ORIGINAL ARTICLE https://doi.org/10.1007/s10341-019-00466-w Erwerbs-Obstbau Metconazole on Inhibition of Gibberellin Biosynthesis and Flowering Management in Mango Ítalo Herbert Lucena Cavalcante 1,5 · Gilberto José Nogueira e Silva 2 · Jeferson Antônio Cavacini 1 · Renata Araújo e Amariz 1 · Sérgio Tonetto de Freitas 3 · Kellem Ângela Oliveira de Sousa 4 · Marcelle Almeida da Silva 1 · Jenilton Gomes da Cunha 1 Received: 9 April 2018 / Accepted: 6 December 2019 © Springer-Verlag GmbH Deutschland, ein Teil von Springer Nature 2019 Abstract Gibberellins have been shown to suppress floral development in mango, thus farmers have used growth retardants, especially paclobutrazol, to inhibit gibberellin biosynthesis, but in many countries such as Brazil, this is the unique registered molecule, which affects sustainability of the mango industry. The objective of this study was to evaluate the effect of metconazole on gibberellin biosynthesis inhibition and carbohydrate accumulation in ‘Palmer’ mango grown in semi-arid conditions. The experiment was accomplished from 2015 to 2017 in an experimental orchard located in Petrolina, Pernambuco, Brazil. The experimental design were randomized blocks with five treatments, five replications and three plants per replication. The treatments consisted of metconazole (0, 0.7, 1.0 or 1.3g) and paclobutrazol (1.0g) application per linear meter of plant canopy. According to the results, metconazole efficiently inhibits gibberellin biosynthesis in mango, but it affects AG1 + AG3 (Gibberellic Acid) and AG4 differently. Therefore, metconazole can potentially be used on mango flowering management, but further studies are required to determine specific management practices. Keywords Mangifera indica L · Plant growth regulator · Flowering management · Gibberellin inhibition Metconazol zur Hemmung der Gibberellin-Biosynthese und zur Steuerung der generativen Phase bei Mango Schlüsselwörter Mangifera indica L · Pflanzenwachstumsregulator · Blütenmanagement · Gibberellinhemmung · Generative Phase  Ítalo Herbert Lucena Cavalcante italo.cavalcante@univasf.edu.br, italohlc@pq.cnpq.br 1 Center of Agrarian Sciences, Federal University of São Francisco Valley, Rodovia BR 407, KM 119, Lote 543 PSNC, s/nº, C1, 56300-990 Petrolina, Pernambuco, Brazil 2 Bioservice consulting, Petrolina, Brazil 3 Brazilian Agricultural Research Corporation, Petrolina, Brazil 4 Federal University of Piauí, Bom Jesus, Brazil 5 National Council for Scientific and Technological Development (CNPq), Brasília, Brazil Introduction Brazil is one of the largest mango (Mangifera indica) ex- porter countries in the world (FAO 2017), which has been especially grown in São Francisco Valley (Carneiro et al. 2017), where more than 90% of Brazilian exported mango are produced (ALICEWEB 2016). Studies have shown that gibberellins inhibit floral de- velopment in mango (Davenport 2009). However, Sandip et al. (2015) argue that the floral inhibitory response of gib- berellins depends on concentrations, growth stage, and en- vironmental conditions. Indeed, there are limited evidences to understand the molecular events involved in the inhibi- tion of floral initiation by gibberellins in mango and Up- reti et al. (2013) suggest that increased gibberellin biosyn- thesis might enhance or maintain the production of other K