Changes In Peroxidases In The Suspension Culture Of Rubus Fruticosus During Growth

The growth parameters of a cell suspension culture of Rubus fruticosus L. were determined over a culture period including exponential growth, stationary phase and a glucose starvation period at the end of the normal culture cycle. Peroxidase activities were measured in the cytoplasm, in the cell wall, and in the culture medium by the guaiacol assay. There is a relationship between the activity found in the spent medium and the dry matter mass of the cells during the exponential growth. In the three compartments a bimodal repartition of peroxidase activities was observed, with the two peaks at day 4 and day 26, respectively. This suggests that the first peak corresponds to actively dividing cells whereas the second is associated with senescence, or stress due to starvation. Fractionation of the peroxidases from the culture medium revealed the presence of two sets of cationic isoenzymes, with minor amount of anionic peroxidases. 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