Abstract
SUMMARY Salicornia pacifica stem tissues were treated with ATP, Ca(NO3)2 and Pb(NO3)2 to localize ATPase. ATPase activity was present along the plasma membranes and in the cytoplasm of the cortical palisade, inner cortex and vascular cells of young shoots. ATPase was also present in the plasma membranes of tracheids which are present in the palisade region. Ouabain did not inhibit ATPase, but NaF‐, crown ethers, and N.N′‐dicyclohexyl carbodiimide (DCCD) did so in vitro. Only DCCD significantly inhibited (82 %) ATPase in tissues processed for electron microscopy. Energy dispersive microanalysis was used to verify that the precipitates were Pb phosphate.
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