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This article in JEQ

  1. Vol. 9 No. 3, p. 493-496
    Received: Dec 20, 1979

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The Influence of Relative Humidity on Direct Sulfur Dioxide Damage to Plant Sexual Reproduction1

  1. William H. Murdy and
  2. Harvey L. Ragsdale2



Results of in vivo experiments with Geranium carolinianum L. showed that sulfur dioxide (SO2) damaged sexual reproduction (in terms of decreased seed set) when relative humidity (RH) was 80% or above, but not when RH was 70% or below. Relative humidity alone, if 80% or higher, damaged sexual reproduction; the addition of SO2 increased the damage. A high SO2 dosage of 1.5 ppm/7 hours at 50% RH caused leaf injury, but decreased percent seed set < 5%, whereas a low SO2 dosage of 0.2 ppm/7 hours at 90% RH decreased percent seed set by 32% without visible leaf injury. At an SO2 dosage of 0.4 ppm/7 hours administered during anthesis, percent seed set was virtually identical with the control at 70% RH, 35% below the control at 80% RH, and 68% below the control at 90% RH.

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