Effect of plant growth regulators in the refrigerated conservation of acerola fruits (Malpighia glabra L.)

Com o objetivo de avaliar o uso do ácido giberélico (GA3) e da benzilaminopurina (BAP) na conservação de acerolas (Malpighia glabra L.) colhidas no estádio verde e armazenadas sob refrigeração, acerolas foram submetidas aos seguintes tratamentos, sob imersão por 30 minutos: controle (água), 50 mg L-1 e 100 mg L-1 de GA3, 50 mg L-1 e 100 mg L-1 de BAP. Após os tratamentos, os frutos foram deixados para secar ao ar em local fresco e, então, embalados em bandejas de isopor cobertas com filme de polietileno e armazenados em câmara B.O.D a 8±1ºC, por 14 dias. As avaliações foram realizadas em intervalos de 4 dias. Os frutos amostrados foram submetidos a avaliações de coloração, teor de sólidos solúveis, acidez titulável e teor de ácido ascórbico. A análise dos resultados mostrou que a aplicação dos reguladores não teve efeito no aumento da conservação refrigerada de acerolas e que somente a refrigeração foi suficiente para conservá-las durante 14 dias.With the objective of preserving the physicochemical characteristics from green stage harvested of acerola fruits (Malpighia glabra L.), these were submitted to the following 30-minute immersion treatments: control (water), 50mg L-1 GA3, 100mg L-1 GA3, 50mg L-1 BAP (benzylaminopurine), and 100mg L-1 BAP. After treatment, the fruits were air-dried in a cool place and then packaged in styrofoam trays wrapped with polyethylene film, and stored in a BOD incubator at 8°C for 14 days. Evaluations were performed at 4 days intervals. The fruits were evaluated for coloration, soluble solids content, trituratable acidity, and ascorbic acid content. The analysis of the results showed that the application of plant growth regulators did not have effect in the increase of the refrigerated conservation of acerola fruits and that only the cooling was enough to conserve its for 14 days

Control of vegetative growth and flowering on Mango cv. kent with plant growth regulators

Paclobutrazol applied to the soil is used for the production management of mangoes in most of the orchards, but it presents as disadvantage the greater persistence in plant and soil. Three growth regulators (prohexadione-Ca, trinexapac-ethyl and chlormequat chloride) were foliar applied, at two dosages and compared to paclobutrazol applied as soil-drench. The experiment was conducted in the region of the Sao Francisco Valley, Petrolina, PE, from December 2007 to July 2008, in a mango orchard that has a spacing of 8 m between lines and 5 m between plants. In order to compare the effects of the treatment, data were evaluated regarding to vegetative growth (number, length and leaf number of vegetative branches) and flowering (percentage and panicles length). The combination of PBZ, soil applied with ProCa, foliar applied was the most efficient in controlling vegetative growth of branches of the mango 'Kent', but not regarding to flowering, where there were no differences between treatments

Effect of plant growth regulators on rooting of Poncirus trifoliata var. monstrosa (T. Ito) cuttings

O trabalho objetivou estudar os efeitos de reguladores vegetais no enraizamento de estacas caulinares de Flying Dragon [Poncirus trifoliata var. monstrosa (T. Ito)]. Na metade de cada estação do ano, ramos de citros foram coletados (4 experimentos), a partir dos quais foram retiradas estacas com 10 cm de comprimento com uma folha cortada ao meio. As bases das estacas foram tratadas com os seguintes reguladores vegetais na forma de talco: Testemunha (H2O); IBA 0,5%; NAA a 0,5%; IBA + ácido caféico a 0,5%, e NAA + ácido caféico 0,5%. As estacas foram plantadas em bandejas de isopor contendo fibra de coco e mantidas por três meses em câmara de nebulização. Os resultados mostraram que para a propagação desta espécie por estaquia, a coleta dos ramos deve ser no outono e que as mesmas sejam tratadas com a mistura de NAA + ácido caféico, ambos a 0,5%.The work aimed study the effects of plant growth regulators on the rooting of 'Flying Dragon' stem cuttings [Poncirus trifoliata var. monstrosa (T. Ito)]. Citrus branches were collected of each season of the year (4 experiments). Cuttings (10-cm-long) containing one half leaf were obtained from these branches. The base of the cuttings was treated with plant growth regulators in the talc formulation: Control (H2O); IBA 0.5%; NAA 0.5%; IBA + caffeic acid 0.5%; and NAA + caffeic acid 0.5%. The cuttings were planted in trays containing coconut fiber and maintained for three months in the misting chamber. The cuttings collected in the fall and treated with a mixture of NAA 0.5% and caffeic acid at 0.5% showed higher rooting percentage