EFFECT OF BENZIMIDAZOLE ANALOGUES ON STEM RUST AND CHLOROPHYLL METABOLISM

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Abstract
A study of the structural specificity of benzimidazole in relation to its effect on stem rust development and chlorophyll metabolism was made to obtain information which may contribute to our understanding of the nature of rust resistance as well as the physiology of detached leaves of Khapli wheat. Evidence suggests that benzimidazole will lose its activity if any member of the elements in its imidazole ring and probably also in its benzene ring is replaced by a different element, such as carbon, oxygen, nitrogen, or sulphur. Furthermore, compounds in which the methyl, nitro, or other group is introduced into the molecule of benzimidazole are either phytotoxic or antagonistically active to their parent compound.Analogues which were antagonistically active to benzimidazole displayed a similar effect on kinetin. There is strong evidence that benzimidazole and kinetin may play a similar role in maintaining the rust resistance and the normal physiology of detached wheat leaves.