KOREAN JOURNAL OF CROP SCIENCE (한국작물학회지)

The Korean Society of Crop Science (한국작물학회)
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Investigation of Changes in Grain Quality and Physicochemical Properties of Rice According to the Temperature during the Ripening Stage and Preharvest Sprouting

벼 등숙기 기온 및 수발아가 종실 품질 및 이화학적 특성에 미치는 영향

  • Lee, HyeonSeok (Crop Cultivation & Physiology Research Division, National Institute of Crop Science, Rural Development Administration) ;
  • Lee, YunHo (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) ;
  • Lee, ChungGen (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)
  • 이현석 (농촌진흥청 국립식량과학원 작물재배생리과) ;
  • 이윤호 (농촌진흥청 국립식량과학원 작물재배생리과) ;
  • 황운하 (농촌진흥청 국립식량과학원 작물재배생리과) ;
  • 정재혁 (농촌진흥청 국립식량과학원 작물재배생리과) ;
  • 양서영 (농촌진흥청 국립식량과학원 작물재배생리과) ;
  • 이충근 (농촌진흥청 국립식량과학원 작물재배생리과) ;
  • 최명구 (농촌진흥청 국립식량과학원 작물재배생리과)
  • Received : 2020.08.21
  • Accepted : 2020.09.12
  • Published : 2020.12.01
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Abstract

Studies on the occurrence of rice preharvest sprouting (PHS) have primarily focused on temperature and rainfall duration at the time of PHS induction, but average temperature during grain filling can have a great influence on PHS. This study analyzed the effect of average temperature during grain filling on PHS occurrence and subsequent changes in grain quality after PHS. For two consecutive years, average temperature differences during grain filling were produced by varying the transplanting date. Artificial rainfall was treated under identical accumulated temperatures of 1200℃ after heading. It was confirmed that the occurrence of PHS was higher under high average temperature conditions during grain filling. In addition, the degree of grain quality reduction caused by PHS occurred more severely under high temperature conditions during grain filling. In order to reduce the risk of PHS occurrence and subsequent quality damage, it is important to control the planting date to avoid high-temperature conditions during grain filling.

등숙기간 동안의 온도에 따라서 동일한 출수 후 일수가 경과하더라도 출수 후 적산온도가 달라져 종실의 등숙단계가 달라지기 때문에 수발아에 영향을 줄 수 있는 종실의 특성이 달라지게 된다. 그렇기 때문에 수발아 검정을 위한 처리 시점은 출수 후 일수가 아닌 출수 후 특정 적산온도에 조건을 맞춰 시험을 진행해야 한다. 한편 수발아 발생은 등숙기간 동안의 온도에 따라서 크게 달라진다. 이에 따라서 발생하는 전분립의 구조, 전분함량 및 ABA함량의 변이 등은 수발아 발생에 영향을 줄 것으로 생각되며, 특히 고온등숙 시 수발아 발생율의 증가와 종실 전분립의 구조, 유리당 함량 등 종실 이화학적 특성 변이와의 관계에 대한 추가적인 검토가 필요할 것으로 생각된다. 또한 고온등숙시 수발아 발생율이 증가하기 때문에 등숙기 고온에 노출되지 않도록 이앙시기를 조절하여 수발아 발생위험을 감소시켜야 한다.

Keywords

References

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