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Crop Production • Rev. Ceres 69 (6) • Nov-Dec 2022 • https://doi.org/10.1590/0034-737X202269060007   copy

Quality changes of acerola fruit harvested at different maturity stages and exposed to external ethylene1 1 This study is part of the first author’s Master Dissertation. Financial support was granted by the Brazilian Agricultural Research Corporation, Embrapa, as well as scholarships funded by the Fundação de Amparo à Ciência e Tecnologia de Pernambuco (FACEPE).

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ABSTRACT

Although acerola (Malpighia emarginata D.C.) has been suggested to be a climacteric fruit, little is known about its sensitivity to exogenous ethylene. The objective of the study was to evaluate the quality changes of acerola fruit at two harvest maturity stages in response to external ethylene application. ‘Flor Branca’ and ‘Junko’ acerolas were harvested at the maturity stages 1 (green fruit with density>1 g cm-3) and 2(green fruit with density <1 g cm-3) and were treated with 0 or 1,000 µL L-1 of ethylene for 24 hours at 12 ºC.The fruit were stored at 12 ºC with relative humidity of 90-95% for 14 days. Both cultivars harvested at the maturity stage 2 showed skin color change from green to red during storage, which was not observed in fruit harvested at the maturity stage 1.External ethylene had no effect on 'Flor Branca' and 'Junko' acerolas respiration rate, flesh firmness, skin color, weight loss, soluble solids (SS), titratable acidity (AT), SS/AT ratio, and ascorbic acid contents. The classification of green acerolas by density was an effective approach to determine fruit harvest maturity for fresh consumption.

Keywords
biometry; Malpighia emarginata D.C.; respiration rate; flesh firmness; skin color; ripening

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