Abstract
The overall goal of the project was to test the hypothesis that Lamium amplexicaule and Lamium purpureum, weedy invasive species to North America, use phytotoxic allelochemicals in interplant competition. The chemical compositions of the essential oils from the aerial parts of L. amplexicaule and L. purpureum have been obtained by hydrodistillation and analyzed by gas chromatography-mass spectrometry. The essential oils and several essential oil components have been screened for phytotoxic activity on lettuce (Lactuca sativa) and perennial ryegrass (Lolium perenne) as well as nematocidal activity against Caenorhabditis elegans, brine shrimp (Artemia salina) lethality, and insecticidal activity against the red imported fire ant (Solenopsis invicta × richteri). L. amplexicaule essential oil was composed largely of α-pinene, β- pinene, 1-octen-3-ol, (E)-caryophyllene, and germacrene D, while L. purpureum oil was dominated by α-pinene, β-pinene, 1-octen-3-ol, β-elemene, and germacrene D. Neither essential oil exhibited notable phytotoxicity or lethality against nema-todes, brine shrimp, or fire ants. It is unlikely, therefore, that the allelopathy observed in these Lamium species is due to volatile phytochemical constituents.
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Claims 3
Claim · model-written summary
L. amplexicaule oil consisted largely of five named constituents.
- Taxon
- L. amplexicaule
Lamium amplexicaulee0 - Outcome
- α-pinene, β- pinene, 1-octen-3-ol, (E)-caryophyllene, and germacrene De0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“L. amplexicaule essential oil was composed largely of α-pinene, β- pinene, 1-octen-3-ol, (E)-caryophyllene, and germacrene D”
Claim · model-written summary
L. purpureum oil was dominated by five named constituents.
- Taxon
- L. purpureum
Lamium purpureume0 - Outcome
- α-pinene, β-pinene, 1-octen-3-ol, β-elemene, and germacrene De0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“L. purpureum oil was dominated by α-pinene, β-pinene, 1-octen-3-ol, β-elemene, and germacrene D”
Claim · model-written summary
Neither essential oil showed notable phytotoxicity to the tested plants.
- Taxon
- lettuce
Lactuca sativat0 - Treatment
- essential oile0
- Outcome
- phytotoxicitye0
- Direction
- Neithere0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Neither essential oil exhibited notable phytotoxicity”
t0“lettuce (Lactuca sativa)”
The same questions in other papers
botanical · crop injury · Lactuca sativa (garden lettuce)Positive and negative results
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- positive
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See all 21 papers →Claims are grouped by organism, treatment and what was measured or targeted. A paper counts as positive when any of its claims in the group is positive.