Effect of cold storage and 1-methylcyclopropene treatment on fruit storage potential of ‘Summer Prince’ and ‘Summer King’ apples

Abstract

The purpose of this study was to investigate the effects of cold storage and 1-methylcyclopropene (1-MCP) treatment on fruit quality and storage potential of 'Summer Prince' and 'Summer King' apples. The fruits were treated with 1-MCP at a concentration of 1 μL/L for 18 h immediately after harvest, and stored for up to 6 months under cold storage (0℃). The fruit quality during cold storage showed that the loss of flesh firmness of untreated fruits was remained at 70 N for 'Summer Prince' apple up to 4 months and 60 N for 'Summer King' apple up to 2 months, and reduced down than those results after that. In 1-MCP treatment, both cultivars maintained flesh firmness over 70N even after 6 months of storage. Titratable acidity of untreated fruits decreased to 0.32% ('Summer Prince') and 0.31% ('Summer King') for up to 3 months, but 1-MCP-treated fruits still remained at 0.33% and 0.30% for up to 4 months of storage. Internal ethylene concentration (IEC) of untreated fruits was increased after one month in both cultivars, but IEC of 1-MCP-treated fruits was significantly lower than that of untreated fruits. Skin greasiness did not occur at all. Fruit weight loss and peel color variables (L*, a*, b*) tended to a little increase during cold storage. In case of 'Summer Prince' apples, 1-MCP-treated fruits exhibited a reduced weight loss and delayed change in redness (a*). Therefore, this study suggested that the storage potential of 'Summer Prince' and 'Summer King' apples at cold storage was estimated at 3 and 2 months, respectively, but this potential would increase for up to 4 months with 1-MCP treatment in both cultivars.

Fruit Quality and Antioxidant Activities of Yellow-Skinned Apple Cultivars Coated with Natural Sucrose Monoesters

“…The respiration rates increased for all the fruits from 14 to 28 DAS, which was mostly associated with increasing internal ethylene concentrations accelerating the ripening process [12,26]. Similar results have been reported in other studies that 'Tsugaru' and 'Summer King' apples treated with 1-MCP in the pre-climacteric significantly disrupted production of ethylene and respiration rates at 20 • C for four weeks [6,27].…”

“…Recent global warming would have led to a higher production of yellowskinned apples with accumulation of carotenoid pigments than of the red-color cultivars of the anthocyanin present in the skin required in low temperature conditions during harvest time [1,4]. 'Tsugaru', 'Summer King', and 'Shinano Gold' apples, a late-ripening cultivar, all have a distinctive smooth yellow-skin without need for red pigmentation but climacteric fruits associated with rapid increases in internal ethylene concentrations and respiration rates [5,6]. This has lead to the fast metabolism and fruit senescence and has been major concern toward those apple fruits.…”

“…Softening of 'Summer King' apples rapidly advanced between 10 and 15 days after harvest, reducing the primary parameter of internal fruit quality [5,6]. A large supply and bulk shipment of early-ripening apples often leaves fruit susceptible to mishandling through the lack of a suitable post-harvest treatment and leads to large quantities of fruit spoiling (more than 40%) during storage and processing in developing countries, from reductions in fruit metabolic rate and increased storage disorders [1,7,8].…”

Functional Properties of Newly Bred ‘Summer Prince’ Apples

“…(Summer King, 교배조합; 모본 : '후지' × 부본 : '골든 데리셔스')' 등의 품종이 다양하게 육종되었다(Yoo and Kang, 2020).신육성품종 중 '썸머프린스' 사과는 붉은색 사과와 차별화를 가진 틈새시장형 녹황색 사과 품종이며, 과실 특성으로 수확기는 7월 하순, 과중은 234g, 당도는 11.3%, 산도는 0.55%으로 맛과 품질이 우수한 것으로 평가되고 있다(Ban et al, 2014;Yoo et al, 2016).최근 자연친화적으로 식물 및 미생물로부터 분리된 다양한 활성성분들 가운데 체내의 생리활성기능 조절이나 이러한 효능에 대한 항상성 유지에 관련된 개발 가능한 기능성 소재를 찾는 선행조사들이 수행되고 있으며(Shin et al, 2003;Jeong et al, 2008), 사과에 함유된 기능성 연구가 활발히 진행되어 보고되고 있다. 현재 알려진 바에 의하면 사과의 과육과 껍질에는 폴리페놀 화합물, flavonoid와 같은 생리활성물질들(procyanidin, chlorogenic acid, caffeic acid, epicatechin, catechin, p-coumaroyl qunic acid, rutin, phloridzin, quercetin, phloretin 배당체 등)이 다량 함유되어 있어 내인성, 외인성 노화 또는 스트레스와 외부자극에 의한 산화적 손상으로 인한 피부노화, 주름유발, 염증 등과 같은 질병에 대한 억제와 예방에 밀접한 관 련이 있다…”