Abstract
Background
In Tunisia, Kermes oak (Quercus coccifera L.) populations are severely destroyed due to deforestation. Nowadays, no preservation programs are attempted, yet, to conserve and promote the potential value of this resource. In this work, we assessed the genetic diversity of seven natural Tunisian populations of Q. coccifera from different bioclimates using Inter-Simple Sequence Repeats molecular markers. The distribution of the genetic diversity of Q. coccifera constitutes the pioneer step in the process of the conservation of the species.
Methods and Results
Nine selected ISSR markers were analyzed to characterize the genetic profiles of 70 different genotypes. The ISSR primers produced 64 loci ranging from 6 (UBC809 and UBC810) to 9 (UBC873) with an average of 7.11 at the species level. The average percentage of the polymorphic loci varied from 64.06% (Tabarka) to 76.56% (El Haouaria). The analyzed genotypes (70 individuals) revealed a high level of genetic diversity at species level (Na = 1.697; Ne = 1.517; He = 0.289; I = 0.418). The major proportion of the variation was attributable to individual differences within populations (76.07%). Analysis of molecular variance revealed also significant differentiation among all populations (ΦST = 0.245) and among populations within bioclimates (ΦSC = 0.233), even at a low scale space. The UPGMA and the PCoA analyses showed that most populations clustered independently to bioclimate or geographical distance indicating that genetic differentiation mainly occurs at local space scale due to genetic drift.
Conclusions
The in-situ conservation of the species should be maintained on natural populations as a forest genetic resources. Moreover, ex-situ conservation should involve the selection of genotypes with extensive collection of seeds and cuttings from different populations of the target area.
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Change history
02 July 2022
A Correction to this paper has been published: https://doi.org/10.1007/s11033-022-07589-6
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Acknowledgements
This research was supported by a grant of the Ministry of Scientific Research and Technology and the National Institute of Applied Science and Technology (Research grant UR 17ES22). We wish to express our thanks to the Laboratory of Plant Biotechnology, National Gene Bank of Tunisia (NGBT).
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Flihi, J., Rhimi, A., Yangui, I. et al. Genetic diversity and population structure of Tunisian wild Kermes oak (Quercus coccifera L.): Assessment by ISSR molecular markers and implication for conservation. Mol Biol Rep 49, 6215–6224 (2022). https://doi.org/10.1007/s11033-022-07417-x
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DOI: https://doi.org/10.1007/s11033-022-07417-x