pós-colheita de lichia 'bengal' tratada com etileno e 1-metilciclopropeno postharvest of lychee 'bengal' treated with ethylene and 1-methylcyclopropene

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ID: 222270
2011
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Abstract
Objetivou-se determinar as respostas fisiológicas e bioquímicas associadas ao uso de etileno e 1-metilciclopropeno (1-MCP) na conservação pós-colheita de lichias, assim como a influência desses tratamentos isolados ou combinados no escurecimento desses frutos. Após a colheita, foram aplicados os seguintes tratamentos: sem aplicação de 1-MCP ou etileno; etileno (20µL L-1, por 6 horas); 1-MCP (300nL L-1, por 12 horas) e etileno (20µL L-1, por 6 horas) + 1-MCP (300nL L-1, por 6 horas). Após os tratamentos, os frutos foram armazenados a 5°C e 90% UR durante 30 dias, sendo avaliados a cada 10 dias (+3 dias de comercialização simulada a 25°C e 65% UR). Avaliou-se a produção de etileno, taxa respiratória, sólidos solúveis (SS), perda de massa fresca, coloração (luminosidade - L* e a*) e atividade da polifenoloxidase (PPO). A produção de etileno e taxa respiratória não apresentaram diferenças significativas entre os tratamentos e os SS decresceram ao longo do armazenamento, mas também sem diferenças entre os tratamentos. A atividade da enzima PPO foi aumentada, sendo correlacionada com os índices decrescentes de L* e a* presentes nos frutos, ocorrendo, paralelamente, aumento da perda de massa dos frutos. Conclui-se que o escurecimento do pericarpo da lichia está relacionado à perda de massa fresca e aumento da atividade da PPO e que nenhum dos tratamentos utilizados evitou o escurecimento dos frutos.
The objective was to determine the physiological and biochemical changes associated with the use of ethylene and 1-methylcyclopropene (1-MCP) on postharvest conservation of lychees as well as the influence of these treatments alone or in combination on skin browning of fruit. After harvest, it was applied the following treatments: without application of 1-MCP or ethylene, ethylene (20mL L-1 for 6 hours), 1-MCP (300nL L-1 for 12h) and ethylene (20mL L-1 for 6 hours) + 1-MCP (300nL L-1 for 6 hours). After treatments, fruits were stored at 5°C and 90% RH for 30 days and were evaluated every 10 days (+3 days of simulated marketing at 25°C and 65% RH). The ethylene production, respiration rate, soluble solids (SS), weight loss, color (lightness - L * and a*) and polyphenoloxidase activity (PPO) were evaluated. Ethylene production and respiration rate showed no significant differences between treatments, and SS decreased over the storage, but there was also no difference between treatments. The enzyme activity showed an increase in PPO, which was correlated to the decreasing rates of L * and a*, occurring in parallel, increased fruit weight loss. It is concluded that the skin browning of lychee is related to weight loss and increased activity of PPO, and that none of the treatments prevented the sking browning of fruit.
Reference Key
lima2011cinciaps-colheita Use this key to autocite in the manuscript while using SciMatic Manuscript Manager or Thesis Manager
Authors ;Fabio Vaz de Lima;Juan Saavedra del Aguila;Edwin Moisés Marcos Ortega;Ricardo Alfredo Kluge
Journal Trials
Year 2011
DOI
DOI not found
URL
http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-84782011000700006
Keywords
phytohormone

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