Abstract
A flow system was developed to investigate the effects of the gaseous composition on plant growth and development in vitro. This system allows the control of the concentrations of oxygen, carbon dioxide and ethylene inside the tissue culture vessel. In addition, the relative humidity outside the vessels can be controlled to investigate the effects of different transpiration rates on plant performance. Various light conditions can be applied with minimal effects on the gaseous composition and the temperature inside the vessels. The system was used to investigate the effects of various gaseous compositions on plant growth of Solanum tuberosum L. ‘Bintje’. Lowering the relative humidity outside the vessels did not influence plant growth of ‘Bintje’ substantially. Both an increase in CO 2 concentration and a decrease in O 2 concentration significantly affected plant growth. In both treatments leaf area and fresh weight were considerably increased compared with plants grown under ambient conditions. Treatment with ethylene caused epinasty and inhibited growth of ‘Bintje’.
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