|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|
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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