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Rapid Cycling of Potato Tuber Generations by Overcoming Dormancy

Abstract

Dormancy hinders progress in attempts to fast track potato tuber generations. In this study, we evaluated the ability of gibberellic acid (GA) to overcome dormancy in freshly harvested tubers of 11 potato cultivars in 2 years of field trials. Tubers were wounded and dipped in 0, 10, 100, and 1,000 ppm GA. Then they were planted in the field 5 days later. Vine length and stem number were measured throughout the season. Tubers were also harvested and weighed. Cultivars varied in their response to GA treatment. However, for all cultivars, wounding followed by treatment with 10 or 100 ppm effectively overcame dormancy. The 1,000 ppm treatment produced excessive vine growth and lower yield compared to the lower concentrations. Consequently, wounding of freshly harvested tubers, followed by a dip in 10 or 100 ppm GA is recommended to overcome tuber dormancy in programs interested in rapid cycling.

Resumen

La dormancia obstaculiza el progreso en los intentos de acelerar la obtención de generaciones de tubérculos. En este estudio, evaluamos la habilidad del ácido giberelico (GA) para superar la dormancia en tubérculos recién cosechados de once variedades de papa, en dos años de ensayos de campo. Se les hicieron incisiones a los tubérculos y se sumergieron en 0, 10, 100, y 1,000 ppm de GA. Se plantaron en el campo cinco días después. Se midió la longitud y el número de tallos a lo largo del ciclo de cultivo. Los tubérculos también se cosecharon y pesaron. Las variedades tuvieron diferencias en su respuesta a los tratamientos con GA. No obstante, para todas ellas, las incisiones seguidas de tratamientos con 10 o ppm superaron efectivamente la dormancia. El tratamiento con 1,000 ppm produjo excesivo crecimiento del tallo y más bajo rendimiento comparado con las concentraciones más bajas. Consecuentemente, se recomienda hacer las heridas a los tubérculos recién cosechados, seguidas de inmersión en 10 o 100 ppm de GA para superar la dormancia del tubérculo en programas interesados en ciclos rápidos.

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Acknowledgments

The authors appreciate the assistance of Nick Kueler (UW-Madison Dept. Computing and Biometry) with statistical analyses.

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Correspondence to Shelley Jansky.

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Jansky, S., Hamernik, A. Rapid Cycling of Potato Tuber Generations by Overcoming Dormancy. Am. J. Potato Res. 92, 148–152 (2015). https://doi.org/10.1007/s12230-014-9415-7

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Keywords

  • Gibberellic acid
  • Tuber dormancy