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Diurnal changes in the flux of calcium toward meristems and transpiring leaves in tomato and maize plants


Tomato (Lycopersicon esculentum Mill. cv. Moneymaker) and maize (Zea mays L. cv. spec.) plants were supplied with 45Ca-labeled nutrient solutions for a period of 8 or 16 h in the dark, in the light, or in a light-dark régime. Plant parts were analyzed for 45Ca content. The partitioning of 45Ca between mature leaves and meristems was shown to be affected by the presence of light. The transport of 45Ca to meristems was higher in a dark period than in a comparable light period. Experiments with excised tomato shoots yielded similar distribution patterns of 45Ca over leaves and meristems, thus excluding root pressure as the main driving force for the enhanced import of 45Ca into the meristems in the dark. Results are discussed in terms of cation-exchange transport and competition between the various calcium sinks.

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dry material


indole-3-acetic acid


2,3,5-trijodbenzoic acid


cation exchange capacity


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Contribution No. 1693 of the Radiation Protection Programme of the Commission of the European Communities

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van de Geijn, S.C., Smeulders, F. Diurnal changes in the flux of calcium toward meristems and transpiring leaves in tomato and maize plants. Planta 151, 265–271 (1981).

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Key words

  • Calcium
  • Cation exchange
  • Lycopersicon esculentum
  • Rhythm
  • diurnal Transport (calcium)
  • Zea mays