EFFECT OF POTASSIUM ON PROLINE ACCUMULATION IN CUCUMBER COTYLEDONS

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Abstract
Summary: Free proline accumulation in excised cucumber cotyledons and in leaves of cowpea seedlings increased after treatment of the plants with potassium chloride. In excised cucumber cotyledons there was less K‐induced proline accumulation in the presence of benzyladenine (BA) and free proline disappeared when cotyledons were transferred to BA. Cycloheximide increased the proline content in the tissue when present alone or in combination with BA and/or K. Under simulated water stress, the proline content increased but the increase was greater in cotyledons also treated with KCl. In cowpea seedlings, reduction in relative water content (RWC) under stress was much less in seedlings treated with additional amounts of KCl, and their praline content was also high. There appears to be thus a relationship between K content, praline accumulation and water content of the leaves.

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