Nitrogen Recycling Mechanism within the Thallus of Laminaria japonica(Phaeophyceae) under the Nitrogen Limitation

• Mizuta Hiroyuki

  Laboratory of Marine Botany, Faculty of Fisheries, Hokkaido University

• Maita Yoshiaki

  Division of Marine Biochemical Science, Research Institute of North Pacific Fisheries, Faculty of Fisheries, Hokkaido University

• Kuwada Kousaku

  Division of Marine Biochemical Science, Research Institute of North Pacific Fisheries, Faculty of Fisheries, Hokkaido University

書誌事項

タイトル別名

• Nitrogen Recycling Mechanism within the Thallus of <i>Laminaria japonica</i> (Phaeophyceae) under the Nitrogen Limitation
• Nitrogen Recycling Mechanism within the

抄録

The nitrogen status in the thallus of Laminaria japonica Areschoug under nitrogen limitation is divided to two phases, slight and serious N-deficient phases. This is done by judging from the quantitative storage levels of the soluble nitrogen in the tissues. The slight N-deficient phase is represented by the consumption of soluble nitrogen compounds in the storage pools. After the exhaustion of the nitrogen storage pools, the nitrogen status changes from a slight N-deficient phase to a serious N-deficient phase. Then catabolism was progressed and NH⁺₄ was accumulated as a catabolite under the serious N-deficient phase. The treatment of L-methionine-DL-sulfoxisimine, an inhibitor of glutamine synthetase (GS), resulted in a considerably higher NH⁺₄ accumulation within the tissue segments rather than non-treatment. This fact suggests the presence of a nitrogen recycling mechanism that the NH' produced from catabolic processes is actively re-assimilated by GS in the apical tissues. In the natural environment, the blade length was negatively correlated to an NH⁺₄ content in apical tissues along the thallus during the serious N-deficient phase. This suggests that the nitrogen recycling mechanism may be an important role for survival of the seaweed in the period of N-deficiency in seawater. In addition, this mechanism may be closely related to the erosion of apical tissues that is called “Suegare” in Japan. Furthermore, the inducing mechanism of “Suegare” is also discussed considering with the nitrogen recycling mechanism in the thallus under the serious N-deficiency.

収録刊行物

• Ｆｉｓｈｅｒｉｅｓ　ｓｃｉｅｎｃｅ

  Ｆｉｓｈｅｒｉｅｓ　ｓｃｉｅｎｃｅ 60 (6), 763-767, 1994

  公益社団法人 日本水産学会

キーワード

• Laminaria
• nitrogen
• assimilation
• catabolism
• senescence

詳細情報

• CRID: 1390282679405841536
• NII論文ID: 130003902618
• NII論文ID: 40005348112
• NII書誌ID: AA10993718
• DOI: 10.2331/fishsci.60.763
• NDL書誌ID: 3642804
• ISSN: 09199268
• Web Site: https://ndlsearch.ndl.go.jp/books/R000000004-I3642804
• Web Site: https://www.jstage.jst.go.jp/article/fishsci1994/60/6/60_6_763/_pdf
• 本文言語コード: en
• データソース種別:
  • JaLC
  • NDL
  • Crossref
  • CiNii Articles
• 抄録ライセンスフラグ: 使用不可