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2019 ASHS Annual Conference

Comparative Fruit Performance and Major Metabolic Responses of Two Summer Apples during Cold Storage

Thursday, July 25, 2019
Cohiba 5-11 (Tropicana Las Vegas)
Seungyeon Han, Chung-Ang University, Department of Integrative Plant Science, Anseong, Korea, Republic of (South)
Hnin Phyu Lwin, Chung-Ang University, Department of Integrative Plant Science, Anseong, Korea, Republic of (South)
Soon-Il Kwon, National Institute of Horticultural and Herbal Science, Apple Research Institute, Gunwi, Korea, Republic of (South)
In-Kyu Kang, Kyungpook National University, Department of Horticultural Science, Daegu, Korea, Republic of (South)
Young-Je Cho, Kyungpook National University, School of Food Science and Biotechnology, Daegu, Korea, Republic of (South)
Jinwook Lee, Chung-Ang University, Department of Plant Science and Technology, Anseong, Korea, Republic of (South)
As extremely early season apples, ‘Summer King’ and ‘Summer Prince’ cultivars are harvested at the end of July and thus their popularity is increasing. The objective of this study was to evaluate the comparative responses of fruit quality attributes and major metabolites in these two summer apple cultivars stored at 1oC for up to 3 months. Fresh weight loss was higher but soluble solids content was lower in ‘Summer Prince’ than in ‘Summer King’ apples. Flesh firmness was relatively stable in ‘Summer Prince’ but decreased significantly in ‘Summer King’ apples during the second half of cold storage. Although hue angle gradually declined regardless of cultivar and tissue type, it was higher in ‘Summer King’ than in ‘Summer Prince’ apples during cold storage. While sucrose level was higher, fructose and sorbitol contents were lower in ‘Summer Prince’ than in ‘Summer King’. Three major organic acids were higher in ‘Summer King’ than in ‘Summer Prince’ apples. Aspartic acid, glutamic acid, arginine, alanine, GABA, tyrosine and leucine were higher in ‘Summer Prince’ than in ‘Summer King’ apples but serine, histidine, methionine, trytophane, phenylalanine, and isoleucine were lower during cold storage. Furthermore, the incidence of lenticel blotch was higher in ‘Summer Prince’, compared to ‘Summer King’ apples. Overall, the results indicated that physiological performance and metabolic alteration of these two summer apples differed during cold storage. Financial support for this research was provided by a grant through the 2018 Research Fund (PJ012455052019) of Rural Development Administration, Republic of Korea.
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