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2023 Vol.68, Issue 4
Critical Temperature for Grain Filling of Japonica Rice in Korea

우리나라 자포니카 벼 품종의 등숙 한계온도 분석

Woonho Yang1*
,
Shingu Kang2
,
Dae-Woo Lee2
,
Mi-jin Chae2
양 운호1*
,
강 신구2
,
이 대우2
,
채 미진2
1Senior Research Scientist, Crop Cultivation & Environment Research Division, Department of Central Area Crop Science, National Institute of Crop Science, Rural Development Administration, Suwon 16429, Korea
2Research Scientist, Crop Cultivation & Environment Research Division, Department of Central Area Crop Science, National Institute of Crop Science, Rural Development Administration, Suwon 16429, Korea
1농촌진흥청 국립식량과학원 중부작물부 재배환경과 농업연구관
2농촌진흥청 국립식량과학원 중부작물부 재배환경과 농업연구사
*Corresponding Author
1 December 2023. pp. 225-235
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Abstract

Critical temperature for grain filling of three Korean japonica rice varieties was analyzed by late transplantation to induce a low temperature during grain filling period in a field study. The grain filling percentage (GFP) and grain dry weight (GDW) showed a sigmoid development for the first and second transplants in 2020 and first to third transplants in 2021. For the third transplant in 2020 and fourth transplant in 2021, the GFP and GDW reached a peak at 42 days after heading (DAH), and then decreased or remained unchanged. In non-linear regression analyses, 95% of the final GFP and GDW appeared at 49 - 62 DAH for the second transplant in 2020 and at 37 - 46 DAH and 30 - 36 DAH for the second and third transplants in 2021, respectively. At these time points, the critical seven-day moving temperature (7dMovT) was 8.4~9.4℃ for the second transplant in 2020 and 9.4~10.9℃ for the second and third transplants in 2021, depending on the grain filling traits and varieties of rice. The lowest 7dMovT was 8.4 - 8.7℃ in the three varieties. The observed lowest 7-day mean temperature (7dMT) accompanying increases in the GFP and GDW was 9.4 - 10.1℃, depending on the varieties in the third transplant of 2020 and fourth transplant of 2021. In the two transplants mentioned above, the highest 7dMT that showed no increase or decrease in grain filling traits was 8.7 - 9.1℃. The critical temperature for grain filling of japonica rice was 8.4 - 8.7℃ based on the 7dMovT and 9.1 - 9.4℃ based on the 7dMT. The previous 7dMT of 10℃ is recommended to determine the marginal harvest time for safe rice cropping since the temperature was the highest among the lowest temperature that accompanied an increase in grain filling traits.

Keywords
critical temperature
grain filling
rice
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Information
  • Publisher :The Korean Society of Crop Science
  • Publisher(Ko) :한국작물학회
  • Journal Title :The Korean Journal of Crop Science
  • Journal Title(Ko) :한국작물학회지
  • Volume : 68
  • No :4
  • Pages :225-235
  • Received Date : 2023-08-11
  • Revised Date : 2023-09-09
  • Accepted Date : 2023-09-12
  • DOI :https://doi.org/10.7740/kjcs.2023.68.4.225
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