Root and leaf extract allelopathic effect of Limnocharis flava on seed germination and growth of rice.

Limnocharis flava is an invasive plant in Sri Lanka that highly invading in paddy fields and riparian ecosystems. In present study we assess the allelopathic potential of leaves and roots of Limnocharis flava with the Oryza sativa seedlings to evaluate the allelopathic potential of L. flava on the growth of O. sativa. Simple germination assay with randomized block design was occupied as experimental method. High concentrated leaf extract significantly inhibit the seed germination with reducing radicle and hypocotyl elongation. Growth retardation observed with the increasing leaf extract concentration. However root extract concentration increment was not significant compared to the L. flava leaf solutions. This result implies that L. flava leaf extract has high allelopathic potential and it may negatively affect rice seedling growth under field conditions.

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