Buckwheat (Fagopyrum esculentum), which is a traditional Korean crop, has been known as a health food due to its rich nutrition. This study was conducted to evaluate the change in flavonoid content of flowers and seeds during post-flowering growth of Korean tartary buckwheat variety ‘Hwanggeummiso’, with the aim of providing basic data for the development of functional food and feed additive. Tartary buckwheat took 69 and 99 days from the sowing date to reach the flowering and maturity stages, respectively. As a result of examining the flavonoid components of each part of tartary buckwheat, chlorogenic acid, rutin, and isoquercitrin of flowers increased from the flowering period on 22 May (0 days after flowering) to 42 days after flowering, while quercetin increased until 21 days after flowering and then decreased thereafter. In seeds, chlorogenic acid, rutin, and isoquercitrin were most abundant at the time of seed-bearing on 14 days after flowering, and showed a decreasing tendency thereafter. On the other hand, quercetin showed a tendency to increase until 21 days after flowering and then decrease. Overall, the flavonoid content was higher in flowers than in seeds, with rutin being particularly prominent. Based on this, the possibility as food materials and feed additives was confirmed using buckwheat produced in Korea.

Ⅰ. INTRODUCTION
Ⅱ. MATERIALS AND METHODS
    1. Cultivation and characterization of Tartary Buckwheat
    2. Extraction methods
    3. Sample preparation and analytical conditions forflavonoid content analysis
    4. Statistical analysis
Ⅲ. RESULTS AND DISCUSSION
    1. Growth characteristics of tartary buckwheat variety‘Hwanggeummiso’
    2. Comparison of Flavonoid Content in TartaryBuckwheat Seeds According to Extraction Methods
    3. Changes in flavonoid content in tartary buckwheatflowers and seeds after flowering
Ⅳ. CONCLUSIONS
Ⅴ. ACKNOWLEDGEMENTS

• Jun Young Ha(Department of Central Area Crop Science, National Institute of Crop Science, Rural Development Administration, Suwon 16429, Republic of Korea)
• Hyeong-Hwan Lee(Gyeongnam AntiAging Research Institute, Sancheong 52215, Republic of Korea)
• Dong Yeol Lee(Gyeongnam AntiAging Research Institute, Sancheong 52215, Republic of Korea)
• Won Min Jeong(Gyeongnam AntiAging Research Institute, Sancheong 52215, Republic of Korea)
• Dong Gyu Jeong(Gyeongnam AntiAging Research Institute, Sancheong 52215, Republic of Korea)
• Hwan Hee Bae(Department of Central Area Crop Science, National Institute of Crop Science, Rural Development Administration, Suwon 16429, Republic of Korea)
• Mi-Jin Chae(Department of Central Area Crop Science, National Institute of Crop Science, Rural Development Administration, Suwon 16429, Republic of Korea)
• Jinseok Lee(Department of Central Area Crop Science, National Institute of Crop Science, Rural Development Administration, Suwon 16429, Republic of Korea)
• Gun Ho Jung(Highland Agriculture Research Institute, National Institute of Crop Science, Rural Development Administration, Pyeongchang 25342, Republic of Korea) Corresponding author