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Hnin Phyu Lwin,이진욱 한국원예학회 2021 Horticulture, Environment, and Biotechnology Vol.62 No.1
The eff ect of preharvest sprayable 1-methylcyclopropene (1-MCP) on fruit quality and certain targeted major metaboliteswas investigated in ‘Chuhwangbae’ pears during short-term cold storage and shelf life. Preharvest 1-MCP applicationaff ected methionine, sucrose, and total fl avonoid content and fruit decay. During cold storage and shelf life, numerous fruitquality attributes and specifi c targeted metabolites were aff ected not by preharvest 1-MCP application but by the storageduration. Overall responses in the normalized heatmap matrix and principal component analysis (PCA) loading plot showedthat preharvest sprayable 1-MCP treatment enhanced the incidence of physiological disorders and suppressed the responsesof targeted metabolites compared with that in untreated fruit. The results obtained using the PCA score plot showed thatphysiological and biochemical parameters of the fruit after preharvest 1-MCP treatment were highly separated and divergedbased on the storage duration. Nevertheless, preharvest 1-MCP treatment did not signifi cantly aff ect the physiological andbiochemical responses associated with fruit parameters or soluble carbohydrates and free amino acids contents in cold-storedpears. Therefore, the results suggest that preharvest sprayable 1-MCP application may not have strong positive eff ects on thepostharvest quality attributes of ‘Chuhwangbae’ pears during cold storage and shelf life.
Lwin Hnin Phyu,이진욱 한국원예학회 2022 Horticulture, Environment, and Biotechnology Vol.63 No.4
‘Wonhwang’ Asian pears could be intolerant to the incidence of physiological disorders during long-term storage. 1-Methylcyclopropene (1-MCP) technology is commonly used in the fruit industry to retain fruit quality during cold storage and the handling period. Thus, the objectives of this study were to evaluate the effectiveness of postharvest 1-MCP treatment on fruit physiological characteristics, physiological disorders, and the major metabolic responses of organic acids, soluble carbohydrates, and free amino acids in long-term cold-stored ‘Wonhwang’ pears. The 1-MCP treatment reduced flesh firmness but increased weight loss during storage. It also reduced the content of fructose, glucose, and malic acid but retained higher levels of sucrose and sorbitol during the second half of storage compared to the untreated control. The 1-MCP application enhanced the severity and incidence of cavities and water soaking during cold storage and increased methionine levels in cold-stored pears. The scores plot of principal component analysis indicated that 1-MCP treatment caused the response variables to diverge during the second half of storage. Additionally, the correlation coefficient network indicated that 1-MCP treatment differentially mediated the correlation coefficients of fruit quality parameters and targeted metabolites in long-term cold-stored pears. These results suggest that postharvest 1-MCP application affects the differential responses of fruit quality parameters in Asian pears stored at 0.5 °C for up to 6 months.
Lwin Hnin Phyu,Han Seung Yeon,Byeon Si-Eun,Lee Jinhee,Yoo Jingi,Jung Ha-il,이진욱 한국원예학회 2023 Horticulture, Environment, and Biotechnology Vol.64 No.4
Onion bulbs are typically stored at lower storage temperature for a long time, permitting their year-round availability in the market. The objective of this study was to evaluate the relationships among onion bulb quality, targeted major metabolites, and mineral nutrient contents in long-term cold-stored onion bulbs from four major diff erent commercial onion packinghouses. Bulb fresh and dry weight, fructose, glucose, citric acid, total phenolic compounds, and ABTS were highest in Muan, compared with the other packinghouses. The contents of K, Mn, Zn, and Cu, the ratios of K/Mg, K/Ca, and Mn/Ca, and the contents of total phenolic compounds, total fl avonoids, and total anthocyanins were highest in Hamyang, compared with the other packinghouses. The contents of individual free amino acids were most likely highest in Hamyang and Mungyeong packinghouses, compared with the other packinghouses. The overall responses of bulb quality, targeted major metabolites, and mineral nutrients substantially aff ected the diff erential expression pattern of principal component analysis among four commercial packinghouses. While fructose was positively correlated with glucose, it was negatively correlated with methionine, leucine, valine, isoleucine, and aspartic acid. Antioxidant activities in terms of ABTS and DPPH were negatively correlated with Mn but positively correlated with bulb dry weight, h o , and lightness. The collective results indicate that onion bulb quality was highly aff ected by commercial onion packinghouses, thus glucose and fructose were highly associated with amino acids and bulb dry weight with most bulb physiological parameters. Therefore, the commercial storage facility may play a pivotal role in the fl uctuation of targeted major metabolites and mineral nutrients after long-term cold storage.
The Understanding of Internal Browning Incidence in Cold-stored Asian Pears
Hnin Phyu Lwin,Jinwook Lee 한국원예학회 2021 한국원예학회 학술발표요지 Vol.2021 No.10
After harvest or during cold storage and distribution period, Asian pear fruit are prone to develop the symptom of internal browning incidence. The symptoms of internal browning disorder are widely detected on cortex tissue, core tissue, or both tissues at the same time, and thus referred to as cortex browning, core browning, or flesh browning, respectively, depending on the location of internal browning. The incidence of internal browning could be detected after short-term international trade to Taiwan. Preharvest GA4+7 spraying treatment caused to enhance the incidence and severity of cortex and core browning during long-term cold storage. In addition, preharvest 1-MCP spraying treatment differently affected the incidence of internal browning, depending on Asian pear cultivars. Interestingly, postharvest 1-MCP fumigation treatment reduced the incidence and severity of cortex and core browning during shelf life period, however, not significantly affected during long-term cold storage. The incidence and severity of internal browning were differently affected by storage temperature during long-term cold storage. The lower storage temperature caused to reduce the incidence and severity of core browning but not cortex browning. The incidence and severity of cortex browning were significantly declined by the increase in the duration of pre-conditioning treatment during cold storage. However, metabolic mechanisms involved in internal browning development in Asian pears remain largely unknown. We therefore studied the relationship between cortex browning and targeted metabolites such as minerals, soluble carbohydrates, organic acids, free amino acids, phenolic compounds, fatty acids, and volatiles organic compounds (VOCs) in comparison to healthy, sound, and browning tissues of cold-stored ‘Wonhwang’ pear fruit. The levels of P, K, and Ca, sorbitol, shikimic acid, palmitic acid, stearic acid, and α-linoleic acid were lower in browning tissue than in healthy tissue. While the contents of glucose, fructose, malic acid, fumaric acid, total phenolics, total flavonoids, ABTS and DPPH radical scavenging activities, some amino acids (valine, isoleucine, leucine, tryptophan, phenylalanine, proline, and lysine), lignoceric acid, and ethyl esters, (E)-2-octenal, benzaldehyde, 2-petylfuran were higher in browning tissue, compared with other tissues. Overall, the results of this study suggest that internal browning involve different metabolic pathways and the comparative difference of targeted metabolites was appeared among damaged cortical tissues in cold-stored ‘Wonhwang’ pear.