Kava root (Piper methysticum L.) as a potential natural herbicide and fungicide

Xuan, Tran Dang; Ogushi, Yuichi; Junko, Chikara; Tsuzuki, Eiji; Terao, Hiromitsu; Matsuo, Mitsuhiro; Khanh, Tran Dang; Hong, Nguyen Huu

doi:10.1016/s0261-2194(03)00083-8

Cited by 27 publications

(26 citation statements)

References 14 publications

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“…Incorporation of buckwheat pellets at 2 t ha -1 also resulted in strong paddy weed reduction. Kava controlled weeds in paddy remarkably at 1 t ha -1 and increased tillering and root count of rice plant (Xuan et al, 2003a).…”

Section: Phytotoxic Effectsmentioning

confidence: 97%

“…The effects of allelopathic plant residues on weed growth last for a short time, and later the weeds re-emerge (Xuan et al, 2003a). Sorgoleone from the root exudate of sorghum (Sorghum bicolor L.) persisted in soil for 8 weeks in detectable limits but its concentration was decreased drastically within 1 week (Weston et al, 1999).…”

Section: Toxicity Dynamicsmentioning

confidence: 99%

“…Xuan and Tsuzuki (2002) observed a maximum weed control of 91.5% when alfalfa (Medicago sativa L.) pellets were applied immediately after watering the soil, but after 20 days, only 55.3% weeds were controlled. Kava (Piper methysticum L.) exhibited the strongest inhibition (80%) on barnyard grass and monochoria growth 1 day after application but at 9 days, the weed control was reduced to 25% (Xuan et al, 2003a). Xuan et al (2005) reported that both alfalfa and kava strongly inhibited barnyard grass and monochoria weed growth until 10 days (80-100% control), and after 20-25 days, weed control was reduced to 50%.…”

Section: Toxicity Dynamicsmentioning

confidence: 99%

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Allelochemicals: sources, toxicity and microbial transformation in soil —a review

et al. 2008

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Soil microorganisms interact with plants in diversified manner ranging from mobilising nutrients and enhancing their growth, to inducing diseases. They also produce allelochemicals directly or indirectly through conversion from other compounds. In order to hamper plant growth, allelochemicals must accumulate and persist at phytotoxic levels in the rhizosphere soil. However, after their entry into environment, persistence, availability and biological activities of allelochemicals are influenced by microorganisms. Transformation of allelochemicals by soil microbes may result into the compounds with modified biological properties. Such bio-transformations affect the overall allelopathic capability of the producer plant in a direct manner. Several reports describe the allelopathic significance of microbial metabolism products. For instance, a bacterium Actinetobacter calcoaceticus, can convert 2(3H)-benzoxazolinone (BOA) to 2,2´-oxo-l,l´-azobenzene (AZOB) which is more inhibitory to some plants. On the contrary, bacterium Pseudomonas putida catabolises juglone in soils beneath walnut trees; otherwise, juglone accumulates at phytotoxic levels. This review article describes the nature of microbially produced allelochemicals, and the ways to mediate microbial degradation of putative allelochemicals. The given information develops an understanding of persistence, fate and phytotoxicity of allelochemicals in the natural environment, and also points out the possible solution of the problems due to microbial interventions in the soil.

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Section: Phytotoxic Effectsmentioning

confidence: 97%

Section: Toxicity Dynamicsmentioning

confidence: 99%

Section: Toxicity Dynamicsmentioning

confidence: 99%

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Allelochemicals: sources, toxicity and microbial transformation in soil —a review

et al. 2008

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“…Kavalactones such as desmethoxyyagonin, kavain, 7,8-dihydrokavain, yagonin, methysticin, and dihydromethysticin have been shown to possess herbicidal and antifungal activities (Xuan et al, 2006). Kava powder, upon degradation, also releases a range of phenolic compounds that were considered responsible for inhibiting barnyard weed germination and growth for 25 days after application (Xuan et al, 2003;Xuan et al, 2005). Phenolic compounds released from a range of other organic amendments are also known to have nematicidal properties (Dijan-Cporalino et al, 2006;.…”

Section: Discussionmentioning

confidence: 99%

“…Khurma and Singh (2005) reported nematicidal effects of kava powder on root-knot nematodes. In addition to nematicidal activity, kava powder has been reported to possess herbicidal activity against barnyard weed (Xuan et al, 2003;Xuan et al, 2005).…”

Section: Introductionmentioning

confidence: 99%

Assessing the potential of kava (Piper methysticum Forst) and wild kava (Piper aduncum L.) as organic amendments for managing root-knot nematodes

Singh¹,

Khurma²

2008

S. Pac. J. Nat. App. Sci.

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Antimicrobial activity and mechanism of action of a thionin‐like peptide from Capsicum annuum fruits and combinatorial treatment with fluconazole against Fusarium solani

et al. 2017

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Many Fusarium species are able to cause severe infections in plants as well as in animals and humans. Therefore, the discovery of new antifungal agents is of paramount importance. CaThi belongs to the thionins, which are cationic peptides with low molecular weights (∼5 kDa) that have toxic effects against various microorganisms. Herein, we study the mechanism of action of CaThi and its combinatory effect with fluconazole (FLC) against Fusarium solani. The mechanism of action of CaThi was studied by growth inhibition, viability, plasma membrane permeabilization, ROS induction, caspase activation, localization, and DNA binding capability, as assessed with Sytox green, DAB, FITC-VAD-FMK, CaThi-FITC, and gel shift assays. The combinatory effect of CaThi and FLC was assessed using a growth inhibition assay. Our results demonstrated that CaThi present a dose dependent activity and at the higher used concentration (50 µg mL ) inhibits 83% of F. solani growth, prevents the formation of hyphae, permeabilizes membranes, induces endogenous H O , activates caspases, and localizes intracellularly. CaThi combined with FLC, at concentrations that alone do not inhibit F. solani, result in 100% death of F. solani when combined. The data presented in this study demonstrate that CaThi causes death of F. solani via apoptosis; an intracellular target may also be involved. Combined treatment using CaThi and FLC is a strong candidate for studies aimed at improved targeting of F. solani. This strategy is of particular interest because it minimizes selection of resistant microorganisms.

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Kava root (Piper methysticum L.) as a potential natural herbicide and fungicide

Cited by 27 publications

References 14 publications

Allelochemicals: sources, toxicity and microbial transformation in soil —a review

Allelochemicals: sources, toxicity and microbial transformation in soil —a review

Assessing the potential of kava (Piper methysticum Forst) and wild kava (Piper aduncum L.) as organic amendments for managing root-knot nematodes

Antimicrobial activity and mechanism of action of a thionin‐like peptide from Capsicum annuum fruits and combinatorial treatment with fluconazole against Fusarium solani

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