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Chromosome numbers and genome size data on species of the genus Petrorhagia (Caryophyllaceae) from Turkey / Kamuran Aktas in Turkish Journal of Botany, vol. 46 (Année 2022)

Public [article]  inTurkish Journal of Botany > vol. 46 (Année 2022) . - pp. 134-141 Titre : Chromosome numbers and genome size data on species of the genus Petrorhagia (Caryophyllaceae) from Turkey Auteurs : Kamuran Aktas, Auteur ; Jaume Pellicer, Auteur ; Teresa Garnatje, Auteur Année de publication : 2022 Article en page(s) : pp. 134-141 Langues : Anglais (eng) Catégories : [Espèces (in biblio)] Caryophyllaceae [Espèces (in biblio)] Petrorhagia Mots-clés : nombre de chromosome  flore endémique, cytométrie en flux  génome Résumé : "Genome size, i.e. the total amount of DNA in an unreplicated somatic nucleus is considered an important character in the biology of organisms, and it is especially relevant for land plants given the extraordinary diversity reported. Despite the continuous growth of data and the efforts aimed at increasing our understanding of plant genome size diversity, more data are needed to have an evenly representation across lineages. With this premise in mind, in this work, we investigated genome size, complemented with chromosome data in eight species of the genus Petrorhagia (Caryophyllaceae) from Turkey. Chromosome counts made indicate that the species studied are diploid except for one species, P. saxifraga, which is probably a tetraploid, based on previously published estimations of nuclear DNA contents. The presence of both basic chromosome numbers x = 15 and x = 13 is confirmed, the latter being restricted to the species P. hispidula and P. cretica. The counts carried out for the Turkish endemic species, in P. hispidula (2n = 26), P. pamphylica (2n = 30) and P. peroninii (2n = 30) represent novel data for the genus. Nuclear DNA contents ranged from 1.24 to 2.32 pg/2C (varying 1.87-fold). Based on available data, genome expansions in the genus seem to have occurred through different evolutionary mechanisms, such as polyploidy and differential repetitive DNA activation, evidencing contrasting genomic trajectories between closely related taxa." (source : auteurs) Type de publication : périodique Référence biblio : Aktas K., Pellicer J., Garnatje T., 2022 - Chromosome numbers and genome size data on species of the genus Petrorhagia (Caryophyllaceae) from Turkey. Turkish Journal of Botany, 46 : 134-141. ID PMB : 72169 Permalink : http://www.cbnbrest.fr/catalogue_en_ligne/index.php?lvl=notice_display&id=72169 [article]

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Ophrys fusca and Ophrys dyris (Orchidaceae) – constancy of tetraploidy amongst populations in Central Portugal / Joana Abreu in New Journal of botany, vol. 7, n°2-3 (Année 2017)

Public [article]  inNew Journal of botany > vol. 7, n°2-3 (Année 2017) . - pp. 94-100 Titre : Ophrys fusca and Ophrys dyris (Orchidaceae) – constancy of tetraploidy amongst populations in Central Portugal Type de document : texte imprimé Auteurs : Joana Abreu, Auteur ; Julie A. Hawkins, Auteur ; Helena Cotrim, Auteur ; Michael F. Fay, Auteur ; Oriane Hidalgo, Auteur ; Jaume Pellicer, Auteur Année de publication : 2018 Article en page(s) : pp. 94-100 Langues : Anglais (eng) Mots-clés : flow cytometry   chromosome numbers   cytotype   genome size   polyploidy Résumé : "Ophrys is amongst the best known orchid genera and is an established system for the study of pollinator-mediated floral evolution. Two species, Ophrys fusca s.l. and Ophrys dyris (= O. omegaifera subsp. dyris) belonging to Ophrys section Pseudophrys are the focus of this study. In the context of an integrative study of morphological and genetic diversity of O. fusca and O. dyris, genome size (GS) and cytotype diversity were surveyed from Portuguese populations. Flow cytometry methods were used to assess GS, and subsequently determine the ploidy level of 67 specimens, including the species and putative hybrids. Cytotypes were also confirmed based on chromosome counts from the roots of two specimens, one of each species. Constancy of nuclear DNA content (1C = 11.19 pg) and ploidy level (2n = 4x = 72, 74) was documented among all the individuals analysed. Implications are considered, in terms of interpreting the origin and predicting the persistence of putative hybrids." Type de publication : périodique Référence biblio : Abreu J., Hawkins J., Cotrim H., Fay M., Hidalgo O., Pellicer J., 2018 - Ophrys fusca and Ophrys dyris (Orchidaceae) – constancy of tetraploidy amongst populations in Central Portugal. New Journal of botany, 7 : 94-100. DOI : 10.1080/20423489.2017.1408185 Permalink : http://www.cbnbrest.fr/catalogue_en_ligne/index.php?lvl=notice_display&id=66864 [article]

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