Marcos Vinícius Hendges

Qualidade de maçãs 'Royal gala' submetidas ao dano mecânico por impacto e aplicação de 1-metilciclopropeno em dois sistemas comerciais de armazenamento

ABSTRACT - The objective of this study was to evaluate the effects of impact injury and treatment with 1-methylcyclopropene (1-MCP) on the quality of ‘Royal Gala’ apples in cold storage (CS) and controlled atmosphere condition (CA). The treatments were impact injury (with and without impact injury) combined with 1-MCP (0 and 625nL L -1 ). The fruits were stored for four months in CS (0°C ± 1oC and 92 ± 2% RH) (experiment 1) and for eight months in CA (1.2 kPa O 2 + 2.0 kPa CO 2 , 0°C ± 0.1oC and 96 ± 2% RH) (experi-ment 2). In CS, fruits treated with 1-MCP showed higher flesh firmness, besides larger darkened area in the damaged place, at removal from storage. After CS followed by seven days at an ambient conditions, fruits treated with 1-MCP showed higher titratable acidity, skin darkening and smaller darkening depth of flesh in the place of the damage. In CA, 1-MCP application resulted, at removal from CA storage, fruits with lower levels of soluble solids content and higher skin darkening in the place of the damage, and, after seven days of shelf life, fruit showed greater depth of darkening of the pulp in the damaged place. The impact injury caused darkening of the pulp of apples ‘Royal Gala’. 1-MCP did not inhibit the effects of impact injury, but preserved fruit quality, especially in CS. Index terms: ripening, ethylene, cold storage, controlled atmosphere.

Amadurecimento e qualidade de ameixas ‘Laetitia’ tratadas com ácido salicílico e 1-metilciclopropeno

Ripening and quality of ‘Laetitia’ plums treated with salicylic acid and 1-methylcyclopropene The aim of this study was to evaluate the effect of salicylic acid (SA), alone and combined with 1-methylcyclopropene (1-MCP), on ripening and quality of ‘Laetitia’ plums under cold storage (40 days at 1 ± 0.1 °C / RH 94 ± 2%). The treatments were: control; 1 mM of AS; 5 mM of AS; 10 mM of AS; and 5 mM of AS + 1-MCP (1 μL L -1 ). Fruit treated with 10 mM of AS showed higher ethylene production rate and higher incidence of skin black spots at removal from cold storage, and higher flesh browning after three days at ambient condition. In fruit treated with 5 mM of AS, the treatment with 1-MCP reduced the rate of ethylene production and reduced the incidence of flesh browning, increased the texture attributes, and reduced the skin red color . AS has no ef fect on flesh browning incidence and ripening of ‘Laetitia’ plums and increases the incidence of skin black spots at doses above 5 mM. In fruit treated with 5 mM of AS, the treatment with 1-MCP delays ripening and maintains the quality of ‘Laetitia’ plums.

Qualidade de maçãs 'Fuji Suprema' submetidas a diferentes tipos de dano mecânico

ABSTRACT- The objective of this study was to evaluate the effect of mechanical damage by impact, com-pression and cut on the quality of ‘Fuji Suprema’ apples in ambient conditions. The treatments were: control (no mechanical damage) and mechanical damage by impact, compression and cut. Different mechanical damages did not influence the flesh firmness and hue angle of the skin. Cut damage provided fruits with lower titratable acidity, nine days after damages application. Fruits submitted to damage by impact showed higher soluble solids content, 15 days after damages application. For the L color index of the flesh, cut and impact damages caused the smallest value in all evaluations, characterizing the flesh browning. However, this effect was not observed in the skin. Cut damage presented 100% of decay incidence to the nine days after mechanical damages application. In general, it can be conclude that ‘Fuji Suprema’ apples submitted to damage by impact and cut showed loss quality, because they have flesh browning incidence in the dam-age place. Moreover, cut damage reduces postharvest life of fruits, facilitating higher percentage of rots.Index terms: Malus domestica, injury, postharvest.