Abstract
Allelopathic activity of rice extracts and root exudates against Echinochloa crus-galli increased by heavy metal, cantharidin and jasmonic acid treatments. Since cantharidin (protein phosphatase inhibitor) acts as an elicitor and jasmonic acid is an important signaling molecule regulating inducible defense genes against the pathogen infection, heavy metal stress and pathogen infection may increase alleopathic activity of rice. These treatments also increased the concentrations of momilactone B in rice extracts and root exudates, suggesting that the production of momilactone B in rice and the secretion of momilactone B from rice into the rhizosphere may be enhanced by the treatments. As momilactone B possesses strong phytotoxic and allelopathic activities, the elevated production and secretion of momilactone B of rice by heavy metals, cantharidin and jasmonic acid may contribute to the increasing allelopathic activity of rice. Enhancement of the secretion of momilactone B into the rhizosphere may provide a competitive advantage for root establishment through local suppression of pathogen and inhibition of the growth of competing plant species. Therefore, allelopathy of rice may be one of the inducible defense mechanisms and may be regulated several environmental factors.
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Kato-Noguchi, H. Stress-induced allelopathic activity and momilactone B in rice. Plant Growth Regul 59, 153–158 (2009). https://doi.org/10.1007/s10725-009-9398-4
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DOI: https://doi.org/10.1007/s10725-009-9398-4