Epigenetically-determined apogamy in aposporous regenerants of the moss Pottia intermedia persists during vegetative propagation, the capacity of apogamy being inherited by individual aposporous protonemal cells. To test Bauer-Lazarenko's proposal that stable apogamy in mosses may be due to some self-replicating cytoplasmic factor, the effects of different metabolic stress treatments on the expression of apogamy have been tested. Chronic metabolic stress caused by long-term growth of autotrophic aposporous protonema on mineral medium with 0.25% of casamino acids and on Murashiga-Skoog (MS) medium with sucrose and phytohormones, as well as by transitory action of high kinetin concentration, have a much stronger influence on the expression of apogamy, than short-term stress treatments with RNase and Pb(2+). Apogamy has been found to be lost stably, after prolonged growth on MS medium containing kinetin and ABA. The proposal that the capacity for apogamy is related to the release of aposporous protonemal cells from a putative factor for apogamy is discussed.
The effect of exogenous hydrogen peroxide on the state of lipid peroxidation and activity of antioxidative enzymes in moss Fontinalis antipyretica Hedw. Chornomors'k. bot. z., vol. 4., №2: 244-250. The effect of exogenous hydrogen peroxide on lipid peroxidation and activity of antioxidative enzymes in shoots of the aquatic moss Fontinalis antipyretica is studied. It was shown that proper concentrations of H 2 O 2 does not lead to accumulation of lipoperoxidation products, but modulate evidently the activity of antioxidant enzymes. Increasing of catalase and peroxidase activity under the influence of 1 and 10 mM H 2 O 2 is revealed. Decreasing of glutathione reductase activity under the influence of Н 2 О 2 is recognized with change of redox-status in the plant cells as possible cause of it.
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