Journal Article

Localization of Glutamine Synthetase Isoforms in Hair Cells of <i>Azolla</i> Leaves

Eiji Uheda, Kazuhiro Maejima and Nobuyuki Shiomi

in Plant and Cell Physiology

Published on behalf of Japanese Society of Plant Physiologists

Volume 45, issue 8, pages 1087-1092
Published in print August 2004 | ISSN: 0032-0781
Published online August 2004 | e-ISSN: 1471-9053 | DOI: http://dx.doi.org/10.1093/pcp/pch112
Localization of Glutamine Synthetase Isoforms in Hair Cells of Azolla Leaves

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  • Biochemistry
  • Molecular and Cell Biology
  • Plant Sciences and Forestry

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Immunoelectron microscopy and a quantitative analysis of immunogold labeling of a glutamine synthetase (GS; EC 6.3.1.2) revealed that, in mesophyll cells of mature leaves of Azolla filiculoides, almost all GS was present in chloroplasts. By contrast, in hair cells, abundant labeling of GS was observed both in chloroplasts and in the cytoplasm. In hair cells of cyanobiont-free plants, the labeling of GS of both chloroplasts and cytoplasm was very weak compared to that of cyanobiont-containing plants. The findings suggest that hair cells play an important role in the assimilation of ammonia released by the cyanobiont.

Keywords: Keywords: Ammonium — Azolla — Cyanobiont — Glutamine synthetase (GS) — Hair cells — Isoforms.; Abbreviation: GS, glutamine synthetase.

Journal Article.  3949 words.  Illustrated.

Subjects: Biochemistry ; Molecular and Cell Biology ; Plant Sciences and Forestry

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