Abstract
Coumarin readily stimulates tuberization of cultured axillary shoots obtained from etiolated potato sprouts. Adequate concentrations of coumarin must be continuously present in the medium to effect tuber initiation. High nitrogen, gibberellic acid, abscisic acid, indole acetic acid, or naphthalene acetic acid reduced or inhibited coumarin-induced tuberization. Gibberellic acid and high concentrations of nitrogen in medium inhibited the uptake of coumarin-3-14C by the. axillary shoot. Based on the data of physiological activities by coumarin in other plant species and our data on tuberization, we propose that coumarin may represent in part the unknown inhibitor responsible for tuber initiation with reference to the inhibitor/gibberellic acid ratio theory of tuberization.
Resumen
La aplicación de coumarina estimula la tuberización de brotes axilares obtenidos de brotes etiolados de tubérculos. Coumarina debe estar continuamente presente en el medio de cultivo en concentraciones adecuadas para producir la iniciación de tuberización. Cantidades elevados de nitrógeno, ácido giberélico, ácido absisico, ácido indol-acético y ácido naftalenacético redujeron o inhibieron la tuberización inducida por coumarina. El ácido giberélico y alta concentración de nitrógeno en el medio inhibieron la absorción de coumarina -3-14C por el brote axilar. De acuerdo a los datos de actividad fisiológica de la coumarina en otras especies vegetales y los datos obtenidos en este trabajo en tuberización, los autores sugieron que la coumarina pueda constituir una parte del inhibidor aun desconocido responsable de la iniciación de la tuberización en referenda a la teoría sobre la proporción inhibidor/ácido giberélico en este proceso
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Published with the approval of the Director of the Idaho Agricultural Experiment Station as Research Paper No. 8175
Former Associate Research Professor, Plant Physiology, University of Idaho, Southwest Idaho Research and Extension Center, Parma, Idaho 83660, and former Scientific Aide, Southwest Idaho Research Center, Parma, Idaho 83660
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Stallknecht, G.F., Farnsworth, S. General characteristics of coumarin-induced tuberization of axillary shoots ofSolanum tuberosum L. culturedin vitro . American Potato Journal 59, 17–32 (1982). https://doi.org/10.1007/BF02854880
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DOI: https://doi.org/10.1007/BF02854880