Content of auxin-inhibitor-and gibberellin-like substances in humic acids |
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Authors: | E Casenave de Sanfilippo J A Argüello G Abdala G A Orioli |
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Institution: | (1) Laboratorio de Fisiologia y Ecologia Vegetal Cerzos y Departamento de Agronomia, Universidad Nacional del Sur, 8000 Bahia Bianca, Argentina;(2) Present address: Laboratorio de Fisiologia Vegetal F. A. A., Universidad Nacional de Santiago del Estero, Belgrano1912, 4200 Santiago del Estero, Argentina |
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Abstract: | The content of auxin-, inhibitors-and gibberellin-like substances in freeze-dried humic acids was studied. The results indicate
the existence of growth-promoting substances in humic acids, possibly corresponding to IAA or its precursors. Inhibitory activity
is more marked during germination than during the growth process. The inhibitory effect caused by high concentration of humic
acids could be due to an auxin-like action rather than an input per se of growth inhibitors. A significant amount of both
free and conjugated gibberellin-like substances were observed. |
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Keywords: | |
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