Various sensitivity to sulphur bisulphate of spores sporelings and mi- croregenerants of the mosses Ceratodon purpureus, Pohlia nutans, Tortula modica growing on the substrates after sulphur extraction has been determined. Resistivity of the mosses C. purpureus, T. modica, Funaria hygrometrica, Physcomitrella patens to HgCl as a factor capable to initiate epigenetic adaptation on dosed stressor concentrations has been analysed. Spores appeared to be more sensitive to HgCl and more resistant to NaHSO than microregenerants, which confirms different reaction of mosses to toxic influence of the elements, but under natural conditions it represents the adaptive strategy for choosing the ways of reproduction. High ability of spores and regenerants (from 5 % to 30 %) for survival under HgCl and NaH- SO distress demonstrates the possibility of epigenetic adaptation under natural conditions. Methylation inhibitor of DNA 5-azacytidine stimulated spores sprouting, differentiation of gametophore buds, development of short turfs of T. modica, and selectively enhanced moss resistivity to mercury. As a result, morpho-physiological properties acquired after selective action of mercury and 5-azacytidine appeared to be common and were inherited in three vegetative generations of T. modica. It confirms selection possibility of induced epigenotypes ‘memorizing’ the stressor influence under extreme natural conditions. It may also be supposed that moss reproduction is controlled by the change of methylated DNA state.

Keywords: spores, regeneration, methylation, epigenetic adaptation

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