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ISHS Acta Horticulturae 162: Symposium on CO2 Enrichment

PHOTOSYNTHETIC ADAPTION IN CO2 ENRICHED AIR AND THE EFFECT OF INTERMITTENT CO2 APPLICATION ON GREENHOUSE PLANTS

Author:   Leiv M. Mortensen
DOI:   10.17660/ActaHortic.1984.162.15
Abstract:
Different plant species have been included in the study of the effect of CO2 enrichment on photosynthesis and growth. Short-term measurements (within a few hours) of net photosynthetic rate (PN) on small plant stands have been carried out in a semi-closed cuvette system. Long-term growth experiments (several weeks) have been carried out in growth chambers or growth rooms. Net photosynthetic rates have been found to be increased 50–100 % by rising the CO2 concentration from 330 to 1000–1500 vpm in short-term experiments. The mean relative growth rates (RCR) in experiments over several weeks, however, were enhanced only 10–26 %. Experiments with Chrysanthemum x morifolium have shown that this discrepancy between short-term and long-term experiments might be explained by a negative adaption of plants to prolonged exposure in CO2 enriched air. Results with Chrysanthemum x morifolium and Saintpaulia ionantha indicate that intermittent CO2 application (1 h with, followed by 1 h without enrichment) may reduce this negative adaption to high CO2 concentrations.

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