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Catechin is a phytototoxin and a pro-oxidant secreted from the roots of Centaurea stoebe.
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When applied to the roots of Arabidopsis thaliana, the phytotoxin (±)-catechin triggers a wave of reactive oxygen species (ROS), leading to a cascade of genome-wide changes in gene expression and, ultimately, death of the root system. Biochemical links describing the root secreted phytotoxin,
Elucidation of a diurnal pattern of catechin exudation by Centaurea stoebe.
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The exudation of secondary metabolites at phytotoxic concentrations has been proposed as a mechanism of invasion for some exotic plant species. Catechin is a natural flavanoid implicated in the potential allelopathic interactions of Centaurea stoebe. However, recent studies have shown that catechin
(±)-catechin, a root exudate of the invasive centaurea stoebe lam. (Spotted knapweed) exhibits bacteriostatic activity against multiple soil bacterial populations.
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Understanding the effects of allelopathic plant chemicals on soil microorganisms is critical to understanding their ecological roles and importance in exotic plant invasion. Centaurea stoebe Lam. (spotted knapweed), an aggressive invasive weed in North America, secretes a racemic mixture of
The case against (-)-catechin involvement in allelopathy of Centaurea stoebe (spotted knapweed).
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Proving allelopathic chemical interference is a daunting endeavor, in that production and movement of a phytotoxin from a donor plant to a receiving plant must be demonstrated in the substrate in which the plants grow, which is usually a complex soil matrix. The soil levels or soil flux levels of
Is (-)-catechin a novel weapon of spotted knapweed (Centaurea stoebe)?
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The novel weapons hypothesis states that some invasive weed species owe part of their success as invaders to allelopathy mediated by allelochemicals that are new to the native species. Presumably, no resistance has evolved among the native species to this new allelochemical (i.e., the novel weapon).
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