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Rough lemon seedlings  [Citrus limon (L)]  were hydroponically-cultured in complete Shive's nutrient solution (+K) or in Shive's nutrient solution with potassium omitted (-K) for a period of eight months. Fresh and dry weight of whole -K plants were reduced 4-fold (P&lt;0.01). Nitrogen metabolism was monitored during this period in young, fully expanded leaves. Results showed that leaves of -K plants accumulated 2.5-fold more NH 3 -NH 4  + than +K plants (P&lt;0.01) and exhibited a concomitant increase in both activity of the  de novo  arginine biosynthetic pathway (2.5-fold) and free-arginine concentration (3.5-fold; P&lt;0.001). Leaf proline content of -K plants increased 1.6-fold (P&lt;0.05), while putrescine content increased 10-fold. Arginine decarboxylase activity was accelerated in -K plants.

750 PB 114 PARALLEL CHANGES IN AMMONIA, ARGININE AND PUTRESCINE CONTENT AND METABOLISM IN POTASSIUM-DEFICIENT CITRUS LIMON(L)