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2020 Vol.65, Issue 1 Preview Page

Original Research Article

Impact of Heat Stress on Pollen Fertility Rate at the Flowering Stage in Korean Rice (Oryza sativa L.) Cultivars
Tran Loc Thuy1
,
Chung-Kuen Lee2
,
Jae-Hyeok Jeong3
,
Hyeon-Suk Lee3
,
Seo-Young Yang3
,
Yeon-Hwa Im3
,
Woon-Ha Hwang3*
1Scientist, Rice Division, Cuu Long Delta Rice Research Institute, Can Tho PO BOX 1509, Vietnam
2Senior Scientist, Crop Production & Physiology Division, Nation Institute of Crop Science, Jeon-ju 55365, Republic of Korea
3Junior Scientist, Crop Production & Physiology Division, Nation Institute of Crop Science, Jeon-ju 55365, Republic of Korea
*Corresponding Author
1 March 2020. pp. 22-29
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Abstract

Rice is very sensitive to high temperatures during the reproductive stage, particularly during the flowering and anthesis periods. To determine how high temperatures result in sterility during the flowering period in Korean rice cultivars, groups of 11 cultivars were subjected to different temperature regimes (24, 28, 30, and 33°C) during the flowering stage using sunlit phytotrons. At an average of 33°C, all 11 rice cultivars reached anthesis earlier than at the other temperatures. Microscopy analyses revealed significant differences in pollen germination and pollen viability in cultivars grown at 33°C compared to those cultured at lower temperatures. At 33°C, the cultivars had significantly lower fertility rates (47% reduction) than cultivars grown at 24°C. These findings are important as rice pollination and fertility depend on the pollen viability and germination. The present study shows that rice fertility is negatively affected by excessively high temperatures.

Keywords
high temperature
pollen germination
pollen viability and spikelet fertility
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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 : 65
  • No :1
  • Pages :22-29
  • Received Date : 2019-11-06
  • Revised Date : 2020-01-13
  • Accepted Date : 2020-01-29
  • DOI :https://doi.org/10.7740/kjcs.2020.65.1.022
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