Bruno Pansera Espindola

O tratamento pré-colheita com aminoetoxivinilglicina ou ácido giberélico preserva a qualidade pós-colheita de ameixas 'Laetitia'

This work was carried out to evaluate the effects of preharvest spraying of Japanese plum trees (Prunus salicina, cv. Laetitia) with aminoethoxyvinilglycine [AVG; at 0, 90, and 120 mg (a.i.) L-1] and giberellic acid [GA3; at 0 and 100 mg (a.i.) L-1] on fruit quality after cold storage. GA3 and AVG were sprayed 28 and seven days before fruit harvesting, respectively. Fruit quality was assessed after 22 days of cold storage (0.5 oC/92% RH), followed by five days of shelf life (23 oC/60% RH). There was no interaction between AVG and GA3 for all fruit quality attributes. Preharvest spraying with GA3 and AVG increased flesh firmness, and delayed the increased of soluble solids content of the fruits. AVG delayed skin color evolution and reduced decay incidence. The treatment with GA3 caused high titratable acidity. There was a linear response to AVG doses considering the maintenance of flesh consistence and skin color, and on reduction of decay incidence.

Preservação da qualidade pós-colheita de araçá-vermelho através do tratamento com 1-metilciclopropeno e do acondicionamento em embalagens plásticas, sob refrigeração

This work was carried out to study respiration and ethylene production behavior of red strawberry-guavas and to assess the preservation of fruit postharvest quality by treatment with different doses of 1-methylcyclopropene (1-MCP) and fruit packaging in plastic films, under refrigeration. Red strawberry-guavas exhibit a climacteric behavior of respiration and ethylene production. Fruits treated with increasing doses of 1-MCP (0, 100, 300, 600, and 1,200 nL L-1) and stored at 10±1C/90±5% RH for 10 days had a substantial delay in ripening, with a better retention of texture and inhibition in the change of the color of the skin. Fruits packed in different plastic films (low density polyethylene, vinyl polychloride, and nylon based films) showed, in general terms, a better retention of texture and green color of the skin, and lower mass loss during cold storage (at 5C and 10C). The results showed that red strawberry-guavas are highly perishable, as a result of their high respiration and ethylene production rates. This requires immediate storage under refrigeration, and the treatment with 1-MCP or fruit packing in plastic films to preserve their postharvest quality.