Abstract
Previous studies showed that 2-ethyl-3-methoxycarbonyl-1-(p-tolylcarbamoyl) isourea acts as a potent GA3-synergist in stimulating shoot growth of rice seedlings. Studies with several structurally related compounds show that the alkoxycarbonylcarbamoyl-isourea or -isothiourea skeleton is required for biological activity. Any chemical deletion from this skeleton causes complete loss of activity. From present and previous data it seems that alkoxycarbonylcarbamoyl-isourea or -isothiourea is converted by intramolecular cyclization in the rice seedlings into the corresponding triazinone that serves as the active form.
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Part 9 in the series “Plant Growth-regulating Activities of Isourea Derivatives and Related Compounds”; for Part 8 seeReferences, Ogawa et al. (1980b)
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Ogawa, M., Matsui, T. & Tobitsuka, J. Synthetic gibberellin synergists in elongation of shoot growth ofOryza sativa L.. J Plant Growth Regul 2, 129–135 (1983). https://doi.org/10.1007/BF02042241
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DOI: https://doi.org/10.1007/BF02042241