Paclobutrazol em oliveira submetida a diferentes regimes hídricos

Abstract

ResumoA adaptação de cultivares de oliveiras às condições climáticas de algumas regiões no Brasil tem despertado o interesse de produtores para o seu cultivo. Entretanto, para a expansão das áreas produtoras torna-se necessário estudar os fatores que interferem no crescimento e na reprodução da espécie. Assim, o presente trabalho foi realizado com o objetivo de avaliar o crescimento vegetativo e o comportamento reprodutivo da oliveira submetida à aplicação de paclobutrazol (PBZ) sob condições diferentes de disponibilidade hídrica (DH). Foi utilizado o esquema fatorial 4 x 2 x 2, em blocos casualizados, com três repetições e duas plantas por parcela. Plantas da variedade Arbequina, com três anos, foram submetidas à aplicação de quatro doses de PBZ (0,0; 2,0; 4,0 e 8,0 g por planta), duas formas de aplicação (no solo e pulverização foliar) e dois regimes de DH (com e sem restrição hídrica). O PBZ foi efetivo para retardar o crescimento das plantas em ambas as formas aplicadas. Quando o PBZ foi aplicado no solo sua atuação na planta ocorreu de forma lenta. O déficit hídrico favoreceu a ação do PBZ na planta quando aplicado via foliar e retardou quando a aplicação foi realizada no solo. Não foi observado o florescimento da oliveira com a aplicação de paclobutrazol e déficit hídrico nas condições estudadas. Palavras-chave: Olea europaea L., déficit hídrico, indução floral, manejo AbstractAdaptation of olive cultivars to climatic conditions of some regions in Brazil has attracted the interest of producers for their cultivation. However, for the expansion of production areas it is necessary to study the factors that influence growth and reproduction of the species. The aim of this research was to evaluate the vegetative growth of olive trees and their reproductive performance when submitted to paclobutrazol application (PBZ) under different conditions of water availability (WA). The experiment was set in 4 x 2 x 2 factorial scheme, with randomized blocks, three replications, and two plants per plot. Three-year-old cv. Arbequina olive trees were submitted to four PBZ doses (0.0; 2.0; 4.0 and 8.0 g per plant), two application forms (in soil and foliar) and two levels of WA. PBZ was effective to slow the plants growth in both forms applied. When PBZ was applied in the soil its action in the plants was slow. Water stress favored the paclobutrazol action in plants when applied in leaves but when the PBZ was applied to the soil its performance was slow in the plants. In the studied conditions there was no olive tree flowering with Paclobutrazol and water deficit.

Reproductive and vegetative behavior of hybrid jabuticaba tree under flowering induction

“…This result differed from other studies, in which ethephon had no effect on the Eucalyptus grandis growth, but paclobutrazol did (Moraes et al 2012) on the Eucalyptus growth after 16 months (Moraes et al 2014). When paclobutrazol is applied on the soil, its effects on growth can be observed over a longer period of time for some species (Oliveira et al 2012), such as cherry trees (Prunus avium) (Facteau & Chestnut 1991) and olive trees (Fernandez-Escobar et al 1992). It may be that growth reduction takes place during later years, and this reduction may eventually occur in the jabuticaba tree as well, since its annual growth is slow.…”

“…The bioregulators that are most common and well understood are calcium carbide (Brescasin et al 2013), ethephon (Cunha 2005, Schmidt et al 2009, Moraes et al 2012) and paclobutrazol (Cavatte et al 2012, Moraes et al 2012, Oliveira et al 2012, Moraes et al 2014. These chemicals are largely used to promote flowering in mango trees (Mangifera indica) (Cardoso et al 2007, Akram et al 2013, apple trees (Malus domestica) (Schimidt et al 2009), grapevines (Vitis sp.)…”

“…These chemicals are largely used to promote flowering in mango trees (Mangifera indica) (Cardoso et al 2007, Akram et al 2013, apple trees (Malus domestica) (Schimidt et al 2009), grapevines (Vitis sp.) (Costa et al 2016), olive trees (Olea europaea) (Fernandez-Escobar et al 1992, Oliveira et al 2012, banana trees (Musa sp.) (Cavatte et al 2012), acid lime trees (Citrus latifolia Tanaka cv.…”

Zucchini cultivation under salt stress and exogenous application of paclobutrazol

“…The highest level of salinity was established based on studies conducted by Amorim (2015). PBZ concentrations were determined according to a study conducted by Oliveira et al (2012).…”

Development of Peach Flower Buds under Low Winter Chilling Conditions

“…However, the use of these techniques must be well planned so not to produce undesirable effects. If they are performed in an unbalanced manner, they will negatively influence fruit production and may even to cause a reduction in the formation of flower buds and imbalance in the photosynthetic capacity of the tree [160].…”