[Effect of hydrostatic pressure on structural organization of the maize root cells].

We analyzed the effect of hydrostatic pressure at 24 MPa level on the growth and organization of corn seedlings cells. At pressure value of 2 MPa, we observed the clarification of the mitochondrial matrix, clusterization of endoplasmic reticulum elements with formation of ergastorplasm sites and the increasing number of small vacuoles in the cytoplasm. We detected the accumulation of vesicles with electron-dense content on the trans side of dictyosomes, which indicates a change in the endomembranous system traffic.

[Dynamics of ultrastructure changes in sheet plate fiber flax with braking transport assimilate by nitrate-anion].

Changes in leaf mesophyll cell ultrastructure under nitrate feeding into the apoplast of common flax (Linum usitatissimum L.) in the form of 50 mM KNO3 solution were studied. In 30 min after the beginning of nitrate feeding through the transpiration water stream, swelling of mitochondrial and microbodies, clarification of their matrices, and curling of dictyosome discs into annular structures were observed.

[Adaptive reactions of mycoplasmas in vitro: "viable but unculturable forms" and nanocells of Acholeplasma laidlawii].

The adaptation of Acholeplasma laidlawii to conditions unfavorable for growth has been found to be accompanied by cell transformation into special morphological structures known as ultramicroforms (nanocells). The ratio of the cells of the two morphological types in the population depended on the growth conditions. Nanocells retained viability for a long time under conditions unfavorable for growth and showed resistance to stressors.

Influence of cytoskeletal agents on the respiratory electron transport pathways in the cells of winter wheat leaves.

The effects of actin and tubulin polymerization inhibitors on the respiratory electron transport pathway activities were investigated using abscisic acid (ABA)- and cold-treated winter wheat seedling leaves. In unstressed control plants, cytochalasin B (15 microm) decreased the capacity of the cytochrome pathway, but stimulated the cyanide-resistant pathway, whereas oryzalin (15 microm) produced the opposite effects. Cold hardening (3 degrees C for 7 days) and ABA treatment 30 microm changed the respiratory pattern in a similar manner to cytochalasin B but to lesser effects.