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In this experiment, 100 ppm gibberellic acid (GA3) was applied to Memecik olive trees in the middle of June in the (bearing) year to research the effects on yield, reducing sugar amount, and endogenous hormones with the purpose of bearing fruit regularly. | Turkish Journal of Agriculture and Forestry Turk J Agric For (2018) 42: 75-81 © TÜBİTAK doi:10.3906/tar-1705-76 http://journals.tubitak.gov.tr/agriculture/ Research Article The effects of GA3 treatment on yield, carbohydrate, and endogenous hormone changes in Memecik olive cultivar 1, 2 3 Salih ÜLGER *, Sabriye ATMACA , Sara DEMİRAL Department of Horticulture, Faculty of Agriculture, Akdeniz University, Antalya, Turkey 2 Vocational School of Gazipaşa Rahmi Ballı, Alanya Alaaddin Keykubat University, Alanya, Antalya, Turkey 3 Regional Agriculture Department, Antalya, Turkey 1 Received: 18.05.2017 Accepted/Published Online: 29.12.2017 Final Version: 26.04.2018 Abstract: In this experiment, 100 ppm gibberellic acid (GA3) was applied to Memecik olive trees in the middle of June in the ‘on’ (bearing) year to research the effects on yield, reducing sugar amount, and endogenous hormones with the purpose of bearing fruit regularly. The yield was 19.33 kg/tree in control plants and 17.33 kg/tree in GA3-treated plants in the ‘on’ year. The yield was 7.17 kg/tree in GA3-treated plants and 4.00 kg/tree in control plants in the ‘off ’ year. While GA3 treatment was not very effective on the decrease of fruit amount in the ‘on’ year, it increased fruit amount in the ‘off ’ year. Moreover, GA3 treatment did not significantly affect total reducing sugar amount, but it affected endogenous hormones. Total reducing sugar amount was determined at the 4% level in both years (‘on’ and ‘off ’). Glucose content was determined to be higher than sucrose and fructose in all plant organs and during flower bud formation periods (induction, initiation, and differentiation). Furthermore, GA3 treatment increased abscisic acid, GA3, indole-3-acetic acid, and zeatin levels during flower bud formation periods and in all plant organs (leaf, node, and fruit) in both years. Key words: Gibberellic acid, hormone, olive, sugar, yield 1. Introduction Olive is one of the most important fruits for
