Procjena genetskih parametara u testovima polusrodnika hrasta lužnjaka (Quercus robur L.) iz sjemenskih zona Posavine, Podravine i Podunavlja | Estimation of Genetic Parameters in Open Pollinated Progeny Trials from Plus Trees of Pedunculate Oak (Quercus robur L.) Selected in Posavina and Podravina and Podunavlje Seed Zones
2011
Kajba, Davorin | Katičić, Ida | Bogdan, Saša
Pedunculate oak (Quercus robur L.) is one of themost important species in Croatia, both ecologically and economically. In the 1950’s natural oak stands in Croatia were evaluated in terms of wood productivity and quality. The results and additional ecological studies delineated three seed zones and seven seed regions (NN107/08).Over the past decades, the periodicity of seed crops has not been regular, which has limited natural regeneration and artificial planting in partial naturally regenerated stands. In order to increase genetic quality and reduce seed periodicity, it was decided to establish clonal seed orchards (Vidaković 1996). Plus trees have been selected in three seed regions, based on ten evaluated traits, and three clonal seed orchards have been established in the areas of Forest Municipality Vinkovci, Našice and Čazma. Potential for genetic gain by selected plus trees can be evaluated by progeny trials in common environmental conditions and because of long lifespan of forest trees, it is crucial to evaluate it as early as possible. Considering biological and ecological characteristics of pedunculate oak, evolutionary factors shaping the genetic structure of its populations and existing research on its genetic variability in Croatia (Perić et al. 2000, Bogdan et al. 2004, 2008, Kajba et al. 2006, Katičić et al. 2010), it can be assumed that most of its genetic variability lies on the intrapopulation, namely individual level. Such a pattern of variability points to considerable possibilities of genetic improvement by individual selection. The aim of this research is to estimate the trends of genetic parameters, heritability and genetic gains for height and diameter growth of pedunculate oak in some Croatian provenance regions.
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