Abstract
In three experiments with cvs Diamant (short dormancy) and Désirée (long dormancy), the effect of a haulm application of gibberellic acid (GA) on the dormancy of seed potatoes harvested immature was investigated. Several storage temperature regimes were imposed to examine the interaction between GA and storage temperature. The storage regimes included 18 and 28 C continuously, hot pre-treatments of different duration (different periods at 28 C and subsequently 18 C) and a cold pre-treatment (20 days at 2 C and subsequently 18 C).
A foliar spray of 375–750 g GA/ha 3–6 days before haulm killing shortened dormancy, and minimally induced sprouting before harvest. The magnitude of the GA effect depended on the cultivar and storage temperature regime. Compared to untreated tubers stored at 18 C, dormancy was shortened by about 40 days by a GA application and storage at 18 C (Diamant) or by about 90 days by a GA application and storage at 28 C (Désirée).
Compendio
Se investigó, en tres experimentos, con los cultivares Diamant (de reposo corto) y Désirée (de reposo prolongado), el efecto de la aplicación de ácido giberélico (GA) al follaje sobre el reposo de tubérculos-semillas de papa cosechados inmaduros. Se aplicaron varios regimenes de temperatura en el almacenamiento para observar la interaccion entre el GA y la temperatura en el almacenamiento. Los regimenes en el almacenamiento incluyeron 18 y 28 C aplicados continuamente, pretratamientos de calor de diferente duratión (diferentes periodos a 28 C y posteriormente a 18 C) y un tratamiento frío (20 días a 2 C y posteriormente a 18 C).
Una aplicación foliar de 375–750 g GA/ha, 3–6 días antes de la eliminatión del follaje, acortó el reposo, e indujo el brotamiento, en forma minima, antes de la cosecha. La magnitud del efecto del GA dependió del cultivar y del régimen de temperatura en el almacenamiento. En comparación con los tubérculos que no recibieron tratamiento, almacenados a 18 C, el reposo se redujo en 40 días con una aplicación de GA y un almacenamiento a 18 C (Diamant), o en 90 días con una aplicación de GA y almacenamiento a 28 C (Désirée).
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van Ittersum, M.K., Scholte, K. Shortening dormancy of seed potatoes by a haulm application of gibberellic acid and storage temperature regimes. American Potato Journal 70, 7–19 (1993). https://doi.org/10.1007/BF02848643
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DOI: https://doi.org/10.1007/BF02848643