Ultraviolet C (UV-C) radiation is known for preventing fungal decay and enhancing phytochemical content in fruit when applied postharvest. However, limited knowledge is available regarding fruit responses to preharvest application of UV-C radiation. Thus, the effects of UV-C radiation on photosynthetic efficiency, dry matter accumulation and partitioning, fruit yield and decay, phytochemical content, and relative transcript accumulation of genes associated with these metabolic pathways were monitored in strawberry (Fragaria x ananassa Duch.) cv. Camarosa. A reduction in photosynthetic efficiency was followed by a decrease in light harvesting complex LhcIIb-1 mRNA accumulation as well as a decrease in yield per plant. Phenylalanine ammonia lyase activity, phenolic, anthocyanin, and L-ascorbic acid contents were higher in UV-C treated fruit. In addition, preharvest UV-C treatment reduced microorganism incidence in the greenhouse and on the fruit surface, increased the accumulation of β-1,3-Gluc and PR-1 mRNA, and prevented fruit decay.
Este é um artigo publicado em acesso aberto (Open Access) sob a licença Creative Commons Attribution, que permite uso, distribuição e reprodução em qualquer meio, sem restrições desde que o trabalho original seja corretamente citado Atmosfera controlada associada ao 1-metilciclopropeno na preservação da qualidade de kiwi 'tewi' Controlled atmosphere associated with 1-methylcyclopropene in the preservation of 'Tewi' kiwifruit quality ResumoO objetivo deste trabalho foi determinar os efeitos de diferentes tecnologias de armazenamento na qualidade físico-química de kiwis da cultivar Tewi. Após a colheita, parte dos frutos foi submetida ao tratamento com 1-metilciclopropeno (1-MCP) e, posteriormente, frutos tratados e não tratados foram submetidos a diferentes condições de armazenamento, conforme segue: armazenamento em temperatura ambiente (20 °C ± 0,5 °C) durante 12 dias; armazenamento refrigerado (0°C ± 0,5°C) com ou sem controle da atmosfera (3 KPa O 2 e 5 KPa CO 2 ), e com ou sem absorção de etileno durante dois e quatro meses. Foram avaliadas a firmeza de polpa, o teor de sólidos solúveis e a acidez titulável. Verificou-se que, independentemente da tecnologia de conservação, houve uma diminuição na firmeza de polpa já aos dois meses de armazenamento, sendo a condição atmosfera controlada associada ao uso do 1-MCP a mais eficaz na retenção desse atributo. Frutos mantidos em temperatura ambiente apresentaram relação direta entre a redução da firmeza de polpa e o aumento do índice de sólidos solúveis; no entanto, após o armazenamento, essa relação nem sempre ocorreu. A maior acidez titulável foi verificada em frutos que receberam 1-MCP. Kiwis 'Tewi' apresentam bom potencial de conservação, podendo permanecer armazenados por até quatro meses em atmosfera controlada associada ao controle do etileno pelo uso de 1-MCP ou por absorção do etileno. Palavras-chave: Actinidia deliciosa; Qualidade físico-química; Pós-colheita; Firmeza de polpa. SummaryThe aim of this study was to evaluate the effect of different storage technologies on the physical and chemical qualities of 'Tewi' kiwifruits. After harvesting, part of the fruits was treated with 1-methylcyclopropene (1-MCP), and then both the treated and non-treated fruits were stored under different conditions, as follows: storage at room temperature (20 °C ± 0.5 °C) for twelve days; refrigerated storage (0°C ± 0.5°C), with or without a controlled atmosphere (3% O 2 and 5% CO 2 ); and storage with or without ethylene adsorption for two and four months. The firmness of the flesh, soluble solids content and titratable acidity were evaluated during storage. It was noted that regardless of storage technology there was a reduction in firmness after two months. The controlled atmosphere conditions with 1-MCP were the most effective in retaining firmness. Fruits kept at room temperature showed a direct relationship between the reduction in flesh firmness and the increase in soluble solids content, although this relationship was not always observed after storage. The highest titr...
BACKGROUND The year‐round availability of apples (Malus × domestica Borkh.) depends on post‐harvest technologies, which are essential for the retention of fruit sensory and chemical properties by delaying senescence. The effectiveness of strategies for preserving the quality of apples depends on complex interactions between the storage environment and endogenous biological factors. In the current work, we integrated instrumental, sensory, and transcriptional data to determine the role of conservation technologies cold storage, controlled atmosphere, and 1‐methylcyclopropene‐mediated ethylene blockage on the long‐term conservation of apples. RESULTS The results demonstrated that inhibition of the consumer's perception of the apples’ ethylene content is essential for long‐term cold storage, and such quality conservation can be achieved by reducing oxygen pressure. Overall appreciation of apples after storage was determined mainly by their texture, with crispness and juiciness contributing favorably, and mealiness contributing negatively. Reduced oxygen pressure and inhibition of ethylene perception exerted distinct effects on the transcription of candidate genes associated with ripening in apple. Hexose and cell‐wall carbohydrate metabolism genes exhibit distinct expression patterns under storage. CONCLUSION Inhibition of ethylene perception and reduction of relative oxygen pressure under cold storage both promote similar conservation of apple sensory traits under long‐term cold storage. Texture was the main contributor to global appreciation of apples subjected to long‐term storage. The conditions that were investigated were able to delay, but not fully prevent, senescence, as evidenced by physicochemical and gene expression analyses. The expression of gene‐encoding enzymes involved in hexose metabolism was mainly developmentally regulated, whereas storage conditions exerted a stronger effect on the expression of genes associated with cell‐wall metabolism. © 2022 Society of Chemical Industry.
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