diplomsko delo
Sabina Bračič (Author), Nina Šajna (Mentor)

Abstract

V diplomskem delu je bil naš predmet zanimanja alelopatski vpliv učinkovanja križnice navadne česnovke (Alliaria petiolata) na kalitev semen vrtne kreše (Lepidium sativum). Obstajajo študije, ki nakazujejo, da je česnovke alelopatska in čedalje pogosteje je česnovka prepoznana kot globalna invazivne vrsta. prvič so o njej poročali v Severni Ameriki leta 1868 na Long Islandu v New Yorku. Od takrat se je razširila po vsej celini in se sedaj nahaja vsaj v 34 državah ZDA in 4 Kanadskih provincah. V svojem domorodnem okolju ni posebej dominantna. Zanimalo nas je, ali bi invazivnost v novem okolju lahko bila posledica njene potencialne alelopatske učinkovitosti. Ker hipoteze o uspešnosti tujerodnih invazivk pogosto vključujejo idejo, da se s prenosom vrste v novo okolje na vrsto zmanjša pritisk njenih herbivorov, parazitov in patogenov. V diplomskem delu smo primerjali alelopatski potencial listov mladih rozet česnovke (listi necvetoče rastline) in liste cvetoče rastline. Dodatno smo raziskali prisotnost hlapljivih substanc svežih listov necvetočih in cvetočih rastlin, ter vzorce tal pod sestojem česnovke, ki bi lahko vsebovali snovi, ki bi negativno vplivale na kalitev semen vrtne kreše. Da bi lažje sklepali na potencialni zaviralni učinek, smo primerjali še vzorce tal 1 m, 2 m in 3 m stran od centra sklenjenega sestoja česnovke. S pomočjo bioloških testov smo raziskali zaviralni učinek vodnih ekstratov listov necvetočih in cvetočih osebkov česnovke na kalitev semen vrtne kreše ter vpliv na zgodnji ontogenetski razvoj kalic v primerjavi s kontrolnimi poskusi. Rezultate zaviralnega učinka smo ovrednotili s pomočjo analize kalivosti in z meritvami razvoja kalice - z merjenjem dolžine korenine in celotne kalice vrtne kreše. Iz podatkov lahko razberemo, da imajoi vodotopni ekstrakti listov necvetočih rastlin močnejši zaviralni učinek na kalitev in rast kalic kot vodotopni ekstrakti listov cvetočih rastlin. Ugotovili smo tudi, da vzorci tal pod sestojem česnovke vplivajo na kalitev semen vrtne kreše, ter da se z oddaljenostjo od sestoja česnovke njihov vpliv manjša. Dolžina celotne kalice, kakor tudi dolžina korenine vrtne kreše, prav tako pa tudi odstotek kalitve semen z naraščanjem koncentracije vodotopnih ekstraktov se majša.

Keywords

diplomska dela;alelopatija;semena;kalitev;navadna česnovka;vrtna kreša;vodni ekstrakti;hlapljive substance;vzorci tal;

Data

Language: Slovenian
Year of publishing:
Typology: 2.11 - Undergraduate Thesis
Organization: UM FNM - Faculty of Natural Sciences and Mathematics
Publisher: [S. Bračič]
UDC: 581.524.13:582.683.2(043.2)
COBISS: 21932040 Link will open in a new window
Views: 731
Downloads: 0
Average score: 0 (0 votes)
Metadata: JSON JSON-RDF JSON-LD TURTLE N-TRIPLES XML RDFA MICRODATA DC-XML DC-RDF RDF

Other data

Secondary language: English
Secondary title: Test of potentially allelopathic ability of Alliaria peticolata (Bieb.) Cavara & Grande
Secondary abstract: The diploma thesis deals with potentially allelopathic effect of garlic mustard (Alliaria petiolata) on germination of garden cress (Lepidium sativum). It is becoming increasingly acknowledged, that garlic mustard is becoming a globally invasive species. Indications exist that its invasive success might be a result of allelopathy. In our study we wanted to test if garlic mustard can show allelopathic potential, since it is not particularly dominant in its indigenous environment. We have used bioassays to study we wanted to test if garlic mustard can show allelopathic potential, since it is not particulary dominant in its indigenous environment. We have used bioassays to study the inhibitory effect of aqueous extracts of young leaves from non-flowering rosettes and old leaves from flowering garlic mustard rosettes. The presence of extracts decreased the germination and seedling development of garden cress seeds. Furthermore, we tested the presence of volatile potentially allelopathic substances in leaves from flowering and non-flowering rosettes. We studied as well the inhibitory effect of soil samples, collected in a transect representing a gradient of the distance from the dense garlic mustard stand. We recorded the germination rate and seedling development measured through the length of the gaden cress seedling and its radicle. The data shows that water soluble extracts of young leaves from flowering rosettes have a stronger inhibitory effect on the germination and seedling growth than extracts of old leaves from flowering rosettes. Similarly, the germination rate of garden cress seeds in experiments, suggesting the presence of volatile inhibitory substances, which might be released into environment. Results also indicated that soil samples near the garlic mustard stands were less suitable for the germination of garden cress than samples taken further away from the stand.
Secondary keywords: theses;allelopathy;seeds;germination;garlic mustard;garden cress;water extracts;volatile substances;soils samples;
URN: URN:SI:UM:
Type (COBISS): Undergraduate thesis
Thesis comment: Univ. v Mariboru, Fak. za naravoslovje in matematiko, Oddelek za biologijo
Pages: VII, 32 f.
ID: 10961800