WATER RELATIONS AND SO₂ RESISTANCE OF MOSSES

抄録

  The analysis of bryophyte air pollution resistance requires study of both their air pollution uptake capacities and their ability to resist biochemical damage from absorbed pollutants. Both the uptake rates and the effects of air pollutants on the metabolism of mosses are related to the gametophyte hydration state. As bryophytes desiccate, their capacity to absorb pollutants decreases as does their initial photosynthetic sensitivity to pollution. Finally, in the air dried state, the air pollution resistance of mosses is highest because their absorption capacity is lowest and they are metabolically inert. SO₂ reduces photosynthesis during desiccation and this effect is conserved when plants are rehydrated. The responses of mosses to air pollutants are compared to responses of vascular plants and lichens.