 13-year field study. Silva Fennica vol. 49 no. 2 article id 1274. https://doi.org/10.14214/sf.1274

Keywords: adaptation; growth; pedunculate oak; northern stands

Highlights: A height-sum function allowed us to compare the combined growth and survival of northernmost stands of pedunculate oak; Individuals from Turku-Katariinanlaakso performed the best, although other families performed more consistently across trials, which should be considered in future conservation and breeding. Surprisingly, trees planted in a trial location beyond the natural northern limit of pedunculate oak showed the best performance.

Abstract | Full text in HTML | Full text in PDF | Author Info

We analysed the adaptive potential of pedunculate oak (Quercus robur L.) in terms of variation in height and survival in five field trials located in southern and central Finland. The trials were established with Finnish native material from six different seed origins. Thirteen years after planting, the number of living trees was counted and measured for height. Analysis of height and survival revealed a significant effect of origin, i.e., a genetic basis to individual tree performance. Two origins from the Turku region (Ruissalo and Katariinanlaakso) performed the best while trees originating from Parainen (Lenholmen) performed the worst. In order to study the effects due to tree origin, a comparison of families (half-sibling trees, i.e. those sharing the same ‘mother’ tree) was made by combining height and survival through a height-sum equation (i.e., the product of mean survival and height of each family in each trial) and used to calculate family- and origin-level ecovalences. Ecovalence is a metric for performance consistency, and indicates how much each variable contributes to the total variation; the higher the value, the lower the consistency of trees across the trials based on their origin or family. Analysis of consistency showed similar results to growth and survival, with Turku families performing the best and families from Parainen performing the worst. Families in the Katariinanlaakso stand (Turku) generally had more stable ecovalence values and more dispersed height-sums, while Ruissalo (Turku) families had higher mean height-sum but higher variability in ecovalence values. These results suggest that seed origins (i.e., genotypes) can be optimized in terms of their suitability for commercial or ecological forest management.

Hautsalo, Natural Resources Institute Finland (Luke), Green technology, Antinniementie 1, FI-41330 Vihtavuori, Finland E-mail: juho.hautsalo@luke.fi
Mathieu, Agrocampus Ouest, 35000 Rennes, France E-mail: pm@nn.fr
Elshibli, University of Helsinki, Helsinki, Finland E-mail: se@nn.fi
Vakkari, Natural Resources Institute Finland (Luke), Vantaa, Finland E-mail: pekka.vakkari@luke.fi
Raisio, City of Helsinki, Helsinki, Finland E-mail: jr@nn.fi
Pulkkinen, Natural Resources Institute Finland (Luke), Vantaa, Finland E-mail: pertti.pulkkinen@luke.fi

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