Abstract
Summary Intact 12 day old Pennisetum typhoides plants were grown on iso-osmotic solutions of polyethylene glycol or a variety of inorganic salts for 24 h. Plants growing on KCl-solutions accumulated much more proline than plants growing on solutions of CaCl 2 , NaCl, polyethylene glycol (PEG) or MgCl 2 . Interestingly, together with the greatly increased proline concentration after KCl-treatment the proline oxidation is inhibited by KCl. In contrast to this result, the activity of the proline dehydrogenase (responsible for proline oxidation) after treatment with the other salts or PEG is as high or higher than the control. The other enzymes tested (alanine aminotransferase, aspartate aminotransferase, glutamate dehydrogenase) are slightly activated by low concentrations of all the salts and PEG. This is not the case for the oxidative desamination catalysed by glutamate dehydrogenase, the activity of which is inhibited by low concentrations of KCl and PEG.
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