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Crop Science Abstract -

Effects of Frost and Freezing on Hydrocyanic Acid Potential of Sorghum Plants1


This article in CS

  1. Vol. 8 No. 5, p. 526-528
    Received: Oct 16, 1967

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  1. D. W. Wattenbarger,
  2. Elmer Gray,
  3. J. S. Rice and
  4. John H. Reynolds2



The effects of frost and freezing on hydrocyanic acid potential (HCN-p) of plants of ‘Greenleaf’ and ‘Piper’ sudangrass and ‘Suhi-1’, a sorghum ✕ sudangrass hybrid, were studied.

The HCN-p of plants of all plant heights and cultivars decreased during the autumn until frost occurred. Significant increases in HCN-p were measured after most frosts. These increases were most evident from 1 to 6 days after frost. The response of HCN-p to frost was greater in shorter than in taller plants. Plants of Suhi-1 had a greater increase in HCN-p than plants of Greenleaf or Piper. Freezes (−5 C or lower) resulted in death of the plants and caused a decrease in HCN-p which continued until little or none was detected. This decrease in HCN-p was observed for plants of all heights and cultivars.

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