RICE SCIENCE ›› 2008, Vol. 15 ›› Issue (3): 215-222 .

• Research Paper • Previous Articles     Next Articles

Responses of Yield Characteristics to High Temperature During Flowering Stage in Hybrid Rice Guodao 6

FU Guan-fu#; TAO Long-xing#; SONG Jian; WANG Xi; CAO Li-yong; CHENG Shi-hua   

  1. State Key Laboratory of Rice Biology, China National Rice Research Institute, Hangzhou 310006, China; #These authors contributed equally to this paper
  • Received:2008-03-18 Online:2008-09-28 Published:2008-09-28
  • Contact: CHENG Shi-hua
  • Supported by:
    the Agricultural Structure Reform Project of Ministry of Agriculture of China (Grant No. 06-03-01B), the China Super Hybrid Rice Research Project of Ministry of Agriculture of China, Span Plan Project for Agricultural Technology of Ministry of Agriculture of China (Grant No. 06-1); the Zhejiang Provincial Key Project, China (Grant No. 2008C22073); the National Agricultural Integrate Project of China (Grant No. 2006-27-2); and the Special Research Foundation for Institutes of China.

Abstract: 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.

Key words: hybrid rice, high temperature stress, high temperature injury, spikelet fertility, seed setting