Changes in the activity of the Golgi apparatus during the cell cycle in antheridial filaments ofChara vulgaris L.

Summary The number of dictyosomes found in one central cell section in antheridial filaments ofChara vulgaris increases proportionally to the cell length during interphase. The activity of Golgi apparatus was expressed by a number of Golgi vesicles surrounding a single dictyosome. These vesicles are most numerous during mitosis and cytokinesis,i.e., prior to and during cell plate formation. In the middle and late S phase the number of Golgi vesicles decreases by about 25%; subsequently, during the early and middle G₂, it increases again. At the end of the G₂ phase, Golgi vesicles are the scarcest.The increase in the number of Golgi vesicles during the G₂ phase coincides with the period of intense cellular elongation, and, thus, it is probably related to the enhanced synthesis of cell wall components.Coated vesicles are most numerous in prophase, metaphase, and early telophase, and during interphase in both late S and G₂ phase. It was found that the number of coated vesicles is proportional to the degree of condensation of nuclear chromatin.This work was supported by the Polish Academy of Sciences within the project 09.7.3.1.4.