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Jurnal Pendidikan Sains

Abstract

Noni fruit (Morinda citrifolia) contains secondary metabolites that may have potential bioherbicidal activity. This preliminary laboratory experiment aimed to identify flavonoids and tannins in noni fruit extract and to describe the phytotoxic responses of water hyacinth (Eichhornia crassipes) exposed to different extract concentrations. Noni fruit was extracted with 96% ethanol by maceration and concentrated using a rotary evaporator. The extract was qualitatively screened for flavonoids and tannins and applied to water hyacinth at concentrations of 0%, 10%, 20%, 30%, and 50% (v/v), with three plants per treatment. Plant responses were observed for 25 days and analyzed descriptively based on visible phytotoxic symptoms, mortality, time to mortality, and new shoot formation. Qualitative screening indicated the presence of flavonoids and tannins in the extract. By Day 25, all extract-treated plants (3/3 per concentration) were dead, whereas all control plants remained alive. The first observed mortality occurred on Day 10 at 50%, Day 13 at 30%, Day 18 at 20%, and Day 25 at 10%. Visible injury also appeared and progressed earlier at higher concentrations. No new shoots were observed in either the treated or control plants; therefore, shoot-growth inhibition could not be determined. These preliminary findings indicate potential bioherbicidal activity of noni fruit extract against water hyacinth, characterized by visible phytotoxic injury and mortality, with earlier responses observed at higher extract concentrations. Further controlled experiments with larger sample sizes and randomized treatment allocation are required to confirm concentration-dependent effects.

First Page

343

Last Page

353

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