Abstract
Tolerance of SO2 with respect to sexual reproduction is reported for populations of L. virginicum from the Copper Basin of Tennessee [USA], a region subjected to SO2 pollution for the past 75 yr. The offspring of plants from inside and outside of the Copper Basin were fumigated with 2130 .mu.g/m3 SO2 for 9 h at high relative humidity in replicated experiments. As a result of SO2 stress, plants from outside the Copper Basin were less fertile than plants from inside the Copper Basin.

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