Abstract
A high degree of endemism has been recorded for several plant groups collectively in Saint Katherine Protectorate (SKP) in the Sinai Peninsula. Nine endangered endemic plant species in SKP were selected to test the variable abilities of three different DNA barcodes; Riboluse-1,5- Biphosphate Carboxylase/Oxygenase Large subunit (rbcL), Internal Transcribed Spacer (ITS), and the two regions of the plastid gene (ycf1) as well as Start Codon Targeted (SCoT) Polymorphism to find the phylogenetic relationships among them. The three barcodes were generally more capable of finding the genetic relationships among the plant species under study, new barcodes were introduced to the National Centre for Biotechnology Information (NCBI) for the first time through our work. The barcode sequences were efficient in finding the genetic relationships between the nine species. However, SCoT polymorphism could only cluster plant species belonging to the same genus together in one group, but it could not cluster plant species belonging to the same families except for some primers solely. RbcL was the most easily amplified and identified barcode in eight out of the nine species at the species level and the ninth barcode to the genus level. ITS identified all the species to the genus level. Finally, ycf1 identified six out of the eight species, but it could not identify two of the eight species to the genus level.
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