PJB-2023-367
SYSTEMATIC STATUS AND PHYLOGENETIC RELATIONSHIPS OF SOME EUPHORBIA L. TAXA FROM TURKEY BASED ON nrDNA INTERNAL TRANSCRIBED SPACER (ITS) SEQUENCES
Alpaslan KOÇAK
Abstract
Euphorbia L. genus is represented in Turkey by 120 taxa which are distributed throughout the country and 18 of these taxa are endemic to Turkey. Phylogenetic relationships were determined by nrDNA Internal Transcribed Spacer (ITS) sequence analysis of 27 taxa belonging to this genus. Among the examined taxa, E. grisophylla, E. rhytidosperma ve E. sanasunitensis are endemic species. The phylogenetic relationships of the examined taxa in subgen. Chamaesyce, subgen. Cystidospermum and subgen. Esula of the Euphorbia genus were shown in dendrogram. According to the molecular phylogenetic relationship data obtained as a result of the study, it was revealed that the subgenera distinction of the Euphorbia genus was made correctly, but the sections and groups distinction was not supported completely. It was revealed in the Maximum Likelihood tree based upon the Tamura-Nei model of nrDNA ITS tree that E. petiolata and E. chamaesyce species belonging to subgen. Cystidospermum and subgen. Chamaesyce respectively, differed sharply from taxa belonging to subgen. Esula. Within the subgen. Esula, the sect. Helioscopia showed the most distant relationship to the sect. Esula. According to the results we obtained, it was revealed that E. heteradena species should be evaluated in a different Group, not in Group A. The systematic status of E. gailladotii, E. aleppica, E. szovitsii var. kharputensis and E. falcata subsp. falcata needs to be reassessed. It was also supported by molecular data that E. sanasunitensis is in subgen. Esula for the first time at the molecular level.
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