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Planta

, Volume 193, Issue 3, pp 455–460 | Cite as

Cellular localization of NADH-dependent glutamate-synthase protein in vascular bundles of unexpanded leaf blades and young grains of rice plants

  • Toshihiko Hayakawa
  • Teiji Nakamura
  • Fuyu Hattori
  • Tadahiko Mae
  • Kunihiko Ojima
  • Tomoyuki Yamaya
Article

Abstract

Tissue and cellular localization of NADH-dependent glutamate synthase (NADH-GOGAT, EC 1.4.1.14) in the unexpanced leaf blades and young grains of rice (Oryza sativa L.) was investigated using tissue-print immunoblot and immunocytological methods with an affinity-purified anti-NADH-GOGAT immunoglobulin G. Tissue-print immunoblots showed that the NADH-GOGAT protein was mostly located in large and small vascular bundles of the unexpanded blades. When the cross-sections (10μ in thickness) prepared from the paraffin-embedded blades were stained with the antibody, the NADH-GOGAT protein was detected in vascular-parenchyma cells and mestome-sheath cells. In developing grains, the NADH-GOGAT protein was detected in both phloem- and xylem-parenchyma cells of dorsal and lateral vascular bundles, and in the nucellar projection, nucellar epidermis, and aleurone cells. On the other hand, ferredoxin (Fd)-dependent GOGAT (EC 1.4.7.1) was located mainly in mesophyll cells of the leaf blade and in chloroplast-containing cross-cells of the pericarp of the grains. The spatial expression of these GOGAT proteins indicates distinct and non-overlapping roles in rice plants. In the leaf blades and young grains, NADH-GOGAT could be involved in the synthesis of glutamate from the glutamine that is transported through the vascular system from roots and senescing tissues.

Key words

Cellular localization NADH-glutamate synthase Nitrogen metabolism Oryza (glutamate synthase) 

Abbreviations

Fd-GOGAT

ferredoxin-dependent glutamate synthase

GS

glutamine synthetase

IgG

immunoglobulin G

NADH-GOGAT

NADH-dependent glutamate synthase

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Copyright information

© Springer-Verlag 1994

Authors and Affiliations

  • Toshihiko Hayakawa
    • 1
  • Teiji Nakamura
    • 2
  • Fuyu Hattori
    • 1
  • Tadahiko Mae
    • 1
  • Kunihiko Ojima
    • 1
  • Tomoyuki Yamaya
    • 1
  1. 1.Department of Applied Biological Chemistry, Faculty of AgricultureTohoku UniversitySendaiJapan
  2. 2.Department of Applied Bio-Sciences, Faculty of AgricultureTohoku UniversitySendaiJapan

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