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Showing 1 to 20 of 25 for “"Centaurea"”.
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Cytotoxic compounds from the genus Centaurea.
… of cytotoxic compounds from the genus Centaurea (Family: Asteraceae alto Compositae), a large genus of about 500 species. The first three chapters deal with an introduction of natural products and Centaurea species, followed by the isolation and characterisation of compounds from twelve …
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Isolation of a Toxic Substance from CENTAUREA REPENS
… steroid-type compound was isolated from Centaurea repens. After extraction with absolute ethanol, removal of the solvent, addition of 2% HCl to precipitate the pigments, and filtering, the pH was adjusted to 9 with aqueous anunonia. This solution was exhaustively extracted with …
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Development and utilization of molecular tools to understand invasion biology in Centaurea maculosa (spotted knapweed)
… in the invasive weed, spotted knapweed (Centaurea maculosa Lam.). In this dissertation, I first introduce the need for research at multiple scales and the potential benefits of collectively examining molecular, physiological and ecological phenomena in an invasive plant. I then give a …
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Predicting Spotted Knapweed (Centaurea maculosa) Range Expansion Near Missoula Montana Using Localized Climate and Elevation Data
Since the 1920s spotted knapweed (Centaurea maculosa) has adapted to a variety of habitats, including pastureland, rangeland, hay land, open forests, road sides, and ditches. In 2003 this plant species dominated more than five million acres in Montana, half of the total infestation of noxious weeds …
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Predicting Spotted Knapweed (Centaurea maculosa) Range Expansion Near Missoula Montana Using Localized Climate and Elevation Data
Since the 1920s spotted knapweed (Centaurea maculosa) has adapted to a variety of habitats, including pastureland, rangeland, hay land, open forests, road sides, and ditches. In 2003 this plant species dominated more than five million acres in Montana, half of the total infestation of noxious weeds …
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Using patchy plant invasions to understand how diffuse interactions modify facilitation and competition
… distributions of two invasive exotic plants, <i>Centaurea stoebe</i> and <i>Bromus tectorum</i>, to explore conditionality in plant interactions and the implications of this conditionality for community invasibility. Additionally, I expanded this research to investigate how these two invaders …
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Using patchy plant invasions to understand how diffuse interactions modify facilitation and competition
… distributions of two invasive exotic plants, <i>Centaurea stoebe</i> and <i>Bromus tectorum</i>, to explore conditionality in plant interactions and the implications of this conditionality for community invasibility. Additionally, I expanded this research to investigate how these two invaders …
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NO SIMPLE TRADEOFFS: CENTAUREA PLANTS FROM AMERICA ARE BETTER COMPETITORS AND DEFENDERS THAN PLANTS FROM THE NATIVE RANGE
… of invasive North American populations of Centaurea maculosa to populations in Europe, where the species is native. I found that Centaurea from North America were larger, but produced fewer flowers than plants from European populations. North American Centaurea demonstrated much stronger …
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NO SIMPLE TRADEOFFS: CENTAUREA PLANTS FROM AMERICA ARE BETTER COMPETITORS AND DEFENDERS THAN PLANTS FROM THE NATIVE RANGE
… of invasive North American populations of Centaurea maculosa to populations in Europe, where the species is native. I found that Centaurea from North America were larger, but produced fewer flowers than plants from European populations. North American Centaurea demonstrated much stronger …
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VARIATION BETWEEN PERIPHERAL AND CENTER ACHENE MORPHOLOGY AND ATTRIBUTES OF ACHENE GERMINATION IN THE INVASIVE SPECIES, <i>CENTAUREA MELITENSIS</i>
… approaches to help control their spread. <em>Centaurea melitensis</em>, a nonnative invasive with European origins, is found in disturbed areas of southern California. It produces three different types of flower heads that develop at different times and at different locations on the plant …
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Effectiveness of Root-Boring Knapweed Weevil (Cyphocleonus achates Fåhr.) Herbivory on Spotted Knapweed (Centaurea stoebe Lam.) in Kamloops, BC: A Five-year Review
Spotted knapweed (Centaurea stoebe) is an Eurasian plant now invasive across North America. The root-boring knapweed weevil (Cyphocleonus achates) is one of 13 approved biocontrol agents. In 2017 and 2018, root-boring knapweed weevils were released at 15 sites across Kamloops, BC, Canada. This …
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ΒΙΟΛΟΓΙΑ ΚΑΙ ΣΥΜΠΕΡΙΦΟΡΑ ΣΤΟ ΕΡΓΑΣΤΗΡΙΟ ΤΟΥ CHAETORELLIA AUSTRALIS HERING (DIPTERA, TEPHRITIDAE), ΕΧΘΡΟΥ ΤΟΥ ΖΙΖΑΝΙΟΥ CENTAUREA SOLSTITIALIS L. (ASTERALES, ASTERACEAE), ΜΕ ΕΜΦΑΣΗ ΣΤΗ ΣΥ...
… PREFERENCE EXPERIMENT IN WHICH FLOWER HEADS OF 7 CENTAUREA SPECIES WERE COMPARED, THE FEMALES DEPOSITED A GREAT NUMBER OF EGGS IN C. SOLSTITIALIS AND C. CYANUS HEADS, ONLY FEW EGGS IN C.CALCITRAPA AND C. SALONITANA HEADS, AND NO EGGS IN C. MACULOSA, C . MACEDONICAAND C. SOLSTITIALIS HEADS. THE …
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Catechin, a novel root exudate of Centaurea stoebe, exhibits pleiotropic effects on the soil microbial community and individual soil isolates, and undergoes chemical changes with numerous abiotic factors from soil
Allelopathy has been studied for (±)-catechin, a root exudate of spotted knapweed, as a plausible mechanism that facilitates knapweed invasion in North America. Phytotoxic effects are observed in invaded fields as well as greenhouse experiments when employing catechin or growing spotted knapweed, …
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Catechin, a novel root exudate of Centaurea stoebe, exhibits pleiotropic effects on the soil microbial community and individual soil isolates, and undergoes chemical changes with numerous abiotic factors from soil
Allelopathy has been studied for (±)-catechin, a root exudate of spotted knapweed, as a plausible mechanism that facilitates knapweed invasion in North America. Phytotoxic effects are observed in invaded fields as well as greenhouse experiments when employing catechin or growing spotted knapweed, …
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Studies on biological activities of Scottish plants.
… indigenous or naturalised to Scotland. Three Centaurea species from Turkey were also investigated to compare the differences in activity between Scottish species and the Turkish species. It also describes the phytochemical investigation of 18 of these species which yielded 45 compounds. The …
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Increasing the success of community transfer when creating species-rich meadows using green hay strewing
… at low frequencies in MG5 Cynosurus cristatus – Centaurea nigra community meadows and with stress-tolerance as part of their life strategy. There was a statistically significant three-way interaction between haying, grazing and disturbance. As several terrestrial orchid species are associated …
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Interplay between competition and evolution in invaded and native plant communities
… spicata when competing with the invasive Centaurea stoebe. I found that tolerance had far greater fitness benefits than suppression. This observation has important consequences for understanding the outcome of evolution in plant communities. In my third chapter, I investigated the …
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Interplay between competition and evolution in invaded and native plant communities
… spicata when competing with the invasive Centaurea stoebe. I found that tolerance had far greater fitness benefits than suppression. This observation has important consequences for understanding the outcome of evolution in plant communities. In my third chapter, I investigated the …
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