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Consumer acceptance of Keitt mangoes (Mangifera indica L.) is significantly affected by their slow postharvest ripening. This work used gaseous chlorine dioxide (ClO2(g)) to prepare the ready-to-eat Keitt mango and explored the potential mechanisms for the mango ripening. Harvested mangoes were treated with 20 mg·L−1 of ClO2(g) or ethephon for 3 h (25 °C) and left in a climatic chamber with a temperature of 25 ± 1 °C and a relative humidity of 85 ± 5% for 4 d. The results showed that ClO2(g) treatment significantly promoted the orange coloration of mango flesh compared to the untreated control group. Moreover, ClO2(g) treatment significantly elevated the total soluble solids, total soluble sugar, and total carotenoids content of mangoes, whereas the firmness and titratable acidity were reduced. ClO2(g)-treated mangoes reached the edible window on day 2, as did mangoes treated with ethephon at the same concentration, except that the sweetness was prominent. The residual ClO2 level of the mangoes was <0.3 mg/kg during the whole storage time, which is a safe level for fruit. In addition, ClO2(g) significantly advanced the onset of ethylene peaks by 0.5 days and increased its production between days 0.5 and 2 compared to the control group. Consistently, the genes involved in ethylene biosynthesis including miACS6, miACO1, and miACO were upregulated. In sum, ClO2(g) can be a potential technique to reduce the time for harvested mango to reach the edible window, and it functions in modulating postharvest ripening by inducing ethylene biosynthesis. [ABSTRACT FROM AUTHOR]

A significant amount of chemical fertilizers are lost due to their widespread use in regions with high temperatures, which also pollute the ecosystem and lower soil fertility. Consequently, using highly nutritious, environmentally friendly fertilizers that are also compatible with the soil and environment is imperative. The application of fertilizers that give macro- and micronutrients to fruit trees is one of the key components of biofertilizer and nitrogen slow release fertilizers in agriculture. A two-year trial was conducted during the 2021 and 2022 seasons in Keitt mango trees orchard about five years old grown in sandy soil under a drip irrigation system from a well at a private orchard, in New Valley Governorate, Egypt. The main objective of this work is to study the effect of three rates of Nitrobein biofertilizer (0.0, 200, and 400 g/tree) and four rates of urea-formaldehyde fertilizer (0.0, 500, 750, and 1000 g/tree) on vegetative growth parameters, yield and fruit quality of Keitt mango trees. Briefly, Nitrobein and urea-formaldehyde treatments enhanced all studied growth, yield, and fruit quality traits. Nitrobein biofertilizer at 400 g/tree combined with ureaformaldehyde fertilizer at 1000 g/tree treatment proved to be the most efficient treatment in this respect. [ABSTRACT FROM AUTHOR]

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Consumer acceptance of Keitt mangoes (Mangifera indica L.) is significantly affected by their slow postharvest ripening. This work used gaseous chlorine dioxide (ClO2(g)) to prepare the ready-to-eat Keitt mango and explored the potential mechanisms for the mango ripening. Harvested mangoes were treated with 20 mg·L−1 of ClO2(g) or ethephon for 3 h (25 °C) and left in a climatic chamber with a temperature of 25 ± 1 °C and a relative humidity of 85 ± 5% for 4 d. The results showed that ClO2(g) treatment significantly promoted the orange coloration of mango flesh compared to the untreated control group. Moreover, ClO2(g) treatment significantly elevated the total soluble solids, total soluble sugar, and total carotenoids content of mangoes, whereas the firmness and titratable acidity were reduced. ClO2(g)-treated mangoes reached the edible window on day 2, as did mangoes treated with ethephon at the same concentration, except that the sweetness was prominent. The residual ClO2 level of the mangoes was 2(g) significantly advanced the onset of ethylene peaks by 0.5 days and increased its production between days 0.5 and 2 compared to the control group. Consistently, the genes involved in ethylene biosynthesis including miACS6, miACO1, and miACO were upregulated. In sum, ClO2(g) can be a potential technique to reduce the time for harvested mango to reach the edible window, and it functions in modulating postharvest ripening by inducing ethylene biosynthesis.

Highlights • The aroma-active compounds of 'Keitt' mango juice produced in China were identified. • The changes of 12 major aroma-active compounds during processing were characterized. • Quantitative descriptive analysis was applied to validate the sensory differences. • This work would help to understand aroma determinants during mango processing. Abstract The commercial mango cultivar Keitt lacks a theoretical foundation for aroma control during processing. To discriminate the aroma-active compounds in fresh mango juice, odor activity value (OAV) and detection frequency analysis (DFA) were used collaboratively. A total of 12 components were identified as major aroma-active compounds, among which 2,4-dimethylstyrene was firstly confirmed as an aroma compound in mango. The changes of aromatic compounds during pasteurization and high hydrostatic pressure (HHP) sterilization were further studied. Quantitative descriptive analysis (QDA) was applied to validate the sensory differences. Principal component analysis (PCA) based on aroma compound variation coincided with the overall note. QDA demonstrated that fresh mango juice was the most accepted, followed by HHP and pasteurized juices. The finding might be well correlated with the differences in 6 odor notes. This work would help to better understand and control the critical aroma determinants for mango juice processing. [ABSTRACT FROM AUTHOR]

A controlled atmosphere (CA) is an agricultural storage method which can control the atmosphere around the fruit. It is an atmosphere in which oxygen, carbon dioxide and nitrogen concentration as well as temperature and humidity are regulated. This system can reduce metabolic activity, control some pathogens and insects, and thus prolong the postharvest life of the fruit. Glycolysis is the basis of both anaerobic respiration and aerobic respiration, which occurs in nearly all organisms. Three enzymes regulate glycolysis by catalyzing nonequilibrium reactions: hexokinase, phosphofructokinase, and pyruvate kinase. The pentose phosphate pathway (PPP) is a process that generates NADPH and pentoses (5-carbon sugars). In this work we studied the changing of the activities of phosphofructokinase (PFK) and Glucose-6-phosphate dehydrogenase (G6PDH) and fruit quality of mango stored under the controlled atmosphere CA at 20°C. This study was carried out on mango fruits (Mangifera indica L.) cv. Keitt. The storage of fruits under the CA retarded ripening and did not affect the quality attributes of Keitt mango. There was a significant decreasing in the activities of PFK and G6PDH as compared with control under controlled atmosphere storage (CAS) used in this work. These results indicate a potential for the application of CA for postharvest ripening control of mango. The optimal CA for long-term storage of "Keitt" mango at 20 °C is (6% O2 + 9% CO2+ 85% N2); under these conditions the storage life of mango can be extended up to 11 days. [ABSTRACT FROM AUTHOR]