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- Title
Allelopathy and exotic plant invasion: from molecules and genes to species interactions.
- Authors
Bais, Harsh P; Vepachedu, Ramarao; Gilroy, Simon; Callaway, Ragan M; Vivanco, Jorge M
- Abstract
Here we present evidence that Centaurea maculosa (spotted knapweed), an invasive species in the western United States, displaces native plant species by exuding the phytotoxin (-)-catechin from its roots. Our results show inhibition of native species' growth and germination in field soils at natural concentrations of (-)-catechin. In susceptible species such as Arabidopsis thaliana, the allelochemical triggers a wave of reactive oxygen species (ROS) initiated at the root meristem, which leads to a Ca2+ signaling cascade triggering genome-wide changes in gene expression and, ultimately, death of the root system. Our results support a "novel weapons hypothesis" for invasive success.
- Publication
Science (New York, N.Y.), 2003, Vol 301, Issue 5638, p1377
- ISSN
1095-9203
- Publication type
Journal Article
- DOI
10.1126/science.1083245