Journal of Chemical Ecology

, Volume 31, Issue 6, pp 1339–1352 | Cite as

Confirmation of Potential Herbicidal Agents in Hulls of Rice, Oryza sativa

Article

Abstract

An ethyl acetate extract of Oryza sativa (rice) hulls yielded seven compounds: hentriacontane, 1-tetratriacontanol, β-sitosterol, momilactone A, momilactone B, tricin (a flavonoid), and β-sitosterol-3-O-β-d-glucoside. The structures of these compounds were elucidated with 500 MHz nuclear magnetic resonance (NMR), using 1D and 2D spectral methods, aided by electron ionization mass spectrometry (EI–MS), fast atom bombardment mass spectrometry (FAB–MS), infrared (IR), and ultraviolet (UV) spectrophotometry. The complete 1H NMR assignments for momilactone A and B and 13C NMR assignments for tricin are discussed. To the best of our knowledge, hentriacontane, 1-tetratriacontanol, and β-sitosterol-3-O-β-d-glucoside were identified for the first time in rice hulls. In biological activity tests using these identified compounds, momilactone A and B showed potent inhibitory activity against duckweed (Lemna paucicostata). 1-Tetratriacontanol and β-sitosterol-3-O-β-d-glucoside also showed about 13–20% inhibitory activity based on chlorophyll reduction. Hentriacontane and β-sitosterol did not show any herbicidal activity. In a germination assay of three weed species (Leptochloa chinenesis L., Amaranthus retroflexus L., and Cyperus difformis L.) in culture tubes both momilactones A and B had high inhibitory effects. Momilactone B completely inhibited germination of all three weed species at 20 ppm. Germination of L. chinensis L. was completely inhibited by a 4 ppm solution of momilactone B.

Key Words

Oryza sativa L. Gramineae rice hull composition hentriacontane 1-tetratriacontanol β-sitosterol momilactone A momilactone B tricin β-sitosterol-3-O-β-d-glucoside herbicidal activity Lemna paucicostata Hegelm 381 germination assay in culture tube. 

Notes

Acknowledgment

The authors wish to acknowledge in the financial support of the Rural Development Administration made in the Biogreen 21 project year of 2004.

Supplementary material

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Supplementary material (106304 KB)

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Copyright information

© Springer Science + Business Media, Inc. 2005

Authors and Affiliations

  1. 1.Department of Applied Life Science, College of Life and Environment ScienceKonkuk UniversitySeoulSouth Korea

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