Morphophysiological and agronomic characteristics of potato 'Markies' treated with gibberellin inhibitors

F.F. Araújo, T.P. Silva, M.N.S. Santos, L.C. Costa, F.L. Finger
Potato is one of the main staple food species on the planet, like corn, rice and wheat. However, under summer Brazilian climate conditions, the plants have excessive growth of the stems and foliar mass resulting in auto shading, with consequent increase of diseases, reducing yield and dry matter content of tubers. The objective of this work was to evaluate the effect of growth regulators on plant height, number of stems and tubers, carbohydrates and production of the French fry processing 'Markies', grown under summer conditions at the state of Minas Gerais, Brazil. Thirty-five days after planting, paclobutrazol (PBZ) at 0.125 and 0.250 L ha‑1 and trinexapac-ethyl (TE) at 1.0 and 2.0 L ha‑1 were sprayed until leaf run off. PBZ at the highest dose was the most efficient treatment reducing the plant height by 20% compared to control plants. The number of stems per plant was not altered by any treatment. The treatments with the growth regulators were not effective in increasing the dry matter content of the tubers. Tubers from control and plants treated with TE 1.0 L ha‑1 showed higher starch content at harvest of mature tubers.
Araújo, F.F., Silva, T.P., Santos, M.N.S., Costa, L.C. and Finger, F.L. (2019). Morphophysiological and agronomic characteristics of potato 'Markies' treated with gibberellin inhibitors. Acta Hortic. 1251, 153-158
DOI: 10.17660/ActaHortic.2019.1251.22
Solanum tuberosum L., carbohydrates, growth regulators, paclobutrazol, trinexapac-ethyl

Acta Horticulturae