Preprophase Inhibition of Mitosis in Root Meristems

摘要: SUMMARYA study has been carried out on both growth and mitoses in roots of onion bulbs germinated directly different concentrations various chemicals tap water.Typical C-mitotic poisons (Tiogamma colchicine were tested) do not interfer with neither (all root primordia can express all their inherent elongation ability = 11–17 mm.) nor mitosis initiation; degree course polyploidization being quite similar to those occurring growing roots.Preprophase poisons, the contrary, allow initiation only at threshold concentrations, typical for each chemical. At value preprophase inhibition mitosis, is not—or very slightly—influenced can, rarely, occur even recovering from a week treatment solution.Mitosis delay induced by comparable that following irradiation: prophase prolongation seems be common action X-rays poisons.I...