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This article in AJ

  1. Vol. 62 No. 3, p. 394-397
    Received: Oct 19, 1969

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Amount and Distribution of Hydrocyanic Acid Potential during the Life Cycle of Plants of Three Sorghum Cultivars1

  1. Robert C. Loyd and
  2. Elmer Gray



Plant parts of ‘Piper’ and ‘Greenleaf’ sudangrass (Sorghum bicolor var. sudanese (L.) Moench.), and ‘Suhi-1’, a sorghum (Sorghum bicolor (L.) Moench.) ✕ sudangrass hybrid, were assayed tor hydrocyanic acid potential (HCN-p) at intervals during their life cycle.

Concentrations (ppm) of HCN-p in aboveground plant parts were generally highest in Suhi-1, intermediate in Greenleaf, and lowest in Piper. The cultivars did not differ significantly for HCN-p in roots. The highest concentrations of HCN-p for each cultivar occurred in the leaves 1 week after emergence. Dry mature seed contained little or no HCN-p. Relative rankings of leaves, stems, and roots for HCN-p varied during the life cycle for each cultivar. Concentrations of HCN-p of tillers, leaves, stems, heads, and roots generally decreased as maturity advanced. Correlation coefficients for concentrations of HCN-p and total dry weight per plant were negative and significant for each cultivar.

Total HCN-p (µg/plant) during the life cycles was greatest in Suhi-1, intermediate in Greenleaf, and lowest for Piper. Correlation coefficients for total HCN-p and dry weight per plant were positive but not significant for any cultivar.

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