Genetic diversity differences between parental and progeny population of populus euphratica populations in a fragmented river ecosystem

Download
2021-2-15
Çelik, Mert
Euphrates poplar, also known as desert poplar in the literature, grows along riverbanks in arid and semi-arid regions and is well-known for its high tolerance to broad temperature changes, drought, and soils with high salt content. The presence of healthy Euphrates poplar forests in riparian ecosystems is of high importance due to their direct effect on local biodiversity as being pioneer species within their habitats. In addition to its positive impact on biodiversity, the species’ healthy and unfragmented populations provide valuable ecosystem services such as watershed protection, riverbank stabilization, erosion prevention, and windbreak formation. However, current populations show a decreasing trend across the globe due to various anthropogenic factors, including the transformation of rivers’ hydrological characteristics due to improper water management, groundwater pollution, and excessive logging. Therefore, determining the species’ genetic potential with an agebased perspective can create the backbone of future conservation measures by revealing information regarding the extent of genetic diversity transfer between mature and young stands, as well as the generative regeneration capacity of natural populations. In this study, the genetic diversity of mature and young stands found along three distinct locations (upstream, midstream, and downstream) of the Göksu River were compared via genotypic data created by 15 microsatellite markers. Low to moderate allelic diversity and heterozygosity values were obtained in all age structures, pointing out the gene pool shrinkage associated with sudden reductions in population size. Nevertheless, low clonality and highly similar genetic diversity values of mature and young stands revealed the relative success of genetic diversity transfer in all populations. The genetic structure of age groups also exhibited the lack of agebased genetic differentiation due to high-degree gene flow between the mature and young stands found in the same locality. As being the most distant population in terms of genetic structure, the downstream location (GDOWN) has the highest genetic diversity values together with the highest number of private alleles found in its young population. Therefore, in order to avoid further loss of genetic diversity, the downstream population can be subject to both in-situ and ex-situ conservation measures.

Suggestions

Genetic diversity pattern in female and male trees of populus euphratica populations sampled from Göksu river basin
Nebioğlu, Nehir; Kaya, Zeki; Department of Biology (2021-1-3)
Populus euphratica, one of the four Populusspecies naturally distributed in Southern and Southeastern Turkey, can survive under extreme conditions like high temperatures, low moisture, salty and calciferous soils. P. euphratica carries great significance for both the sustainability of a healthy river ecosystem and the supply of renewable energy resources. Meanwhile, due to the continuous increase in the human population, water resources decrease, and habitat destruction becomes unavoidable for this species....
Genetic differentiation between clone collections and natural populations of European black poplar (Populus nigra L.) in turkey
Çiftçi, Asiye; Kucukosmanoglu, Filiz; Karahan, Alptekin; Kaya, Zeki (2017-06-01)
The European black poplar (Populus nigra L.) is an ecologically and economically important tree species for Turkey. The important and major genetic resources of species for future breeding and ex situ conservation purposes have been archived in a clone bank in Ankara by selecting clones from natural populations and old plantations throughout Turkey. There is no study to date assessing genetic composition these materials. Two-hundred-thirty-three P. nigra clones from six geographic region of Turkey (clone co...
Genetic diversity structure of populus nigra populations in a major rivers system. what is the role of human impact?
Çiftci, Asiye; Kaya, Zeki (2017-09-22)
Populus nigra is one of the most economically and ecologically important forest trees in Turkey, well known for its rapid growth, good ability to vegetative propagation and the extreme uses of its wood. Due to overexploitation, loss of natural distribution area and extreme hybridization and introgression, Populus nigra is one of the most threatened tree species in Turkey and Europe. Using seventeen nuclear SSR loci, the genetic structure of European black poplar populations along the largest river of Turkey...
Genetic variation in Turkish red pine (Pinus brutia Ten.) seed stands as determined by RAPD markers
Kandedmir, GE; Kandemir, I; Kaya, Zeki (2004-01-01)
Turkish red pine (Pinus brutia Ten.) is one of the important tree species in Turkey. The species has been heavily disturbed by anthropogenic factors and fire, making it important to understand the magnitude of the impact on genetic diversity of areas reserved for seed production. To explore the extent of genetic variation in Turkish red pine seed stands, a random amplified polymorphic DNA (RAPD) marker system was used in the study. The estimated genic diversity for seed stands was found to range from H=0.17...
Genetic variation in wood specific gravity of half-sib families of Pinus nigra subsp pallasiana tested at the juvenile stage: Implications for early selection
Kaya, Zeki; Temerit, A; Vurdu, H (2003-01-01)
Seeds from 7 populations (total of 281 half-sib families, progeny test) and 35 seed stands (provenance test) representing natural range of Anatolian black pine (Pinus nigra subsp. pallasiana) were sown in a forest nursery in Ankara in 1990 and raised until age 3. Stem wood specific gravity (WSG) of all seedlings was determined at age of 3. The results of this study indicated that WSG did not vary significantly neither among the 7 populations (ranging from 0.41 to 0.42) nor among 35 seed stands (ranging from...
Citation Formats
M. Çelik, “Genetic diversity differences between parental and progeny population of populus euphratica populations in a fragmented river ecosystem,” M.S. - Master of Science, Middle East Technical University, 2021.