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Rapid cycling of potato tuber generations by overcoming dormancy
- Jansky, Shelley H., Hamernik, Andy
- American journal of potato research 2015 v.92 no.1 pp. 148-152
- cultivars, dormancy, dormancy breaking, field experimentation, gibberellic acid, plant response, planting, postharvest physiology, potatoes, seed tubers, vines
- 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 eleven potato cultivars in two years of field trials. Tubers were wounded and dipped in 0, 10, 100, and 1000 ppm GA. Then, they were planted in the field five 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 1000 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 ppm GA is recommended to overcome tuber dormancy in programs interested in rapid cycling.