Líffræðifélag Íslands - biologia.is
Líffræðiráðstefnan 2023
Höfundar / Authors: Ingvild Ryde (1,2), Elizabeth HJ Neilson (2), Eliza Cwalina(2), Delphine Pottier (2), Augustin Baussay (2), Marika Halmová (1), Jóhanna F Kristinsdóttir (1), Kari Anne Bråthen (3), Ingibjörg S Jónsdóttir (1)
Starfsvettvangur / Affiliations: 1) University of Iceland, Institute of Life and Environmental Sciences, Reykjavik, ICELAND; 2) University of Copenhagen, Section for Plant Biochemistry, Department of Plant and Environmental Sciences, Copenhagen, Denmark; 3) The Arctic University of Norway, Department of Arctic and Marine Biology, Tromsø, Norway
Kynnir / Presenter: Ingvild Ryde
Empetrum nigrum populations from mainland Scandinavia release allelopathic specialized metabolites that inhibit seed germination and growth of neighboring plants. Such allelopathic capacity is primarily assigned to two bibenzyl compounds: batatasin-III (BIII) and 3,4-dimethoxy-2´,5-dihydroxybibenzyl (DDB). In contrast to mainland Scandinavia, the allelopathic capacities of E. nigrum from Icelandic ecosystems is not well known and the bioactive constituents may differ from other populations due to their geographical isolation and unique physiochemical volcanic soil properties. Therefore, whether the allelopathic effects of Icelandic E. nigrum populations contribute to the severe retardation of ecosystem recovery in degraded rangelands is uncertain. To assess the allelopathic role of Icelandic E. nigrum, a combination of chemical analysis by liquid chromatography-mass spectrometry (LC-MS) and bioassays were performed on different Empetrum populations, subspecies, and sexes. Preliminary results show that BIII and DBB are both produced by Icelandic E. nigrum populations and that foliar tissue from these populations inhibit germination and root elongation of the grass species Festuca richardsonii. Furthermore, results also suggest that the subsp. hermaphroditum is more allelopathic than the subsp. nigrum. Further studies will now compare the allelopathic capacities of E. nigrum in soils from Iceland and mainland Scandinavia.