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Type of publication: conference paper
Type of publication (PDB): Tezės kituose recenzuojamuose leidiniuose / Theses in other peer-reviewed publications (T1e)
Field of Science: Ekologija ir aplinkotyra / Ecology and environmental sciences (N012)
Author(s): Baležentienė, Ligita;Bartkevičius, Edmundas
Title: Phytotoxicity variation throughout the development of Heracleum sosnowskyi Manden
Is part of: Environmental Weeds and Invasive Plants : 4th International Symposium, May 19th to 23rd, 2014, Montpellier SupAgro, Montpellier, France : program-abstracts. Montpellier, 2014
Extent: p. 92
Date: 2014
Keywords: Invasive;Heracleum sosnowskyi;Phytotoxicity;Germination
Abstract: The invasive Heracleum sosnowskyi spread across most Europe countries. The giant forb species supress and outcompete native species in natural and semi-natural plant communities changing local biodiversity and landscape in total. Moreover, the species is specific with phototoxic effects by means of photoactive furanocoumarins injurious for human and animal health. In modern ecology the secondary metabolites are considered as significant regulators-mediators in both a plant and an ecosystem. Therefore the study aimed at (i) evaluation of secondary metabolites content, phytotoxicity, and (ii) its accumulation in different parts of H. sosnowskyi throughout the vegetation. The phytotxicity of both invasive species was evaluated in terms of the total phenols content (TPC). Additionally, the biochemical impact on perennial ryegrass (monocots) and winter rapeseed (dicots) seed germination was assessed in aqueous leachates ex situ. Aqueous extracts of 2-yr old H. sosnowskyi exhibited higher phytotoxicity than 1-yr. old plant extracts. The phytotoxic effects of H. sosnowskyi aqueous extracts on the germination depended extract concentration (0.02-0.2%), plant age (1-year, 2-year), plant parts (shoot: stem, leaf, blossom, seed; root) and growth stage (rosette-ripening). The phytotoxicity of H. sosnowskyi determined extract was most strong at flowering stage due to highest TPC (30.42 mg ml-1). All parts of H. sosnowskyi produced phenolics, which inhibited the acceptor-species seed germination.The results suggested that invasive plant species may acquire spreading advantage in new territories through use of their allelochemicals to inhibit germination. Therefore, it is not only H. sosnowskyi giant size, vigorous uptake of nutrients, and reproduction of high seed yield but also biochemical activity that substantially contributes to the success of this invasive plant. [...]
Affiliation(s): Vytauto Didžiojo universitetas
Žemės ūkio akademija
Appears in Collections:Universiteto mokslo publikacijos / University Research Publications

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