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Iron Uptake and Translocation by Macrocystis pyrifera¹

California Institute of Technology, Kerckhoff Marine Laboratory, 101 Dahlia Avenue, Corona del Mar, California 92625

Parameters of iron uptake have been determined for blade tissue of Macrocystis pyrifera (L.) C. Ag. These include the effects of iron concentration, light, various inhibitors, and blade type. All experiments were conducted in the defined artificial seawater Aquil. Iron uptake is light independent, energy dependent, and dependent on the reduction from Fe³⁺ to Fe²⁺. Iron is concentrated in the sieve tube exudate; exudate analysis revealed the presence of other micronutrients. Iron and other micronutrient translocation is discussed.

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