Abstract :
This study provides a new insight into Turkish Salix L. systematics, using a molecular phylogeny and numerical morphometric analysis approach. Despite its economic importance for bioenergy, there is to date no record of any extensive study on this Turkish willow species. Twenty-four Salix species and one hybrid were subjected to molecular and morphometric evaluation, in which one gene region of the external transcribed spacer (ETS) of the 18S-26S nuclear ribosomal DNA and 11 morphological characters were analyzed using a Bayesian Analysis of Beast program and Multiple Correspondence Analysis (MCA) in R. The results indicate that Salix species in Turkey could be accurately classified at the subgenera level, considering the selected gene region and morphological traits (subgenus Salix and Vetrix). Life form, leaf shape (Dim 1) and bud scale (Dim 3) were highly discriminative at the subgenera level. The molecular and morphological data confirmed that the taxonomic position of Salix amplexicaulis needs to be changed as subgenus Salix. Additionally, the members of subgenus Salix, S. acmophylla and S. pentandroides were all clustered distantly from other species of the subgenus. Keywords: Turkish willows, phylogeny, nrDNA, external transcribed spacer, numerical taxonomy Bu alisma, Trk Salix L. sistematigine molekler filogenetik ve sayisal morfometrik analiz yaklasimi kullanarak yeni bir bakis aisi sunmaktadir. Biyoenerjide ekonomik aidan önemli olmasina ragmen, Trkiye Sögt trlerinde bu gne kadar kapsamli bir alisma bulunmamaktadir. alismada 18S-26S ekirdek ribosomal DNA 'Eksternal transcribed spacer' (ETS gen bölgesi ve on bir bilgilendirci morfolojik karakter seilerek, sirasiyla Beast programi, Bayesian ve R paketi, Multiple Correspondence Analizleri (MCA) ile yirmi dört Salix tr ve bir melezde degerlendirme yapilmistir. Sonular isiginda Trkiye'deki Salix trleri, seilen gen bölgesi ve morfolojik özelliklere göre altcins seviyesinde dzgn bir sekilde ayrilmaktadir (Altcins Salix ve Vetrix). Hayat formu, yaprak sekli (Dim1) ve tomurcuk pulu (Dim3) altcins dzeyinde olduka ayirt edici karakterlerdir. Molekler ve morfolojik veriye göre Salix amplexicaulis trnn taksonomik pozisyonu altcins Salix olarak degistirilmelidir. Ayrica, altcins Salix yelerinden S. acmophylla ve S.pentandroides altcinsin diger trlerinden her zaman uzakta konumlanmaktadir. Anahtar Kelimeler: Trkiye sögtleri, filogeni, nrDNA, external transcribed spacer, numerik taksonomi
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