The effects on root geotropism of 2‐carboxyphenyl derivatives of various five‐ and six‐membered heterocyclic compounds have been assessed. In an assay involving cress seedlings, appropriately substituted derivatives of isoxazole, 1,3,4‐ and 1,2,4‐ oxadiazoles, 1,3,4‐thiadiazole, 1,2,4‐triazole, thiazoie, pyridine, pyrimidine and pyridazine were highly effective in eliminating the geotropic response.
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Harris et al. (1980) studied this question.
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