Abstract
Excised phyllodia of Bryophyllum tubiflorum standing in phosphate buffer to which verapamil is added undergo specific alterations in their gaseous exchange reactions as well as in the amount of malate accumulated in the dark period. Inhibition of accumulation of malate increases with increasing concentrations of verapamil. The effects caused by verapamil are reversible. During the dark period plasmalemma under the chloroplasts detaches itself from the cell wall, forming a vacuole-like space between plasmalemma and cell wall which disappears in the following light period. In the presence of verapamil this formation of a vacuole-like structure does not occur.
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