The effect of elevated CO2 on the growth of tobacco under high light (16 h), continuous water and nutrient supply was investigated. Biomass production depended strongly on the size of the root bed. Inhibition by a small root bed was higher at 700 than at 360 ppm CO2. Relative growth rates showed a head-start of the high-CO2 plants which gave rise to a persistently higher biomass production. Root-bed size and CO2 concentration were mirrored by the quantitative cytokinin patterns of the various plant parts. Amounts of the cytokinins moving from the root to the shoot were higher in high-CO2 plants.
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