The evolution of HCN increased significantly during the ageing process of slices of potato (Solanum tuberosum L.) tubers in 24 h. Concomitantly, the activity of β-cyanoalanine synthase (CAS)(E.C. 188.8.131.52) was greatly enhanced in the same ageing period. Both the activity of CAS and the evolution of HCN were stimulated by 1-aminocyclopropane-1-carboxylic acid (ACC) and inhibited by salicylic acid (SA). It was also shown that the production of endogenous ethylene in aged slices exhibited a similar increase. Ethylene production was also affected by ACC and SA. A possible relationship between ethylene production, HCN evolution and the stimulation of CAS activity is discussed.
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