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Cations ameliorate bisulfite effects in terricolous mosses

In the calcifuge moss Pleurozium schreberi, Fe3+ from underlying soil ameliorates inhibitory effects of bisulfite (dissolved SO2) on photosynthesis, probably by passive oxidation. Ca2+ ions have no protective effect. However, Bharali and Bates (pp. 337-343) show that adsorbed Ca2+ strongly ameliorates bisulfite inhibition of photosynthesis in Rhytidiadelphus triquetrus, a moss restricted to calcareous soils in polluted regions.





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