Summary
The downward lateral transport of at least one inhibitor produced in or released by the cap of a maize root partly explains differences in growth of the upper and lower sides of roots placed in the horizontal position.
The relative activity or level of such a regulator increases with the increase in root length.
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Pilet, PE. Growth inhibitor from the root cap of Zea mays . Planta 111, 275–278 (1973). https://doi.org/10.1007/BF00385112
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DOI: https://doi.org/10.1007/BF00385112