[Incorporation of 3H-uracil into the RNA of Utricularia stellaris after sterile cultivation with and without sucrose].

Sucrose has been shown to increase the growth of Utricularia stellaris in axenic culture (HARDER and ZEMLIN, 1967). Comparable cultures of Utricularia were incubated for 3 and 7 hours with tritiated uracil, and then nucleic acids were prepared. With sucrose, the incorporation is about 5 times higher than that with the inorganic salt cultures. After chromatographic separation of the nucleic acids on MAK-columns, different peaks of short time labelled RNA with high specific activity were found. These peaks indicate the presence of two low molecular weight RNA components in the inorganic culture. These peaks also have been found in cultures with sucrose, but in these cultures there is another predominant peak of high molecular weight RNA which is eluted from the column after the greater ribosomal RNA component.