20.500.12556/RUL-142963 HPLC-DAD-MS identification and quantification of phenolic components in japanese knotweed and american pokeweed extracts and their phytotoxic effect on seed germination We performed a detailed HPLC-MSn analysis of the phenolic compounds from the extracts of two invasive alien plant species (IAPS): Japanese knotweed (Fallopia japonica (Houtt.) Ronse Decr.) and American pokeweed (Phytolacca americana L.). The major phenolic groups were hydroxycinnamic acids and flavanols in Japanese knotweed (J. knotweed) and flavonols, hydroxycinnamic acids, and stilbenes in American pokeweed (A. pokeweed). We investigated the influence of solvent type and extraction time on the extraction efficiency of the phenolic compounds. The solvent 80% methanol had a higher polyphenolic extraction efficiency than water, since 14.5 times more flavonols and 2.3 times more stilbenes were extracted from J. knotweed and 5.2 times more flavonols and 2.6 times more stilbenes were extracted from A. pokeweed. In contrast, with water, we obtained a 52% higher hydroxycinnamic acids (HCA) content from J. knotweed. Hydroxycinnamic acids were best extracted in water after 24 h, flavanols after 12 h, stilbenes between 12 and 24 h, and flavonol glycosides after 48 h of extraction. We also tested the allelopathic effect of the aqueous extract of A. pokeweed and J. knotweed on seed germination and shoot and root growth of perennial ryegrass. The results showed that the water extract of J. knotweed resulted in 38 to 48% lower seed germination of perennial ryegrass, and the extract of A. pokeweed resulted in 83 to 90% lower seed germination. The phytotoxic effect of the extract of J. knotweed and A. pokeweed was also reflected in a characteristic reduced growth of shoots and roots of perennial ryegrass. The phytotoxic action of IAPS could also be applied for beneficial purposes, since this would be an effective strategy for their control and a reduction of their spread in the environment. invasive alien plant species Japanese knotweed American pokeweed phenolic compounds HPLC-MS phytotoxic effect germination invazivne tujerodne rastlinske vrste japonski dresnik ameriški pokeweed Fallopia japonica Phytolacca americana fenolne spojine fitotoksični učinek kalitev true false true Angleški jezik Slovenski jezik Članek v reviji 2022-12-06 12:16:34 2022-12-06 12:16:40 2022-12-07 03:32:28 0000-00-00 00:00:00 2022 0 0 16 str. iss. 22, art. 3053 Vol. 11 2022 0000-00-00 Zaloznikova Objavljeno NiDoloceno 0000-00-00 0000-00-00 0000-00-00 63 2223-7747 10.3390/ plants11223053 Academic Editors: 132510979 plants-11-03053-v2.pdf plants-11-03053-v2.pdf 1 6CAC47901BC28AD1BBFC5D0F36AD062F 798d68d3ab07f3850d7eba1b8cadf8e557f532e3595495550b76b601462d7f06 5e50755b-7558-11ed-9c94-00155dcfd717 https://repozitorij.uni-lj.si/Dokument.php?lang=slv&id=164552 https://www.mdpi.com/2223-7747/11/22/3053 0 4d53198e-7557-11ed-9c94-00155dcfd717 https://repozitorij.uni-lj.si/Dokument.php?lang=slv&id=164551 Biotehniška fakulteta 0 0 0