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Inhibition of radish germination and root growth by coumarin and phenylpropanoids
G Aliotta1, G Cafiero, A Fiorentino
1Dipartimento di Biologia Vegetale, Università Federico 1I, via Foria 223, I-80139, Napoli, Italy.
Abstract:
Thirteen natural and synthetic phenylpropanoids as well as coumarin (2×10(4)M) were tested for their biological activity on radish germination and subsequent root growth in light and darkness. Coumarin was the most potent inhibitor. With some exceptions, phenylpropanoids with a carboxylic group in the side chain inhibited root growth. Coumarin was formed spontaneously by photooxidation of 2-hydroxycinnamic acid. Microscopic observations of root treated with coumarin suggest that this substance inhibits the elongation of cells of the differentiating zone of the root.
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