Ophrys fusca and Ophrys dyris (Orchidaceae)–constancy of tetraploidy amongst populations in Central Portugal

J. A. Abreu, J. A. Hawkins, H. Cotrim, M. F. Fay, O. Hidalgo, J. Pellicer

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    Abstract

    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.

    Original languageEnglish
    Pages (from-to)94-100
    Number of pages7
    JournalNew Journal of Botany
    Volume7
    Issue number2-3
    DOIs
    Publication statusPublished - 2 Sep 2017

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