Carina Pereira da Silva

A aplicação de 1-metilciclopropeno (1-MCP) aumenta a conservação pós-colheita de peras

One of the strategies to maintain fruit quality and increase storage time of climacteric fruit such as pear is the use of 1-methylcyclopropene (1-MCP), reducing the effects of ethylene, which is the main responsible for fruit ripening. The aim of this study was to evaluate the influence of 1-MCP on post-harvest fruit quality of ‘Abate Fetel’, ‘Packham’s’ and ‘Tenra’ pears in regular air cold storage. The fruit were treated with 1-MCP inside sealed plastic boxes at 20 oC, for 14 hours, and then transferred to cold storage (0 °C ± 1 °C; 85% ± 5% UR), where they were kept during 30, 60, 90, and 120 days. The assessed parameters were flesh firmness, DA index, pH of juice, titratable acidity and soluble solids. It was observed that 1-MCP was efficient in maintaining fruit flesh firmness of the studied cultivars kept in cold storage. Also, the degradation of chlorophyll in fruits of ‘Abate Fetel’ and ‘Packham’s’ pear was reduced with 1-MCP application.

Performance of ‘Fuji Suprema’ apple trees treated with budbreak promoters, in São Joaquim-SC

The application of rest breaking agents to overcome the lack of chilling is a common practice in apple orchards in southern Brazil. However, its necessity in areas of greater chilling accumulation, like in the city São Joaquim, Santa Catarina State (SC), has been questioned over the years. The aim of this study was to evaluate the effect of different budbreak promoters, on the performance of ‘Fuji Suprema’ apple trees, in the region of São Joaquim/SC. The study was performed at the Experimental Station of São Joaquim Santa Catarina Agricultural Research and Extension Agency (EPAGRI), in the growing seasons of 2013/2014, 2014/2015, and 2015/2016. Plant material consisted of 10-year-old ‘Fuji Suprema apple trees grafted on the rootstock ‘M.9’ and arranged in a randomized complete block design with five replicates. Treatments consisted of a nutrient solution containing soluble nitrogen and calcium (NCaS), combined with either calcium nitrate or mineral oil, at different rates; and hydrogen cyanamide combined with mineral oil. The time of application was when buds were between the stages A (dormant bud) and B (swollen bud; silver tip). The influence of treatments on flowering, budbreak, yield components, and fruit quality was assessed. Flowering and fruit quality were little affected by treatments. In the other hand, the budbreak promoters consistently improved axillary budbreak in two out of three seasons.

In vitro regeneration of ‘carrick’ pear from leaf explants

The aim of the present study was to investigate a two-step protocol as well as the effect of two types of cytokinins in the pretreatment and shoot induction media on in vitro adventitious shoot regeneration of pear leaf explants of ‘Carrick’ pear. Fully expanded healthy leaves were explanted onto shoot induction medium (SIM) following a pretreatment in liquid medium (PLM). Both media were supplemented with thidiazuron (TDZ) or 6-benzyladenine (BA) (PLM: 2 mg dm -3 ; SIM: 3 mg dm -3 ). The two-step protocol PLM [BA] + SIM [TDZ] is efficient for in vitro adventitious shoot regeneration from leaves of ‘Carrick’ pear.

PRODUCTIVE PERFORMANCE OF ‘FUJI’ APPLE TREES ON ‘JM’ SERIES ROOTSTOCKS, IN SÃO JOAQUIM/SC

Centros de pesquisa internacionais tem desenvolvido novos porta-enxertos de macieira com maior produtividade, resistencia a pragas e doencas e adaptacao a diferentes condicoes edafoclimaticas. Entao, o desempenho desses novos porta-enxertos nas condicoes das principais regioes produtoras deve ser pesquisado. O objetivo do trabalho foi avaliar o desempenho de macieiras ‘Fuji’ em porta-enxertos da serie JM e M.7, na regiao de Sao Joaquim, SC. O experimento foi desenvolvido no periodo de 2010 a 2015. O material vegetal consistiu de plantas da cultivar Fuji enxertadas nos porta-enxertos JM.2, JM.3, JM.5, JM.7, JM.8 e M.7. As mudas de haste simples foram plantadas no inverno de 2002 em espacamento de 5 x 1,5m. As plantas foram conduzidas no sistema de lider central. O delineamento experimental foi de casualizacao por blocos com quatro repeticoes. As variaveis analisadas foram producao por planta, numero de frutos por planta, produtividade, eficiencia produtiva e area da secao transversal do tronco. Os resultados obtidos mostraram que a producao de ‘Fuji’ foi maior com os porta-enxertos JM.3, JM.7, JM.8, e M.7. Os portaenxertos JM.2, JM.5, JM.7 e JM.8 induzem vigor semelhante a M.7. Os resultados tambem mostram que a massa de fruto e pouco influenciada pelo porta-enxerto.

Early performance of ‘Kampai’ and ‘Rubimel’ peach on 3 training systems

The aim of this study was to examine the early performance of ‘Kampai’ and ‘Rubimel’ peach on 3 training systems. The study was conducted between 2010 and 2013. Treatments were the training systems ‘Ypsilon’, Central Leader, and Open Center, arranged in a randomized complete block design. Assessed parameters were production per tree, fruit weight, yield, fruit firmness, and soluble solids. The early yield and economic return are greater in Central Leader training system for both cultivars. Besides, training system does not influence fruit quality attributes.

Prohexadione calcium reduces vegetative growth and increases fruit set of ‘Smith’ pear trees, in Southern Brazil

ABSTRACT: Prohexadione calcium (P-Ca) has been reported to effectively control shoot growth in several pear cultivars, but with a few reports about its efficiency under the climatic conditions of southern Brazil. Therefore, the objective of this study was to evaluate vegetative growth, production, and fruit quality of ‘Smith’ pear trees in response to the use of different rates of P-Ca in the climatic conditions of southern Brazil. The experiment was conducted during the 2013/2014 and 2014/2015 seasons, in a 6-year-old ‘Smith’ pear orchard, trained to a central-leader system, with spacing of 1.5 × 4.8 m, grafted onto Pyrus calleryana Decne. Different P-Ca rates were applied (100, 200, 300, and 400 mg·L –1 ) in different stages: first, in early spring for all treatments, and the others when shoot growth resumed (GR), but only for some treatments. Variables BASIC AREAS - Article Prohexadione calcium reduces vegetative growth and increases fruit set of ‘Smith’ pear trees, in Southern Brazil