Abstract
AbstractLiberation of HCN from cyanogenic plant tissue depends on cyanogen content (HCN‐potential), cyanogen splitting enzymes, cyanohydrin cleaving activity (hydroxynitrile lyase) and nonenzymatic cyanide detoxifying compounds. The maximal amount of HCN potentially set free is governed by the total cyanogen content, whereas the velocity of HCN liberation depends on enzymatic activities (β‐glucosidase [β‐G], hydroxynitrile lyase [HN]). Plants revealing a high HCN‐potential and a high β‐glucosidase activity generally are susceptible to infection with Microcyclus ulei. Based on the data of HCN‐p and β‐G activity of different Hevea species a proposal for future screening work in Hevea resistance selection is given.
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