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Nay Myo Win,Yang-Yik Song,Jong-Chul Nam,Young Sik Cho,Sang-Jin Yang,Jingi Yoo,In-Kyu Kang,Juhyeon Park 한국원예학회 2023 원예과학기술지 Vol.41 No.2
‘Hongro’ apple flowers were thinned with chemical (lime sulfur), low mechanical (200 rpm rotor speed, 4 km·h-1 tractor speed), high mechanical (300 rpm, 6 km·h-1), low mechanical (200 rpm, 4 km·h-1) + chemical, and high mechanical (300 rpm, 6 km·h-1) + chemical thinning treatments. Manual (hand) thinning served as a control. Most terminal and lateral flowers per cluster were removed by high mechanical thinning and the combination of this method with chemical thinning, compared to low mechanical thinning combined with chemical thinning. Additionally, the fruit set rate for both terminal and lateral flowers was mostly reduced when using the high mechanical + chemical thinning combination. However, a higher rotor speed during mechanical thinning increased the leaf damage rate compared to a lower rotor speed. Moreover, the high mechanical + chemical thinning combination improved flesh firmness, titratable acidity, and the soluble solid content in fruit at harvest compared to the control plants with low mechanical thinning combined with chemical thinning. The a* value (measured in fruit peel by CIE L* a* b* method) was highest when high mechanical thinning was used and lowest when chemical thinning was used. However, the fruit weight and size and the starch index were unaffected by all thinning treatments. Overall, the effects of mechanical thinning varied according to the rotor and tractor speed, and a high rotor speed (300 rpm) had a greater impact than a lower rotor speed (200 rpm). The highest thinning efficiency was achieved when using the high mechanical + chemical thinning combination, which improved the fruit quality of ‘Hongro’ apples.
Nay Myo Win,유진기,권중근,강인규 한국식품저장유통학회 2022 한국식품저장유통학회지 Vol.29 No.4
The effects of 1-methylcyclopropene (1-MCP) on the fruit quality and antioxidant activity of ruby-S apples were evaluated during cold storage. The fruits were treated with 0 (control) and 1 μL/L 1-MCP and stored at 0℃ for six months. The assessments were performed at 0 (harvest), 3, and 6 months of storage. Compared with the control, the 1-MCP-treated fruits exhibited a reduced internal ethylene concentration and slowed appearance of greasiness on the fruit skin. In addition, 1-MCP treatment helped maintain a reduction in flesh firmness, titratable acidity, and peel color attributes (L* and b*) of the fruit. However, 1-MCP treatment did not affect fruit weight loss, soluble solids content, or peel color a* value. The 1-MCP treatment helped delay the reduction in total phenolics (TPC) and total flavonoids (TFC) content as well as total antioxidant determined by 1,1-diphenyl-2-picrylhydrazyl (DPPH) radical scavenging activity (RSA) in the peel tissue. In the pulp tissue, 1-MCP affected only TPC, and not TFC or DPPH RSA. Overall, this study suggests that 1-MCP treatment helps maintain the desirable fruit quality attributes of ruby-S apples during ripening, but its effect on antioxidant activity depends on the tissue type (peel and pulp) of the fruit.
Nay Myo Win,Jinwook Lee,Jingi Yoo,Seulgi Ryu,Kyoung-ook Kim,Dae Hyun Kim,Hee-Young Jung,Myoung-Gun Choung,Kyeung-il Park,Young-Je Cho,In-Kyu Kang 한국원예학회 2018 원예과학기술지 Vol.36 No.2
This study was carried out over two consecutive years to evaluate the effects of polyethylene (PE) film liner, 1-methylcyclopropene (1-MCP), and aminoethoxyvinylglycine (AVG) treatments on fruit quality attributes of ‘Tonewase’ persimmon in cold storage. Fruit was harvested at two different levels of maturity, at a normal commercial harvest date in the first year and 10 days earlier in the second year. The PE film liner treatment significantly suppressed losses of fresh weight during cold storage, compared with the other treatments in both years. However, peel color variables (L*, a*, and b*) in the calyx-end regions declined when treated with the PE film liner, compared with the other treatments in both years. None of the treatments affected ethylene production and fruit decay was not detected during storage between the treatments. The highest level of fruit softening was observed in persimmon fruit treated with the PE film liner, while the softening rate in the other treatments was less than 50% at the end of cold storage. Fruits in all treatments were unmarketable after 2 months of storage. For the persimmon fruit harvested at the normal harvest date, the treatment with 1-MCP resulted in the highest average respiration rate and the lowest soluble solids content (SSC), compared with fruit in the other treatments. For the persimmon fruit harvested at the early harvest date, flesh firmness of fruit treated with the PE film liner declined significantly, but less so than for fruit in the other treatments by the end of storage, whereas the SSC and respiration rate were not affected by any of the treatments during cold storage. The PE film liner significantly reduced fresh weight loss during cold storage and flesh firmness and peel color were significantly affected by this treatment in second year. Overall, the results suggested that fruit harvest time in terms of fruit maturity and PE film liner treatment would retain greater fruit quality attributes during storage.
NAY MYO WIN,유진기,류슬기,이진욱,정희영,정명근,박경일,조영제,강상재,강인규 한국식품저장유통학회 2017 한국식품저장유통학회지 Vol.24 No.7
This study was aimed to test harvest time effect with polyethylene (PE) film liner, 1-methylcyclopropene (1-MCP) and aminoethoxyvinylglycine (AVG) treatments on fruit quality attributes in ‘Sangjudungsi’ persimmon fruit during cold storage. The fruits were harvested 10 days earlier in 2016 than the mature harvest time in 2015. The ethylene production was significantly lower in early harvested fruits than in mature harvested ones. Flesh firmness was maintained higher in 1-MCP treated fruit than in other treatments during cold storage. The rate of fruit weight loss was significantly inhibited by PE film liner treatment during storage, regardless of harvest time. 1-MCP treatment showed less change in fruit peel color variables (L* and b*) from the calyx-end and equatorial regions during cold storage, compared with those from the control and PE film treatments. The incidence rate of fruit decay and softening was higher in PE film treated fruits than in the other treatments. However, there was no decay detected in AVG treated fruit. The early harvested fruits were maintained higher flesh firmness, compared with mature harvested fruits. Nevertheless, the mature harvested fruits showed much higher soluble solids content, the redness (Hunter a value) of the fruit peel and respiration rate, compared with early harvested fruits. Furthermore, the rate of weight loss in the fruit was remarkably inhibited in the PE film treatment.
Nay Myo Win,Dongyong Lee,Juhyeon Park,Yang-Yik Song,Young Sik Cho,Youngsuk Lee,Moo-Yong Park,Hun Joong Kweon,In-Kyu Kang,Jong-Chul Nam 한국원예학회 2022 원예과학기술지 Vol.40 No.3
Bloom thinning is an important practice that influences the profitability of the orchard. Hence, we assessed the effect of chemical bloom thinning on thinning efficiency and fruit quality of ‘RubyS’ apples. Lime sulfur was applied as a bloom thinning agent at 1, 1 + 3, and 2 + 4 days after full bloom (DAFB), and non-bloom thinning trees were used as controls. Compared to the control and bloom thinning treatments at 1 DAFB and 2 + 4 DAFB, the application of bloom thinning at 1 + 3 DAFB greatly decreased the number of fruits per cluster in both terminal and lateral flowers. Although the application of bloom thinning at 2 + 4 DAFB decreased the number of fruits per cluster in the terminal flower, it did not affect the number of fruits per cluster in the lateral flower when compared to the control. At harvest, the number of fruits per tree (fruits/ tree) and yield (kg/ tree) was significantly higher in control trees than in bloom-thinned trees. However, fruit quality attributes including fruit weight and size, flesh firmness, soluble solids content, area of red-blushed surface, and a* value in the fruit were significantly improved by bloom thinning at 1 + 3 DAFB. Therefore, this study suggested that applying bloom thinning at 1 + 3 DAFB could serve as an effective thinning treatment to manage crop load in trees and improve the quality of ‘RubyS’ apple fruits.