Effect of hypoxia on the antioxidative enzymes in aerobically grown rice (Oryza sativa) seedlings

Takashi Ushimaru, Sumio Kanematsu, Mineo Shibasaka, Hideo Tsuji

    Research output: Contribution to journalArticlepeer-review

    47 Citations (Scopus)

    Abstract

    The development of the antioxidative system is repressed in rice (Oryza sativa L. cv. Yamabiko) seedlings germinated under water, but the system is synthesized within 24 h after exposure of the seedlings to air. In order to see whether this regulation of the antioxidative system is reversible, the changes were investigated after submergence of aerobically grown seedlings under water. Low survivability, no morphological change and a slight increase in activity of alcohol dehydrogenase (ADH; EC 1.1.1.1) were observed 24 h after the submergence. Activities of some antioxidative enzymes were decreased, but they were still higher than those in seedlings germinated under water. Superoxide dismutase (SOD; EC 1.15.1.1) in mitochondria, in addition to cytosolic forms of SOD, showed no significant changes, whereas plastidic SOD decreased drastically, which reflected the changes in the development of the corresponding organelles. Thus, the regulation of the antioxidative system was, in part, reversible. In contrast, catalase (EC 1.11.1.6) activity alone was increased by the shift from air to submergence.

    Original languageEnglish
    Pages (from-to)181-187
    Number of pages7
    JournalPhysiologia Plantarum
    Volume107
    Issue number2
    DOIs
    Publication statusPublished - Oct 1999

    ASJC Scopus subject areas

    • Physiology
    • Genetics
    • Plant Science
    • Cell Biology

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