Genetic diversity and differentiation of pedunculate ( Quercus robur ) and sessile ( Q. petraea ) oaks
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ORIGINAL PAPER
Genetic diversity and differentiation of pedunculate (Quercus robur) and sessile (Q. petraea) oaks Girmantė Jurkšienė1 · Oleg Yu. Baranov2 · Dmitry I. Kagan2 · Olja A. Kovalevič‑Razumova2 · Virgilijus Baliuckas1,3
Received: 23 April 2019 / Accepted: 6 June 2019 © The Author(s) 2019
Abstract This study was conducted to determine the parent–offspring genetic structure of the pedunculate oak (Quercus robur L.), sessile oak (Q. petraea [Matt.] Liebl.) and their hybrids. Forty half-sib Quercus families and their maternal trees originating from one tree stand in southern Lithuania were analyzed using SSR and RAPD markers. Based on a preliminary study of leaf morphological traits, the individuals separated into six groups. The studied halfsib oak families were also compared for allelic diversity, including group variations; genotypic structure; genetic diversity; and the degree of genetic subdivision and differentiation. The level of genetic variation and subdivision was lower in the hybrid families than in the families of the parental species. Genotypic analysis of the half-sibling offspring
Project funding: The work was partly supported by the long-term research programme Sustainable Forestry and Global Changes implemented by the Lithuanian Research Centre for Agriculture and Forestry. The online version is available at http://www.springerlink.com Corresponding editor: Tao Xu. * Girmantė Jurkšienė [email protected] 1
Forest Genetics and Tree Breeding Department, Institute of Forestry, Lithuanian Research Centre for Agriculture and Forestry, Liepų str. 1 Girionys, 53101 Kaunas District, Lithuania
2
Forest Research Institute of the National Academy of Sciences of Belarus, Proletarskaja str. 71, 246050 Gomel, Republic of Belarus
3
Institute of Forest Biology and Silviculture, Vytautas Magnus University Agriculture Academy, Studentų str. 11, 53361 Akademija, Kaunas District, Lithuania
showed the asymmetric nature of interspecific hybridization processes of pedunculate and sessile oaks in mixed stands. Keywords Half-sib families · Interspecific oak hybrids · Microsatellites · Offspring · Simple sequence repeats (SSRs) · Randomly amplified polymorphic DNA (RAPD)
Introduction One approach to solving the considerable challenge of conserving biodiversity, in and the genetic resources of forest tree species in particular is through the study to the genetic structure and polymorphism in oak populations and their peculiarities, which are governed largely by origin. In the current study, we analyzed the progeny of sessile oak [Quercus petraea (Matt) Liebl.], pedunculate oak (Q. robur L.), and their hybrids in the Trakas forest (Lithuania). Sessile oak overlaps with pedunculate oak in regions within the Atlantic and continental climate zones. Because the two oak species grow under different climatic conditions, the populations formed under these conditions are characterized by high intraspecific genetic variation and differ in terms of phenology, growth rate, shape, and other characteris
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