Indução de frutificação em abóbora ‘tipo butternut’ por meio da aplicação de citocinina e auxina.

Abstract

The use of growth regulators has been gaining more and more importance in inducing fruiting in cucurbits, and may be an alternative for the producer to improve the quality of the fruits and enhance their productivity. In this context, the objective of this work was to evaluate the effect of the application of cytokinin (CPPU) and auxins (IBA and 2,4-dichlorophenoxyacetic acid) on the induction of fruiting in 'butternut-type' pumpkin. The experiment was developed at the Center for Science and Agri-Food Technology at the Federal University of Campina Grande (CCTA / UFCG), located in the municipality of Pombal, state of Paraíba. The treatments were divided into: 100 mg l-1 of 2,4-dichlorophenoxyacetic (2,4-D) applied via flower on the inside (T1), 100 mg l-1 of 2,4-D applied via flower on the inside external (T2), 3.0 mg l-1 of CPPU via flower on the inside (T3), 3.0 mg l-1 of CPPU via flower on the outside (T4), 50 mg l-1 of 2.4 -D via leaf (T5), 25 mg l-1 of 2,4-D via leaf (T6), 1.5 mg l-1 of CPPU + 50 mg l-1 of 2,4-D via flower on the internal (T7), 1.5 mg l-1 of CPPU + 50 mg l-1 of 2.4-D via flower on the outside (T8), 10 mg l-1 of IBA via leaf (T9), 10 mg l-1 of IBA via flower on the inside (T10), 10 mg l-1 of IBA via flower on the outside (T11), control (natural pollination) (T12). A randomized block design was used, with 12 treatments, four blocks and two plants per plot. The following variables were evaluated: fruit mass, number of fruits per plant, dry fruit mass, fruit length, diameter of the bowl and neck, pulp thickness in the bowl and neck, firmness, soluble solids, titratable acidity, ratio SS / AT, pH, vitamin C, carotenoids and production. The application of 10 mg l-1 of IBA via flower on the outside provides greater mass and length of the fruits and ensures greater production of 'butternut type' pumpkin. The application of 3.0 mg l-1 of CPPU via flower on the inside provides a greater number of fruits. The physicochemical quality of 'butternut-type' pumpkin fruits is not influenced by the application of auxins (IBA and 2,4-dichlorophenoxyacetic acid) and cytokinin (CPPU).