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Assessment of allelopathic activity of Tradescantia spathacea Sw. for weed control

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Abstract

Tradescantia spathacea Sw. (Commelinaceae) is widely cultivated as an ornamental and medicinal plant in Southeast Asia, and its pharmacological properties are well known. On the other hand, this plant species is classified as an invasive weed in some countries. As a noxious weed, T. spathacea has been reported to disrupt the growth of native plants. However, no study has reported on its allelopathic activity. Thus, we investigated the allelopathic property and inhibitory substance of T. spathacea. The extracts of T. spathacea significantly inhibited the shoots and roots of alfalfa (Medicago sativa L.), cress (Lepidium sativum L.), lettuce (Lactuca sativa L.), barnyard grass (Echinochloa crus-galli (L.) P. Beauv.), Italian ryegrass (Lolium multiflorum Lam.), and timothy (Phleum pratense L.) at concentrations ≥ 3 mg dry weight (D.W.) equivalent extract/mL. As the extract concentration increased, the growth of the shoots and roots decreased. The I50 values of the test plant shoots and roots were 11.6–72.4 and 5.4–19.5 mg D.W. equivalent extract/mL, respectively. The extracts were purified by column chromatography, and an inhibitory substance was separated, which inhibited the shoots and roots of cress to 18.8 and 11.6% of control growth, respectively. The results of present findings indicate that T. spathacea extracts possess an allelopathic property, and its inhibitory substance may contribute this activity.

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All data analyzed during this study are included in this article.

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Acknowledgements

We are thankful to Professor Dennis Murphy for editing the English of the manuscript.

Funding

This study was funded by MEXT scholarship (Grant Number is MEXT-192584) from the Government of Japan.

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EHK performed the experiments, analyzed the data and wrote the manuscript. HKN designed the experiments, supervised the data analysis and greatly contributed to the writing of the manuscript. The manuscript has been read and approved by both authors.

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Correspondence to Ei Han Kyaw.

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Kyaw, E.H., Kato-Noguchi, H. Assessment of allelopathic activity of Tradescantia spathacea Sw. for weed control. BIOLOGIA FUTURA 72, 489–495 (2021). https://doi.org/10.1007/s42977-021-00098-w

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  • DOI: https://doi.org/10.1007/s42977-021-00098-w

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