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Research Journal of Botany
Year: 2007  |  Volume: 2  |  Issue: 1  |  Page No.: 23 - 32

Phytotoxic Effects of Tithonia diversifolia on Germination and Growth of Oryza sativa

O.J. Ilori, O.O. Otusanya and A.A. Adelusi    

Abstract: The effect of phytotoxins produced from Tithonia diversifolia weed was investigated with a view to understanding the strategies used by this weed to suppress the growth of associated crops. The study examined the susceptibility of Oryza sativa Linn. to phytotoxic effects of Tithonia diversifolia (Hemsl) A. Gray, compare the phytotoxicity of the plant parts of T. diversifolia and determine the effect of drying on the phytotoxic activity of this weed. The effects of the aqueous extracts prepared from the shoots and roots of T. diversifolia on Oryza sativa were obtained by subjecting the seedlings to the different aqueous extract treatments. Results showed that the growth parameters and fresh and dry matter production of Oryza sativa were retarded by all the four different aqueous extracts applied. The retardation was more pronounced in older plants. The degree of retardatory effects of the aqueous extracts were found to follow this order: Fresh shoot aqueous extract (FSE)>dry shoot aqueous extract (DSE)>fresh root aqueous extract (FRE)>dry root aqueous extract (DRE). There was a significantly higher phytotoxic potency at p<0.05 in the fresh tissue aqueous extract compared with the dry tissue aqueous extract as well as in the shoot aqueous extract compared to the root aqueous extract. This study concluded that Tithonia diversifolia was an allelopathic weed with water-soluble allelochemicals in its plant parts and had such phytotoxic potency that could suppress the growth of associated crop plants.

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