Functional Transport of Nitrogen Compounds in the Sporophyte of Laminaria japonica

DOI Web Site Web Site 被引用文献1件 参考文献36件
  • Mizuta Hiroyuki
    Laboratory of Marine Breeding Sciences, Faculty of Fisheries, Kokkaido University
  • Maita Yoshiaki
    Laboratoy of Chemical Oceanography, Faculty of Fisheries, Hokkaido University
  • Yanada Mitsuru
    Laboratoy of Chemical Oceanography, Faculty of Fisheries, Hokkaido University
  • Hashimoto Shinji
    Laboratoy of Chemical Oceanography, Faculty of Fisheries, Hokkaido University

書誌事項

タイトル別名
  • Functional Transport of Nitrogen Compounds in the Sporophyte of <i>Laminaria japonica</i>
  • Functional Transport of Nitrogen Compou

この論文をさがす

抄録

The nitrogen transportation within the thallus of Laminaria japonica Areschoug was investigated both in laboratory and field experiments. In the laboratory, it was observed by using 15N as a tracer that the thallus allocated labelled soluble organic N to the younger basal tissues and labelled ammonium to the mature apical tissues. In addition, the younger basal tissues had a higher NH4+ uptake ratethanmature apical tissues, and the assimilation of NH4+ was more active in thematuretissues.These results suggest that this transportation is based on two sourcesink relationships.One is the transport of inorganic N from basal to mature tissues for assimilation. Another is the transport of soluble organic N assimilated in mature tissues to basal meristematic tissues for growth.<br> To understand the transportation in the natural environment, tissue removal experiments wereconducted during N-rich (Jan-Feb) and N-poor (Apr-May) periods. During N-rich periods, the removal of the apical parts led to a decrease of total soluble N content and an increase ofinorganic N content in basal tissues and was associated with reduced growth rate. On the other hand, the removal of the basal part resulted in the reverse phenomenon to the removal of the apical part. Thus, the defined transport mechanism is closely connected with the younger basal tissues and mature apical tissues. It is suggested that the mechanism plays an important rolein the growth and survival of the blade in the natural environment. The characteristics of the N transport mechanism are also discussed.

収録刊行物

被引用文献 (1)*注記

もっと見る

参考文献 (36)*注記

もっと見る

キーワード

詳細情報 詳細情報について

問題の指摘

ページトップへ