Distribution of two isoforms of glutamine synthetase in bundle sheath and mesophyll cells of corn leaves

Tomoyuki Yamaya, Ann Oaks

    Research output: Contribution to journalArticlepeer-review

    26 Citations (Scopus)

    Abstract

    Localization of two isoforms of glutamine synthetase (GS; EC 6.3.1.2) was investigated in different cell types, mesophyll cells and bundle sheath cells, of corn (Zea mays L. var. W64A × W182E) leaves by using ion exchange chrotnatography. In whole leaf extracts, relative activities of GS1 (cytosolic GS) and GS2 (chloroplastic GS) were almost equal. Purified mesophyll protoplasts and bundle sheath strands also showed similar proportions of GS1 and GS2. Methionine sulfoximine (1 mM) enhanced the accumulation of ammonia when mesophyll protoplasts were incubated with nitrite or when bundle sheath strands were incubated with glycine. This clearly indicates a spatial separation of metabolism of NH+4 derived from photorespiration and from reduction of NOJ.

    Original languageEnglish
    Pages (from-to)23-28
    Number of pages6
    JournalPhysiologia Plantarum
    Volume72
    Issue number1
    DOIs
    Publication statusPublished - 1988 Jan

    Keywords

    • Bundle sheath cells
    • Zea mays
    • corn leaf
    • distribution
    • glutamine synthetase
    • isoenzymes
    • mesophyll cells

    ASJC Scopus subject areas

    • Physiology
    • Genetics
    • Plant Science
    • Cell Biology

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