Activities of the plasma membrane Ca~(2+)-ATP(ase) from tobacco leaf and root were determined and their Characterizations were also compared.The results indicated they were different in many aspects.The activity of leaf plasma membrane Ca~(2+)-ATPase reached the maximum at pH 7.0,the root plasma membrane Ca~(2+)-ATPase reached that at pH 6.0 and showed a high activity in a broader range of pH.The optimum reaction temprature of the leaf plasma membrane Ca~(2+)-ATPase was 45℃and that of the root plasma membra...
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