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Effects of aqueous extract of rice plants (Oryza sativa L.) on seed germination and radicle elongation of Monochoria vaginalis var. plantaginea

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Abstract

Laboratory experiments were conducted to examine the allelopathic potentials of rice plants (Oryza sativa L.) on seed germination and radicle elongation of Monochoria vaginalis (Burm. f.) Presl var. plantaginea (Roxb.) Solms-Laubat. To compare the relative allelopathic potentials of rice plants at different growth stages, aqueous extracts of dried tissues were obtained from the seeds, husks, and seedlings harvested 10, 20, 40 and 120 days after seeding. When M. vaginalis seeds were incubated in solutions containing aqueous extracts, significant increases in the germination rate were observed for all the aqueous extracts except for the extract of 10 d-old shoots at higher dosages. When partitioned with ethyl acetate, the germination-promoter(s) in the aqueous extracts remained in the aqueous phase while some inhibitors were extracted with ethyl acetate. In contrast, aqueous shoot extracts added to the incubation media at the same dosage for promotion of seed germination inhibited radicle elongation of M. vaginalis, indicating that the sensitivity of the weed varies between these two growth stages.

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Authors and Affiliations

  1. Weed Science Center, Utsunomiya University, Utsunomiya, 321, Japan

    Shun Kawaguchi, Koichi Yoneyama, Yasutomo Takeuchi, Masaru Ogasawara & Makoto Konnai

  2. Department of Biosciences, Teikyo University, Utsunomiya, 320, Japan

    Takao Yokota

Authors
  1. Shun Kawaguchi
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  2. Koichi Yoneyama
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  3. Takao Yokota
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  4. Yasutomo Takeuchi
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  5. Masaru Ogasawara
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  6. Makoto Konnai
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Kawaguchi, S., Yoneyama, K., Yokota, T. et al. Effects of aqueous extract of rice plants (Oryza sativa L.) on seed germination and radicle elongation of Monochoria vaginalis var. plantaginea. Plant Growth Regulation 23, 183–189 (1997). https://doi.org/10.1023/A:1005986126035

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