Agrotechnology

Quality characteristics of sweet potato varieties according to storage conditions

13^th International Conference on Agriculture & Horticulture

September 10-12, 2018 | Zurich, Switzerland

Gyeong Dan Yu, Hyeong Un Lee, Jung Wook Yang, Seungyong Lee, San Ko, Sang Sik Nam and Kyeong Bo Lee

National Institute of Crop Science – RDA, South Korea

Posters & Accepted Abstracts: Agrotechnology

Abstract:

Sweet potato (Ipomoea batatas L.) is one of the important food crops and is widely cultivated around the world. However, the quality of sweet potato decreased due to the decay and incorrect handling practices after harvest. Curing and storage temperature of sweet potato storage roots has been recognized as one of the most effective ways of reducing the risk of postharvest infection and decay. In the present study, we investigated the difference of storability and quality in sweet potato varieties according to curing treatment, storage temperature and storage period. The materials were four varieties that dry type ('Daeyumi', 'Jinhongmi'), medium moist type ('Pungwonmi'), and moist type ('Hogammi'). Tuberous roots were stored in temperature (10±1, 13±1?C), humidity (90±3%) during 28 weeks after curing and non-curing treatment. During the storage period, root decay rate in all cultivars was lowered in the curing treatment than non-curing treatment. In addition, storage temperature showed a higher decay rate in 10?C than 13?C. These results suggested that curing method and storage temperature are important factors to store sweet potato for a longtime safely. The dry matter content at postharvest were higher ???Daeyumi??? and ???Hogammi??? by more than 30%, and ???Pungwonmi??? was lower by 26~27%, and all varieties decreased during the storage period. There was no clear tendency to change the hardness according to the curing and the storage temperature treatment and the tendency of the storage of the sweet potato hardness in all varieties tended to decrease at the later stage of storage rather than at the initial stage. As the storage period of 'Hogammi' and 'Pungwonmi' was longer, the sugar content increased. Especially, the sugar content was the highest in the 10?C treatment. These results will be useful as a basic data for better storage condition of sweet potato. Recent Publications: 1. Van Oirschot Q E A (2006) Sweet potato cultivars differ in efficiency of wound healing. Postharvest Biol. Technol. 42:65-74. 2. Song J H, Kim S K and Chun C H (2011) Application of simplified curing unit for the extension of storage life and improvement of physicochemical quality of sweet potatoes during long-term storage. J Bio Environ Cont, 20, 304-310. 3. Rees D, Van Oirschot Q E A and Aked J (2008) The role of carbohydrates in wound-healing of sweet potato roots at low humidity. Postharvest Biol Technol, 50, 79-86. 4. Tomlilns K I, Ndunguru G T and Rwiza E (2002) Influence of pre-harvest curing and mechanical injury on the quality and shelf-life of sweet potato(Ipomoea batatas (L.) Lam) in east Africa. J. Hortic. Sci. Biotech. 77(4):399-403. 5. Zhitian Z, Christopher C W and Harold C (2002) Biochemical changes during storage of sweet potato roots differing in dry matter content. Postharvest Biology and Technology. 24(3):317-325.

Biography :

Gyeong Dan Yu majored in Agriculture Biotechnology and has studied haploid breeding of Miscanthus, bioenergy crop (2012 to 2015). She is currently working at National Institute of Crop Science of Rural Development Administration in Republic of South Korea since 2012. Her research is about post-harvest management and has been working to reduce the economic losses of sweet potato cultivating farmers caused by post-harvest management problems. She is also interested in clarifying mechanisms related to changes of components in sweet potato during storage.

E-mail: gyeongdan@korea.kr