Alterações pós-colheita e resposta ao etileno em frutos de abobrinha Menina Brasileira

• Autor(a) principal: Araújo, Fernanda Ferreira de
• Data de Publicação: 2014
• Tipo de documento: Dissertação
• Idioma: por
• Título da fonte: LOCUS Repositório Institucional da UFV
• Texto Completo: http://locus.ufv.br/handle/123456789/4635
• topic: Abobrinha; Pós-Colheita; Etileno; Respiração; Zucchini; Postharvest; Ethylene; Breathing; CNPQ::CIENCIAS AGRARIAS::AGRONOMIA::FITOTECNIA

In the Cucurbitaceae family are inserted pumpkins and squash of the genus Cucurbita. The squash can be eaten in the mature or immature. In immature form, the fruit is called zucchini or summer squash being consumed that way in Brazil, the fruits of the species Cucurbita pepo and Cucurbita moschata. The respiration is the primary physiological process that continues to occur after harvest. This study aimed to analyze the behavior post-harvest of summer squash 'Menina Brasileira' and determine the level of sensitivity in response to application of doses of ethylene. To analyze the post-harvest behavior, the fruits were picked, selected and placed individually in 3 liter bottles, hermetically sealed for air accumulation. Samples of the air contained within the vials were removed and injected into a gas chromatograph for analysis of ethylene and CO 2 . Then the fruits were removed from the bottles to the following assessments: fresh weight loss, acidity, soluble solids, content of chlorophyll, sugar and starch contents. The sensitivity of the fruit to ethylene was evaluated at concentrations of 0.1, 1, 10, 100 and 1000 μL L -1 of ethylene. Reviews of loss of weight, sugar and starch contents, content of chlorophyll, content of malondialdehyde (MDA) and electrolyte leakage were performed. The highest rates of production of CO 2 and ethylene were detected immediately after harvest, possibly due to stress caused by the harvesting and transportation of fruits. On the fourth day evaluation noted shriveling and wrinkling of the tissues caused by high water loss. Occurred decline of total soluble sugars, reducing sugars and starch, and increased non- reducing sugars during the storage time. The fruits of summer squash 'Menina Brasileira' present median sensitivity to ethylene. Ethylene did not stimulate the fresh weight loss by fruits. Fruits were small changes in the attributes of internal quality, but changes occurred in the external appearance, with decreased chlorophyll content and epicarp viiidamage due to loss of cell membrane integrity characterized by increased MDA content and electrolyte leakage.