Uniconazole has been used to improve starch production in plants through the regulation of endogenous hormone levels. Here, we reported the effect of this compound on the starch accumulation in a duckweed plant (Lemna aequinoctialis). L. aequinoctialis was grown in Hoagland medium supplemented with different uniconazole concentrations: 400, 800, and 1600 mg/L. The results showed that treatment with 800 mg/L uniconazole significantly increased plant growth rate, doubling time and its chlorophyll

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... content. Consequently, the starch content also increased by 1.5 fold upon treatment with 800 mg/L uniconazole. We, therefore, concluded that uniconazole treatment offers an effective means to enhance the production of starch in L. aequinoctialis.