We analyzed the anthocyanin accumulation, abscisic acid (ABA), gibberellic acid (GA) contents and metabolic genes expression in berry skins under high temperature (High T) at veraison, in order to investigate the cause of bad coloration of 'Kyoho' grape due to High T in summer season. The coloration of ‘Kyoho’ grapes was stopped by High T for 10 days from veraison, and the fruit quality was not affected except skin color. Total anthocyanin of skins was decreased by High T treatment and malvidin and peonidin were decreased compared to control. In berry skins, ABA content did not decrease by High T treatment, but it was rather higher than that of control. GA content was increased about two times compared to the control after 10 days of High T treatment, which caused decreased ratio of ABA/GA. Analysis of expression of anthocyanin biosynthetic genes showed that the early biosynthetic genes were not affected by High T and the expression of UFGT was decreased by temperature treatment. ABA biosynthetic gene expressions were not affected by High T and the expression of GA20ox1 and GA2ox1/2, which are known to regulate the biosynthesis and inactivation of GA, were increased and decreased by High T, respectively. Therefore, the bad coloration of ‘Kyoho’ grapes under the High T at veraison was due to inhibition of anthocyanin biosynthesis of skin, and it was suggested that the anthocyanin biosynthesis was controlled by the ratio of ABA and GA rather than ABA content.

Abstract
 서 론
 재료 및 방법
 결 과
  1. 과피의 착색 및 과실품질
  2. 식물호르몬 ABA 및 GA 함량
  3. 안토시아닌 생합성 유전자 발현
  4. ABA 및 GA 대사 관련 유전자 발현
 고 찰
  1. 변색기 고온에 의한 과피색 불량
  2. 안토시아닌 조성 및 생합성 변화
  3. 식물호르몬 농도 변화와 과피색 불량
 적 요
 Literature Cited

• 류수현(농촌진흥청 국립원예특작과학원 원예작물부 과수과) | Suhyun Ryu (Fruit Research Division, National Institute of Horticultural & Herbal Science, Rural Development Administration) Corresponding author
• 조정건(농촌진흥청 국립원예특작과학원 원예작물부 과수과) | Jung-Gun Cho (Fruit Research Division, National Institute of Horticultural & Herbal Science, Rural Development Administration)
• 정재훈(농촌진흥청 국립원예특작과학원 원예작물부 과수과) | Jae Hoon Jeong (Fruit Research Division, National Institute of Horticultural & Herbal Science, Rural Development Administration)
• 이슬기(농촌진흥청 국립원예특작과학원 원예작물부 과수과) | Seul-Ki Lee (Fruit Research Division, National Institute of Horticultural & Herbal Science, Rural Development Administration)
• 한점화(농촌진흥청 국립원예특작과학원 원예작물부 과수과) | Jeom Hwa Han (Fruit Research Division, National Institute of Horticultural & Herbal Science, Rural Development Administration)
• 김명수(농촌진흥청 국립원예특작과학원 원예작물부 과수과) | Myung-Su Kim (Fruit Research Division, National Institute of Horticultural & Herbal Science, Rural Development Administration)