High content of cytosolic glutamine synthetase does not accompany a high activity of the enzyme in rice (Oryza sativa) leaves of indica cultivars

Mitsuhiro Obara, Tadashi Sato, Tomoyuki Yamaya

    Research output: Contribution to journalArticle

    17 Citations (Scopus)

    Abstract

    Reproductive stages of 5 japonica, 9 indica, and 2 javanica cultivars of rice (Oryza sativa L.) were provided to compare the contents of protein for cytosolic glutamine synthetase (GS1; EC 6.3.1.2) in the lowest position of the attached leaf blade (position 6 from the primary leaf) and those for NADH-glutamate synthase (NADH-GOGAT; EC 1.4.1.14)in non-green portion of the expanding 10th leaf blade. Some of the indica cultivars, including Kasalath, contained GS1 protein twice as high as other japonica and javanica cultivars based on total leaf nitrogen. Most of the indica cultivars, on the other hand, contained less NADH-GOGAT protein than japonica and javanica cultivars. Immunostaining proved that GS1 protein was located in vascular tissues of the leaf blades of Kasalath, which was identical to our previous results with a japonica cultivar [Sakurai et al. (1996) Planta 200: 306-311]. Although relative contents of GS1 protein in the leaf blade of Kasalath increased as a function of leaf age, GS1 activity remained relatively constant. In addition, Kasalath showed lower activity than other japonica and javanica cultivars, especially during leaf expansion. GS1 activity, based on GS1 protein amount, changed during the life span of the leaf blade and we thus assume that GS1 activity was modulated post-translationally in rice leaves.

    Original languageEnglish
    Pages (from-to)11-18
    Number of pages8
    JournalPhysiologia Plantarum
    Volume108
    Issue number1
    DOIs
    Publication statusPublished - 2000 Jan

    ASJC Scopus subject areas

    • Physiology
    • Genetics
    • Plant Science
    • Cell Biology

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