Respiratory Responses to Cations in a Red Alga and Their Relationships to Ion Transport

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Abstract
Two types of salt respiration occur in Porphyra perferata. One is a gross requirement for monovalent cation; the other is specific for K, Rb or Cs. The latter stimulation is transitory. Inhibitor studies indicate that K and Rb stimulate production of phosphate-acceptors leading to increased oxidative phosphorylation and O2 consumption. ATP utilization for Na extrusion may be the K and Rb stimulated reaction involved.