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Keywords = Himantoglossum samariense

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22 pages, 4531 KiB  
Article
Genetic Variation and Differentiation of Himantoglossum s.s. in Greece
by Spyros Tsiftsis, Martha Charitonidou, Panagiotis Madesis and Andreas D. Drouzas
Diversity 2025, 17(5), 329; https://doi.org/10.3390/d17050329 - 3 May 2025
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Abstract
The taxonomic identification of plant species is traditionally based on morphological traits, the use of which may create difficulties in cases of close-related species showing great morphological variability. In such cases, the use of DNA markers for species identification and delimitation can be [...] Read more.
The taxonomic identification of plant species is traditionally based on morphological traits, the use of which may create difficulties in cases of close-related species showing great morphological variability. In such cases, the use of DNA markers for species identification and delimitation can be of great help. Himantoglossum W.D.J.Koch (Orchidaceae) is a genus with notable morphological variability, comprising the clade hircinum-caprinum (Himantoglossum s.s.) with nine taxa, from which H. jankae, H. hircinum, H. montis-tauri, H. caprinum and H. samariense have being reported in Greece. However, a previous morphological study of Himantoglossum s.s. from all over Greece could not verify the presence of these reported species, but of only one highly diverse taxon throughout the country. Here, we studied the genetic variation and differentiation of Himantoglossum s.s. populations from the entire distribution of the genus in Greece employing ISSR markers, to further elucidate the taxonomic status of Himantoglossum s.s. in Greece. High genetic variation was revealed, both in the populations of the “core” distribution and in the peripheral/marginal ones, pointing to their evolutionary potential. This variation is mainly attributed to differences within the populations and, to a lesser extent, among them. No differentiation of the populations proposed to belong to a different taxon was found and no species-specific markers were identified that may discriminate the above populations from the rest. In addition, two cpDNA and one nDNA fragments (accD, psbA-trnH and ITS2, respectively) were sequenced in a number of individuals representative of the whole dataset. All three fragments were conserved, showing restricted polymorphism and having no correlation to the populations or to the taxa of Himantoglossum s.s. in Greece. Overall, the high genetic variation of the populations of Himantoglossum s.s. in Greece, especially of the peripheral/marginal ones, is a valuable asset towards their conservation. Full article
(This article belongs to the Section Plant Diversity)
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