The changes in metabolic utilization of galactose in tobacco mosaic virus infected tobacco plants treated with 2,4-dichlorophenoxyacetic acid

The study deals with the changes in metabolic processes of galactose breakdown in tobacco mosaic virus infected tobacco tissues treated with a 1.0 × 10⁻⁴ M solution of 2,4-D (2,4-dichlorophenoxyacetic acid). At the time of maximum virus reproduction the plants infected exhibited a considerable increase in galactokinase and galactose-1-phosphate uridyltransferase activities. The activity of both galactose metabolizing enzyme systems investigated was not affected markedly by 2,4-D, but its increase was induced preferentially by virus biosynthesis.