Effects of sowing time limitation and total rutin contents of buckwheat in Korea

Buckwheat is one of the traditional Korean crops which gains global attention as a health food due to its rich nutrition. Recent extreme weather events caused by climate change such as flooding and drought reduced crop production. Though, buckwheat grows during the fall season in Korea, flooding is one of severe environmental stress factors for buckwheat. The accumulated temperature of buckwheat was 1,093˜1,515 °C from sowing to harvest and 564˜736 °Cfrom flowering to harvest, respectively. Plant height, stem diameter, and dry matter weight were reduced as sowing date was delayed. The growing period of 'Yangjeol1' for autumn season was approximately 55˜56 days. Total rutin content of the spring and the autumn buckwheat is 22.8 and 23.2 mg/100 g, respectively, showing no difference in rutin content between both cultivation seasons. Quercetin content of the autumn ones was about 2.14 mg/100 g and was higher by about 30% than that of the spring ones. These results suggested that autumn buckwheat has more quercetin than spring one unlike rutin.