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Sang Yong Nam

Leaf lettuce is a major and widely cultivated vegetable crop. Leaf lettuce is preferred for wrapping food, like rice or meat, and is much more popular than head lettuce in Korea. Color change and water loss condition are most important factor for buying decision as external quality. This paper studied color change during storage at 20 and 4 °C, 60% RH. The color analysis of adaxial surface of leaf lettuce during shelf-life storage condition showed that Hunter L and a value increased slightly after 5 days of harvest, while delta-Eab started increasing after 3 days of postharvest. Chlorophyll content decreased by half during the first 5 days after harvest. These color changes, however, could not explain the changes in leaf chlorophyll content while the color intensity of G (green) component in RGB analysis showed a close relationship with leaf chlorophyll content changes. Visual quality score showed that lettuce may kept its marketability up to 5 days after harvest. But, in refrigerator (4°C, 60% RH, cold chain system) storage condition. Leaf color is about three times longer than shelf-life. Theses results of each evaluation methods consistently demonstrated that leaf lettuce may keep its marketability up to 5 days in a distribution market without color quality damage.

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Ji Hae Jun, Jung Hyun Kwon, Eun Young Nam, Kyeong Ho Chung, Ik Koo Yun, Seok Kyu Yun, Yong Bum Kwack, Sung Jong Kim, and Sang Jo Kang

‘Yumi’ is the eighth peach cultivar released by the Rural Development Administration (RDA) peach breeding program since 1962. The main purpose of this program is to breed new peach cultivars that can satisfy consumers with high fruit quality. This program has focused on sweet and good tasting fruit with long shelf life. ‘Yumyeong’ has good shelf life with firm flesh (Kim et al., 1978) and ‘Chiyomaru’ produces good-tasting and early ripening fruit (Yamaguchi et al., 1989). In the 1990s, these two cultivars were chosen as parents to breed new peach cultivars bearing high-quality fruit. The cross

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Ji Hae Jun, Jung Hyun Kwon, Eun Young Nam, Kyeong Ho Chung, Ik Koo Yun, Seok Kyu Yun, Yong Bum Kwack, Sung Jong Kim, and Sang Jo Kang

‘Hahong’ is a new nectarine cultivar from the Rural Development Administration’s National Institute of Horticultural & Herbal Science breeding program, which has been in operation since 1962. ‘Hahong’ is a midseason nectarine that produces large, attractive, and yellow sweet fruit for the fresh market. The cultivar should be widely adapted to wherever peaches and nectarines are grown to provide growers with an alternative to ‘SunGlo’ that has superior fruit quality, particularly in terms of fruit size and sweetness. In 2009, Plant Variety Protection rights were granted in the Republic of Korea.

Origin

The ‘Hahong’ nectarine [Prunus persica (Batsch)