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《Chinese Journal of Rice Science》 2013-01
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Responses of Rice Growth and Grain Yield to Nighttime Warming in Northeast China

CHEN Jin1,TIAN Yun-lu1,DONG Wen-jun1,HOU Li-gang2,MA Wei2,XU Zhi-yu3,ZHANG Wei-jian1,4,(1Institute of Applied Ecology,Nanjing Agricultural University,Nanjing 210095,China;2 Rice Research Institute,Academy of Agricultural Sciences of Jilin Province,Gongzhuling 136100,China;3 College of Agronomy and Biotechnology,China Agricultural University,Beijing 100193,China;4 Institute of Crop Sciences,Chinese Academy of Agricultural Sciences/Key Laboratory of Crop Physiology and Ecology,Ministry of Agriculture,Beijing 100081,China)  
To learn the actual responses of rice growth to warming,especially nighttime warming in Northeast China will benefit the strategy decision making for food security in China.By using two field warming methods,a four-year experiment was conducted to investigate actual rice responses to nighttime warming for an entire growth cycle in Gongzhuling County,Jilin Province,China.The results showed that nighttime warming of 0.7-1.0℃ on rice canopy could advance rice initial flowering date by two to three days,but the grain filling stage was prolonged slightly by one to two days.There was no significant impacts of warming on rice net photosynthetic rate,but nighttime warming significantly increased the flag leaf area,the total green leaf area and the leaf area index(LAI) during post-flowering phase.Compared to the un-warmed control,the LAI of Jijing 81 and Jijing 83 significantly increased by 40.0% and 45.5%,respectively.Nighttime warming tended to enhance rice aboveground biomass and grain yield by 10%,and significantly increased the numbers of productive panicle and spikelet per panicle by 7.0% and 5.7%,respectively.It indicate that nighttime warming may benefit rice production through mitigating the low temperature limitation to rice growth in Northeast China.
【Fund】: 中央级公益性科研院所基本科研业务费专项;; 国家科技支撑计划资助项目(2011BAD16B14);; 国家973计划资助项目(2010CB951501);; 新世纪优秀人才资助计划资助项目(NCET-05-0492)
【CateGory Index】: S511
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