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- W2135082102 abstract "• The flavonol (±)-catechin is an allelochemical produced by the invasive weed Centaurea maculosa (spotted knapweed). The full effects of (±)-catechin on plant communities in both the native and the introduced ranges of C. maculosa remain uncertain. • Here, by supplementing plant growth media with (±)-catechin, we showed that low (±)-catechin concentrations may induce growth and defense responses in neighboring plants. Doses of the allelochemical lower than the minimum inhibitory concentration (MIC) induced growth in Arabidopsis thaliana; plants treated with 25 µg ml−1 (±)-catechin accumulated more than twice the biomass of untreated control plants. Further, pretreatment of A. thaliana roots with low concentrations of (±)-catechin induced resistance to the bacterial pathogen Pseudomonas syringae pv. tomato DC3000 in A. thaliana leaves. • Low doses of (±)-catechin resulted in moderate increases in reactive oxygen species (ROS) in the meristems of treated plants, which may have loosened the cell walls and thus increased growth. Experiments with A. thaliana mutants indicated that (±)-catechin induces pathogen resistance by up-regulating defense genes via the salicylic acid (SA)/nonexpressor of pathogenesis related protein 1 (NPR1)-dependent pathway. • Our results suggest that the growth and defense-inducing effects of (±)-catechin are concentration dependent, as (±)-catechin at higher concentrations is phytotoxic, thus suggesting the potential for hormesis to occur in nature." @default.
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- W2135082102 date "2006-12-21" @default.
- W2135082102 modified "2023-10-15" @default.
- W2135082102 title "Chemical facilitation and induced pathogen resistance mediated by a root‐secreted phytotoxin" @default.
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- W2135082102 doi "https://doi.org/10.1111/j.1469-8137.2006.01964.x" @default.
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