Plant and Soil

, Volume 72, Issue 1, pp 57–71 | Cite as

Nature of oxidizing power of rice roots

  • T. Ando
  • S. Yoshida
  • I. Nishiyama


The oxidizing power of rice roots comprises two components,i. e., oxygen release and enzymatic oxidation as measured by α-naphthylamine oxidation. Microscopic examination of roots shows a columnar arrangement of cells having structural intercellular spaces that may serve as air passage pipes in the tip region of the root. Both oxygen release and α-naphthylamine oxidation were studied as function of atmospheric oxygen concentration, light, temperature of root environment, respiratory inhibitors, and nutritional status of the plant. The results led to the concept that α-naphthylamine oxidation is a part of the respiration, and that the oxygen which is not consumed by respiration is diffused into the surrounding environment. Both processes are governed by molecular oxygen supply from shoots. At 25°C, the oxygen release of 3-week-old seedlings of IR36 was about 9 times greater than the amount of oxygen needed to account for α-naphthylamine oxidation rate.

Key words

Air passage system Enzymatic oxidation Oxidizing power Oxygen release Rice 


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Copyright information

© Martinus Nijhoff/Dr W. Junk Publishers 1983

Authors and Affiliations

  • T. Ando
    • 1
  • S. Yoshida
    • 1
  • I. Nishiyama
    • 1
  1. 1.Department of Plant PhysiologyInternational Rice Research InstituteLos Baños, LagunaPhilippines

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