Abstract
The effect of D 2O on the permeability of beet ( Beta vulgaris L.) membranes to betacyanin was investigated. The rate of pigment efflux was significantly greater in a 99+%D 2O environment than in H 2O. The enhanced rate of leakage, evident at all D 2O concentrations greater than approximately 65% could be delayed by exogenously supplied Ca 2+. Cycloheximide and puromycin had similar effects on pigment efflux. It is suggested, therefore, that the disruption of the beet root membranes in D 2O was caused by at least a partial inhibition of protein synthesis in the D 2O incubated tissue.
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