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This article in CS

  1. Vol. 17 No. 4, p. 578-582
     
    Received: Oct 23, 1976
    Published: July, 1977


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doi:10.2135/cropsci1977.0011183X001700040024x

Assay of p-Hydroxybenzaldehyde as a Measure of Hydrocyanic Acid Potential in Sorghums1

  1. H. J. Gorz,
  2. W. L. Haag,
  3. J. E. Specht and
  4. F. A. Haskins2

Abstract

Abstract

A method of assessing the hydrocyanic acid potential (HCN-p) of sudangrass [Sorghum sudanense (Piper) Stapf] and sorghum [S. bicolor (L.) Moench] seedlings is described. This procedure is based on the determination of p-hydroxybenzaldehyde (p-HB), which is released upon hydrolysis of dhurrin, the cyanogen normally present in plants of Sorghum species. Extraction and hydrolysis of dhurrin are accomplished by autoclaving young leaf tissue in water. The content of p-HB in the aqueous extract is then determined by spectrophotometric assay in alkaline solution at 330 nm. Uniform samples for the comparison of widely divergent genotypes are obtained by using the first leaf of young, chamber-grown, green seedlings. Relative ranks of a wide variety of sorghum germplasm assayed for HCN content by this technique are in good agreement with those obtained by other methods. The procedure shows promise of providing a rapid and precise tool for conducting genetic and breeding studies with sorghums.

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