Relationship between resumption of rRNA transport into cytoplasm after cold treatment and progression through the cell cycle in root meristem cells

Abstract

Experiments with 3H-uridine incorporation have shown that cold treatment inhibits rRNA transport from nucleoli to the cytoplasm. The rate of rRNA transport during recovery after cold treatment has been investigated in root meristems of Secale cereale, Vicia faba and Allium cepa. Results obtained by use of autoradiographic and cytophotometric methods indicate that in each species nucleoli lose half their radioactivity after the first 2.5–3.0 hr postincubation at 20°C. Concomitantly the number of cells entering the S phase and mitosis increases.