KOREAN JOURNAL OF CROP SCIENCE (한국작물학회지)

The Korean Society of Crop Science (한국작물학회)
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Studies on the Temperature Response and Critical Day-length Affecting the Heading Date of Major Cultivating Rice Varieties in Recent Korean Paddy Field

농가재배 주요 벼 품종들의 출수에 영향을 미치는 온도 반응과 한계일장 구명 연구

  • Lee, HyeonSeok (Crop Cultivation & Physiology Research Division, National Institute of Crop Science, Rural Development Administration) ;
  • Hwang, WoonHa (Crop Cultivation & Physiology Research Division, National Institute of Crop Science, Rural Development Administration) ;
  • Jeong, JaeHyeok (Crop Cultivation & Physiology Research Division, National Institute of Crop Science, Rural Development Administration) ;
  • Yang, SeoYeong (Crop Cultivation & Physiology Research Division, National Institute of Crop Science, Rural Development Administration) ;
  • Lim, YeonHwa (Crop Cultivation & Physiology Research Division, National Institute of Crop Science, Rural Development Administration) ;
  • Choi, MyoungGoo (Crop Cultivation & Physiology Research Division, National Institute of Crop Science, Rural Development Administration) ;
  • Jeong, NamJin (Department of Crop Science and Biotechnology, Chonbuk National university) ;
  • Lee, ChungGen (Crop Cultivation & Physiology Research Division, National Institute of Crop Science, Rural Development Administration) ;
  • Choi, KyungJin (Crop Cultivation & Physiology Research Division, National Institute of Crop Science, Rural Development Administration)
  • 이현석 (농촌진흥청 국립식량과학원 작물재배생리과) ;
  • 황운하 (농촌진흥청 국립식량과학원 작물재배생리과) ;
  • 정재혁 (농촌진흥청 국립식량과학원 작물재배생리과) ;
  • 양서영 (농촌진흥청 국립식량과학원 작물재배생리과) ;
  • 임연화 (농촌진흥청 국립식량과학원 작물재배생리과) ;
  • 최명구 (농촌진흥청 국립식량과학원 작물재배생리과) ;
  • 정남진 (전북대학교 작물생명공학과) ;
  • 이충근 (농촌진흥청 국립식량과학원 작물재배생리과) ;
  • 최경진 (농촌진흥청 국립식량과학원 작물재배생리과)
  • Received : 2019.10.26
  • Accepted : 2019.11.30
  • Published : 2019.12.31
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Abstract

Rice is sensitive to day-length and short-day plants. It has a characteristic that the photosensitivity response required for flower bud differentiation decreases under long-day conditions. To identify critical photoperiod required for flower bud differentiation of major cultivation rice varieties, the average temperature was fixed at 28 ℃, and the day length was set at 12 hours and 10 minutes intervals from 13 hours to 14 hours 30 minutes. The critical photoperiod for each cultivar was set to day-length, where the daily cumulative response [(X(Critical Photoperiod)-Y(Set day-length))/(X(Critical Photoperiod)-12:00(Optimal Day-length)) × (28.0(Set Temperature)-10(Minimum Temperature))/(29.2(Maximum Temperature)-10(Minimum Temperature))] was the same for each day-length conditions. The flower bud differentiation time of all varieties was 32 days before heading at the average temperature of 28 ℃ conditions. The critical photoperiod of the early maturing type, such as Woonkwang, Odae, Koshihikari, Jopyeong, were 19:20, 18:14, 18:58, 17:30, respectively. Medium maturing type, such as Daebo, Haiami, Samdeok, were 16:08, 16:15, 16:55, respectively. Mid-late maturing type, such as Saenuri, Sindongjin, Chucheong, Samkwang, Ilpum, Saeilmi, Hwangkeumnuri, Dongjinchal, Ilmi, Hopum, Yeonghojinmi, were 15:58, 15:56, 16:36, 16:44, 15:35, 16:26, 15:33, 16:20, 16:29, 16:13, 15:41.

벼 주요재배 품종의 온도 및 일장에 따른 출수반응을 구명한 내용은 다음과 같다. 1. 온도에 따른 출수반응은 일장 12:00, 평균기온 22℃에서 28℃까지의 범위에서 1℃ 상승에 따라 평균 약 3.5일 정도 단축 되는 것을 확인하였으며, 온도가 상승 할수록 그 차이는 감소하는 경향을 보였다. 또한 온도에 따른 출수까지의 소요일수는 생태형별로 뚜렷한 차이를 보이지 못하였다. 2. 14:30과 12:00의 일장조건에 따른 출수까지의 소요일수 차이는 조생종 9.5일, 중생종 18.3일, 중만생종 23.5일로 온도반응과 달리 생태형간 뚜렷한 반응 차이를 보였으며, 일장조건이 짧아질수록 모든 생태형에서 일장반응에 따른 차이가 감소하는 것을 확인하였다. 3. 벼 주요 재배 품종의 화아분화 시점은 32일이었으며, 각 품종별 한계일장은 조생종인 운광, 오대, 고시히카리, 조평은 각각 19:20, 18:14, 18:58, 17:30이었다. 중생종인 대보, 하이아미, 삼덕은 각각 16:08, 16:15 및 16:55이었고, 중만생종인 새누리, 신동진, 추청, 삼광, 일품, 새일미, 황금누리, 동진찰, 일미, 호품, 영호진미는 각각 15:58, 15:56, 16:36, 16:44, 15:35, 16:26, 15:33, 16:20, 16:29, 16:13, 15:41이었다.

Keywords

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