Abstract
Electrophysiological processes were investigated in reception organs of photoperiodism in a model short-day plant,Chenopodium rubrum L. (selection 374), within the inductive cycle for flowering. Transorgan (surface) electric potential (Etr) was measured as a potential difference between the first leaf surface and the roots of an intact plant, and between the surface of an excised leaf and the petiole base. The time-course of Etr in intact plants showed irregular, or partially regular, oscillations within both phases of the inductive cycle and under continuous light. The highest amplitudes were during the postinductive light period. Etr in excised leaves behaved practically in the same way as in intact plants. The Etr oscillations were localized in leaves. In general, no electrophysiological changes were found in the reception organs within the inductive cycle which could be correlated with the formation and transport of floral stimulus, or with the attainment of an induced state. The results indirectly support the idea that the floral stimulus is chemical in nature.
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Adamec, L., Krekule, J. Changes in transorgan electric potential inChenopodium rubrum during the course of photoperiodic flower induction. Biol Plant 31, 344–353 (1989). https://doi.org/10.1007/BF02876349
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DOI: https://doi.org/10.1007/BF02876349