| Title: | "Labellum Features and Chemical Composition of Floral Scent in Bulbophyllum carunculatum Garay, Hamer & Siegrist (Section Lepidorhiza Schltr., Bulbophyllinae Schltr., Orchidaceae Juss.)" |
| Author(s): | Wisniewska N; Golebiowski M; Kowalkowska AK; |
| Address: | "Department of Plant Cytology and Embryology, University of Gdansk, Wita Stwosza 59, 80-308 Gdansk, Poland. Laboratory of Analysis of Natural Compounds, Department of Environmental Analytics, Faculty of Chemistry, University of Gdansk, Wita Stwosza 63, 80-952 Gdansk, Poland" |
| ISSN/ISBN: | 2223-7747 (Print) 2223-7747 (Electronic) 2223-7747 (Linking) |
| Abstract: | "The vast majority of fly-pollinated Bulbophyllum species use a combination of visual and olfactory clues to mimic food sources and brood/oviposition sites of pollinators. The aims of the present work were to characterize the floral secretory tissue and the floral scent and compare them with those previously described in B. echinolabium. Based on the histochemical results, the labellar secretion in B. carunculatum is the protein-rich mucilage. The adaxial epidermal cells of the labellum showed typical features of secretory activity. Plastids contained plastoglobuli, which are thought to be the places for scent production in osmophores. Juxtaposed with FeCl(3) staining, the presence of dihydroxyphenolic globules in the cytoplasm of the epidermis and sub-epidermis was confirmed. Phenolic derivatives were also described with GC/MS analysis of the floral scent. The number of aromatic compounds and hydrocarbons was indicated in the floral scent of B. carunculatum. Moreover, pregnane-3,20-dione, occurring in the highest percentage in the floral fragrance of B. carunculatum, is a biologically active, 5-alpha-reduced metabolite of plasma progesterone. Progesterone is a mammalian gonadal hormone, but, like other steroid hormones, has been found in plants as intermediates in different biosynthetic pathways. The research on biosynthesis and functions of progesterone and its derivatives in flowers is still lacking" |
| Keywords: | Gc/ms attractants fly-pollination syndrome fragrance micromorphology pollination sapromyophily ultrastructure; |
| Notes: | "PubMed-not-MEDLINEWisniewska, Natalia Golebiowski, Marek Kowalkowska, Agnieszka K eng 531-DO30-D847-23, 531-T010-D594-23/University of Gdansk/ Switzerland 2023/04/14 Plants (Basel). 2023 Apr 6; 12(7):1568. doi: 10.3390/plants12071568" |
