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

Plant parts of ‘Piper’ and ‘Greenleaf’ sudangrass (Sorghum bicolor var. sudanese (L.) Moench.), and ‘Suhi-1’, a sorghum (Sorghum bicolor (L.) Moench.) x 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.

Key Words: HCN • Hydrogen cyanide • Cyanide • Prussic acid • Sorghum

² Former Graduate Student and Associate Professor in Agronomy, University of Tennessee. Presently Graduate Student and Associate Professor in Agriculture, Western Kentucky University.

Received for publication October 19, 1969.

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