Journal
RICE SCIENCE
Volume 15, Issue 3, Pages 215-222Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/S1672-6308(08)60045-1
Keywords
hybrid rice; high temperature stress; high temperature injury; spikelet fertility; seed setting
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Funding
- Agricultural Structure Reform Project of Ministry of Agriculture of China [06-03-01B]
- China Super Hybrid Rice Research Project of Ministry of Agriculture of China, Span Plan Project for Agricultural Technology of Ministry of Agriculture of China [06-1]
- Zhejiang Provincial Key Project, China [2008C22073]
- National Agricultural Integrate Project of China [2006-27-2]
- Special Research Foundation for Institutes of China
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By sowing at different dates during 2005 and 2006 both in paddy fields and greenhouse, a super hybrid rice combination Guodao 6 and a conventional hybrid rice combination Xieyou 46 (as control) were used to analyze the differences in heat injury index, seed setting rate, grain yield and its components. Guodao 6 showed more stable yield and spikelet fertility, and lower heat injury index than Xieyou 46. Further studies indicated that the spikelet sterility is positively correlated with the average daily temperature and the maximum daily temperature, with the coefficients of 0.8604 and 0.9850 (P < 0.05) respectively in Guodao 6. The effect of high temperature injury on seed setting caused by maximum daily temperature was lower than that by average daily temperature during the grain filling stage.
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