CONTROLE DO FLORESCIMENTO NATURAL DO ABACAXIZEIRO ‘PÉROLA’ E ‘VITÓRIA’ UTILIZANDO CLORIDRATO DE AVIGLICINA (AVG)

• Ano de defesa: 2021
• Autor(a) principal: Pires, Andrea
• Tipo de documento: Dissertação
• Tipo de acesso: Acesso aberto
• Idioma: por
• Instituição de defesa: Universidade Federal do Espírito Santo; BR; Mestrado em Agricultura Tropical; Centro Universitário Norte do Espírito Santo; UFES; Programa de Pós-Graduação em Agricultura Tropical
• Palavras-chave em Português: Ananas comosus L.; floração; inibição floral; subject.br-rjbn; Agronomia
• Link de acesso: http://repositorio.ufes.br/handle/10/14753

The main factor that makes it difficult to harvest pineapple during periods of more advantageous prices on the market is the natural induction of flowering. Aviglycine hydrochloride (AVG) is an inhibitor of ethylene synthesis worldwide recommended for the control of natural pineapple flowering, however, the recommended dose depends on the environment, genotype and age of the plant. The objective was to evaluate the effect of AVG concentration and control periods on pineapples ‘Pérola’ and ‘Vitória’. The study was conducted in the field, in the municipality of Sooretama, Espírito SantoES, Brazil. The experimental design used was randomized blocks in a 3x3 + 1 factorial scheme, consisting of three concentrations (100, 200 and 400 mg L-1) and three control periods (April-July, May-July and June-July) that corresponded to flowering control in the periods from April to July, May to July and June to July, respectively. The additional treatment (control) was the plants without any application. Each treatment consisted of four replications and each plot consisted of 24 plants. Weekly assessment of the inflorescence emergence was performed, calculating the accumulated flowering. Physical-chemical analysis of the collected fruits was carried out and the data were submitted to analysis of variance and Tukey test (p <0.05). AVG controls the natural flowering of the pineapple of both cultivars and the effect was proportional to the increase in concentration. However, with the increase in AVG concentration and number of applications, the phytotoxic effects and the reductions in the levels of starch and photosynthetic pigments in the leaves were greater, reducing the vegetative development and the mass of the fruit. The cultivar Pérola was more susceptible to controlling natural flowering, with a longer period of floral inhibition and damage to vegetative and reproductive development when 400 mg L-1 was applied. The weight of the fruits of cultivar Pérola decreased by 15.26%, with an increase in acidity and a reduction in the ratio, while for 'Vitória', the reduction in mass was 30.96%, with a small increase in the levels of soluble solids and reduction in vitamin C. Therefore, we recommend that AVG be applied at a concentration of 100 mg L-1 before climatic conditions occur for natural floral induction, which in the case of the northern coast of Espírito Santo, Brazil, occurs between June and June, and may extend until August, if there are night temperatures below 20 ° C.