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Journal of Plant Research

, Volume 115, Issue 1, pp 0023–0027 | Cite as

Growth promotion and an increase in cell wall extensibility by silicon in rice and some other Poaceae seedlings

  • M. T. Hossain
  • R. Mori
  • K. Soga
  • K. Wakabayashi
  • S. Kamisaka
  • S. Fujii
  • R. Yamamoto
  • T. Hoson
ORIGINAL ARTICLE

Abstract

The effect of silicon on organ growth and its mechanisms of action were studied in rice (Oryza sativa L. cv. Koshihikari), oat (Avena sativa L. cv. Victory), and wheat (Triticum aestivum L. cv. Daichino-Minori) seedlings grown in the dark. Applying silicon in the form of silicic acid to these seedlings via culture solution resulted in growth promotion of third (rice) or second (oat and wheat) leaves. The optimal concentration of silicon was 5–10 mM. No growth promotion was observed in early organs, such as coleoptiles or first leaves. In silicon-treated rice third leaves, the epidermal cell length increased, especially in the basal regions, without any effect on the number of cells, showing that silicon promoted cell elongation but not cell division. Silicon also increased the cell wall extensibility significantly in the basal regions of rice third leaves. These results indicate that silicon stimulates growth of rice and some other Poaceae leaves by increasing cell wall extensibility.

Key words Avena sativa Cell wall extensibility Growth promotion Oryza sativa Silicon Triticum aestivum 

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Copyright information

© The Botanical Society of Japan and Springer-Verlag Tokyo 2002

Authors and Affiliations

  • M. T. Hossain
    • 1
  • R. Mori
    • 1
  • K. Soga
    • 1
  • K. Wakabayashi
    • 1
  • S. Kamisaka
    • 1
  • S. Fujii
    • 2
  • R. Yamamoto
    • 2
  • T. Hoson
    • 1
  1. 1.Department of Biology, Graduate School of Science, Osaka City University, Sugimoto, Sumiyoshi-ku, Osaka 558-8585, Japan Tel./Fax +81-6-6605-2577 e-mail: hoson@sci.osaka-cu.ac.jpJP
  2. 2.Laboratory of Biology, Tezukayama College, Nara, JapanJP

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