Assimilation of ammonium ions and reutilization of nitrogen in rice (Oryza sativa L.)

Mayumi Tabuchi, Tomomi Abiko, Tomoyuki Yamaya

研究成果: ジャーナルへの寄稿記事

186 引用 (Scopus)

抄録

A major source of inorganic nitrogen for rice plants grown in paddy soil is ammonium ions. The ammonium ions are actively taken up by the roots via ammonium transporters and subsequently assimilated into the amide residue of glutamine (Gln) by the reaction of glutamine synthetase (GS) in the roots. The Gln is converted into glutamate (Glu), which is a central amino acid for the synthesis of a number of amino acids, by the reaction of glutamate synthase (GOGAT). Although a small gene family for both GS and GOGAT is present in rice, ammonium-dependent and cell type-specific expression suggest that cytosolic GS1;2 and plastidic NADH-GOGAT1 are responsible for the primary assimilation of ammonium ions in the roots. In the plant top, approximately 80% of the total nitrogen in the panicle is remobilized through the phloem from senescing organs. Since the major form of nitrogen in the phloem sap is Gln, GS in the senescing organs and GOGAT in developing organs are important for nitrogen remobilization and reutilization, respectively. Recent work with a knock-out mutant of rice clearly showed that GS1;1 is responsible for this process. Overexpression studies together with age- and cell type-specific expression strongly suggest that NADH-GOGAT1 is important for the reutilization of transported Gln in developing organs. The overall process of nitrogen utilization within the plant is discussed.

元の言語英語
ページ(範囲)2319-2327
ページ数9
ジャーナルJournal of Experimental Botany
58
発行部数9
DOI
出版物ステータス出版済み - 7 1 2007
外部発表Yes

Fingerprint

ammonium compounds
Ammonium Compounds
assimilation (physiology)
Oryza sativa
Glutamine
Nitrogen
glutamine
Glutamate-Ammonia Ligase
Ions
glutamate-ammonia ligase
rice
nitrogen
Phloem
NAD
phloem
Glutamate Synthase
Amino Acids
amino acids
knockout mutants
paddy soils

All Science Journal Classification (ASJC) codes

  • Physiology
  • Plant Science

これを引用

Assimilation of ammonium ions and reutilization of nitrogen in rice (Oryza sativa L.). / Tabuchi, Mayumi; Abiko, Tomomi; Yamaya, Tomoyuki.

:: Journal of Experimental Botany, 巻 58, 番号 9, 01.07.2007, p. 2319-2327.

研究成果: ジャーナルへの寄稿記事

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abstract = "A major source of inorganic nitrogen for rice plants grown in paddy soil is ammonium ions. The ammonium ions are actively taken up by the roots via ammonium transporters and subsequently assimilated into the amide residue of glutamine (Gln) by the reaction of glutamine synthetase (GS) in the roots. The Gln is converted into glutamate (Glu), which is a central amino acid for the synthesis of a number of amino acids, by the reaction of glutamate synthase (GOGAT). Although a small gene family for both GS and GOGAT is present in rice, ammonium-dependent and cell type-specific expression suggest that cytosolic GS1;2 and plastidic NADH-GOGAT1 are responsible for the primary assimilation of ammonium ions in the roots. In the plant top, approximately 80{\%} of the total nitrogen in the panicle is remobilized through the phloem from senescing organs. Since the major form of nitrogen in the phloem sap is Gln, GS in the senescing organs and GOGAT in developing organs are important for nitrogen remobilization and reutilization, respectively. Recent work with a knock-out mutant of rice clearly showed that GS1;1 is responsible for this process. Overexpression studies together with age- and cell type-specific expression strongly suggest that NADH-GOGAT1 is important for the reutilization of transported Gln in developing organs. The overall process of nitrogen utilization within the plant is discussed.",
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