Dormancy breaking of G-0 ‘Granola’ potato minitubers as affected by GA₃ and size

The potato is a high value crop in the Philippines.
The production of minitubers from stem cuttings is one method of increasing the potato propagule supply.
However, minitubers exhibit a longer dormancy period than potato tubers.
This study evaluated the dormancy breakage and sprouting of small (3 to 8 g) and medium (9 to 15 g) G-0 ‘Granola’ potato minitubers applied with various GA₃ concentrations (1, 5, 10, and 25 mg L^‑1) with 0 mg L^‑1 GA₃ (untreated) and 0 mg L^‑1 GA₃ (water-treated) as control treatments.
G-0 potato minitubers treated with 25 mg L^‑1 GA₃ gave a higher sprouting coefficient, the longest apical sprouts, and the most sprouts per minituber at 16 weeks after treatment (WAT). Relative to the control treatments, the 25 mg L^‑1 GA₃ treatment also exhibited a shorter dormancy period (106.6 days). Medium minitubers showed a higher sprouting percentage (84.83%) with longer and more sprouts per minituber at 16 WAT and a shorter dormancy period than small minitubers.
The use of GA₃ in medium minitubers resulted in faster dormancy termination as well as enhanced sprout development.

V Asia Symposium on Quality Management in Postharvest Systems

M.A.J. Urquiola, E.R.V. Bayogan, A.G.D. Delima, R.G. Abad

dormancy period, gibberellic acid, G-0 potato minitubers, minituber size

https://doi.org/10.17660/ActaHortic.2022.1336.38