Abstract
Few-celled haploid gametophytes of Anemia phyllitidis and gibberellic acid, which specifically imitates the activity of the natural antheridiogens were used to create the model of three-zonal structure of a fern gametophyte to study the cytomorphological background of male sex expression. Experiments showed that expression of male sex induced by gibberellin A 3 was preceded by (1) an increase in profile area of nuclei in gametophyte cells, (2) increase in the number of S phase cells, (3) transverse expansion of antheridial mother cells and was simultaneous with (4) proportional enlargement of cells from the apical zone of gametophyte.
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