[Effect of changes in gravity on the quantity and localization of fibrillarin in the nucleolus of cress root meristem].

For the first time, in altered gravity, with antifibrillarin antibodies and immunogold microscopy fibrillarin that is one of the most important proteins of rRNA processing was localized. The quantitative study of the density of gold particles in the nuclelous, under clinorotation both the transition zone FC-DFC and the dense fibrillar component were less labeled as compared to the control. Obtained data allow us to suppose the lowering of the rRNA processing level in the nucleoli under the influence of altered gravity.