20.500.12556/RUP-23109 Impact of the invasive South African ragwort on germination and growth of radish The South African ragwort Senecio inaequidens is among the most invasive plant species in Europe, especially in mountainous and Mediterranean regions, and is suspected to exert allelopathic effects (release of chemical inhibitors) on native vegetation. This study investigated the allelopathic potential of South African ragwort using radish Raphanus sativus as a model species. In laboratory experiments, I treated radish seeds with ragwort leaf extracts at varying concentrations. After three days, the extract reduced radish seed germination by up to 40% in a concentration-dependent manner. High extract concentrations significantly inhibited radish seedling root length, whereas lower concentrations rather stimulated root growth. Measurements of oxidative stress-related parameters, including lipid peroxidation and total antioxidative ca- pacity, showed no changes in treated roots. In a complementary pot experiment, I exposed radish seeds for 36 days to pul- verised ragwort leaves mixed with vermiculite. This treatment delayed, but did not suppress seed germination. Subsequent plant growth and physiological status remained unaffected. The results suggest that South African ragwort exerts moder- ate allelopathic effects, primarily influencing seedlings, whereas mature plants appear less sensitive to its allelochemicals. Južnoafriški grint (Senecio inaequidens) sodi med najbolj invazivne rastlinske vrste v Evropi, zlasti v gorskih in sredozemskih območjih, pri čemer obstaja sum, da na domorodno vegetacijo deluje alelopatsko (z izločanjem kemičnih snovi, ki zavirajo rast drugih rastlin). V tej raziskavi smo preučevali alelopatski potencial južnoafriškega grinta z uporabo redkvice (Raphanus sativus) kot modelne vrste. V laboratorijskih poskusih sem semena redkvice obdelal z izvlečki listov grinta različnih koncentracij. Po treh dneh je izvleček zmanjšal kalitev semen redkvice za do 40 %, pri čemer je bil učinek odvisen od koncentracije. Visoke koncentracije izvlečka so značilno zavrle rast korenin mladih rastlin, medtem ko so nižje koncentracije rast korenin celo spodbudile. Meritve parametrov, povezanih z oksidativnim stresom, vključno z lipidno peroksidacijo in skupno antioksidativno kapaciteto, v obdelanih koreninah niso pokazale sprememb. V dopolnilnem lončnem poskusu sem semena redkvice 36 dni izpostavljal zmletim listom grinta, pomešanim z vermikulitom. Takšna obdelava je kalitev semen upočasnila, ni pa je zavrla. Nadaljnja rast rastlin in njihovo fiziološko stanje sta ostala nespremenjena. Rezultati kažejo, da ima južnoafriški grint zmeren alelopatski učinek, ki vpliva predvsem na mlade rastline oziroma kalice, medtem ko so razvitejše rastline očitno manj občutljive na njegove alelokemikalije. allelopathy oxidative stress phytotoxicity Raphanus sativus South African ragwort Senecio inaequidens alelopatija oksidativni stres fitotoksičnost Raphanus sativus raznozobi grint Senecio inaequidens true false true Angleški jezik Slovenski jezik Članek v reviji 2026-06-04 15:35:59 2026-06-04 15:36:04 2026-06-06 03:05:48 0000-00-00 00:00:00 2026 0 0 str. 1-7 iss. 1 Vol. 74 2026 0000-00-00 Zaloznikova NiDoloceno NiDoloceno 0000-00-00 0000-00-00 2026-05-27 581.524.13 1505-2249 280525827 RAZ_Soln_Katarina_2026.pdf RAZ_Soln_Katarina_2026.pdf 1 6DC8BBC14388E3DC77103F502F987A0A 0f5bb279642779896edf081412df749f8d0c45002638009b53a3a31c7363fa03 4f395f46-601a-11f1-9e8d-005056ac49c0 https://repozitorij.upr.si/Dokument.php?lang=slv&id=33761 https://bioone.org/journals/polish-journal-of-ecology/volume-74/issue-1/15052249PJE2026.74.002/Impact-of-the-Invasive-South-African-Ragwort-on-Germination-and/10.3161/15052249PJE2026.74.002.full 1 341c93a8-601a-11f1-9e8d-005056ac49c0 https://repozitorij.upr.si/Dokument.php?lang=slv&id=33760 Fakulteta za matematiko, naravoslovje in informacijske tehnologije 0 0 0