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

• Published in: Rice science Vol. 15; no. 3; pp. 215 - 222
• Main Authors: FU, Guan-fu, TAO, Long-xing, SONG, Jian, WANG, Xi, CAO, Li-yong, CHENG, Shi-hua
• Format: Journal Article
• Language: English
• Published: Elsevier B.V 01.09.2008; These authors contributed equally to this paper%State Key Laboratory of Rice Biology,China National Rice Research Institute,Hangzhou 310006,China; State Key Laboratory of Rice Biology,China National Rice Research Institute,Hangzhou 310006,China
• Subjects: high temperature injury; high temperature stress; hybrid rice; seed setting; spikelet fertility; 损伤程度; 杂交水稻; 种子处理; 高温高压; seed setting; high temperature stress; spikelet fertility; hybrid rice; high temperature injury
• ISSN: 1672-6308; 1876-4762
• DOI: 10.1016/S1672-6308(08)60045-1

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.