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Phosphorus requirement of the sporophyte of Laminaria japonica (Phaeophyceae)
Mizuta, H.; Ogawa, S.; Yasui, H. (2003). Phosphorus requirement of the sporophyte of Laminaria japonica (Phaeophyceae). Aquat. Bot. 76(2): 117-126.
In: Aquatic Botany. Elsevier Science: Tokyo; Oxford; New York; London; Amsterdam. ISSN 0304-3770, more
Peer reviewed article  

Available in  Authors 

    Kelps; Nutritional requirements; Phosphorus; Plant nutrition; Sporophytes; Uptake; Laminaria japonica Areschoug, 1851 [WoRMS]; Marine
Author keywords
    critical content; Laminaria japonica; nucleic acids; phosphorus; uptake

Authors  Top 
  • Mizuta, H.
  • Ogawa, S.
  • Yasui, H.

    The relationship between phosphorus uptake and internal phosphorus status was studied on the kelp species, Laminaria japonica Areshoug. Elongation of the cultivated sporophyte ceased after June when phosphorus content was less than 1.3 μg P (g DW)-1, indicating that this is the critical phosphorus content required for growth. The uptake rates of inorganic phosphorus, organic phosphorus, and extracellular alkaline phosphatase rapidly increased when the phosphorus content decreased to the critical level. These results suggest that phosphorus acquisition by the sporophyte is closely linked to the internal phosphorus level. Moreover, nucleic acid content correlated to the phosphorus content when the level of phosphorus was greater than the critical value, suggesting that the critical phosphorus content is a good indicator of phosphorus requirement and utilization within the plant.

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