Genetic structure of Tunisian natural carob tree (Ceratonia siliqua L.) populations inferred from RAPD markers |
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| Authors: | Makrem Afif Chokri Messaoud Abdennacer Boulila Hnia Chograni Afef Bejaoui Mohamed Nejib Rejeb Mohamed Boussaid |
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| Institution: | 1. Department of Biology Laboratory of Plant Biotechnology Centre Urbain Nord, National Institute of Applied Sciences and Technology (INSAT), BP 676, 1080, Tunis Cedex, Tunisia
2. National Institute of Research in Agricultural Engineering, Water and Forests, BP 10, 2080, Ariana, Tunisia
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| Abstract: | ? Seven RAPD markers were used to assess the genetic diversity and structure of ten Tunisian natural Ceratonia siliqua L. populations from different geographic and bioclimatic zones. ? The species maintain a high diversity within population as estimated by the percentage of polymorphic loci and Shannon’s index (P% = 76.31, $\bar H'_{pop} = 0.569$ ). The range of variation between populations was large. Populations from the upper semi-arid bioclimates, with more continuous distribution area showed the highest level of variation. ? A high genetic differentiation among populations (ΦST = 0.250 and $\bar G_{ST} = 0.347$ ), as a result of population isolation was revealed. Nevertheless, the genetic structure is in accordance with bioclimate indicating that ecological factors also should influence differentiation. Populations from the sub-humid, upper semi-arid and mean semi-arid zones clustered together and were distinct from those of the lower semi-arid ones. ? Conservation strategy should be made according to the level of polymorphism within population and bioclimate. |
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