Impacts of nighttime post-anthesis warming on rice productivity and grain quality in East China
Wenjun Dong ,
Jin Chen ,
Lili Wang ,
Yunlu Tian ,
Bin Zhang ,
Yongcai Lai ,
Ying Meng,
Chunrong Qian,
Jia Guo
Affiliations
Wenjun Dong
Institute of Farming and Cultivation, Heilongjiang Academy of Agricultural Sciences, Harbin 150086, China;Institute of Applied Ecology, Nanjing A\gricultural University, Nanjing 210095, China
Jin Chen
Institute of Applied Ecology, Nanjing A\gricultural University, Nanjing 210095, China
Lili Wang
Institute of Applied Ecology, Nanjing A\gricultural University, Nanjing 210095, China
Yunlu Tian
Institute of Applied Ecology, Nanjing A\gricultural University, Nanjing 210095, China
Bin Zhang
Institute of Applied Ecology, Nanjing A\gricultural University, Nanjing 210095, China
Yongcai Lai
Institute of Farming and Cultivation, Heilongjiang Academy of Agricultural Sciences, Harbin 150086, China
Ying Meng
Institute of Farming and Cultivation, Heilongjiang Academy of Agricultural Sciences, Harbin 150086, China
Chunrong Qian
Institute of Farming and Cultivation, Heilongjiang Academy of Agricultural Sciences, Harbin 150086, China
Jia Guo
Institute of Wetland Research, Chinese Academy of Forestry, Beijing 100091, China
The impacts of nighttime post-anthesis warming on rice productivity and grain quality in East China were evaluated for two cultivars, II You 128, an indica rice, and Wuyunjing 7, a japonica rice. Warming by 3.0 °C stimulated the nighttime respiration rate and decreased the photosynthesis rate, resulting in significant decreases of 21.2% and 24.9% in aboveground biomass accumulation for II You 128 and Wuyunjing 7, respectively. Warming significantly reduced the rates of seed setting and grain filling, especially of inferior kernels (those lower in panicles), while the filling rate of superior kernels remained almost unchanged. As a result, 1000-grain weight and grain yield were respectively 3.7% and 30.0% lower for II You 128 and 12.8% and 34.3% for Wuyunjing 7 in warmed plots than in the unwarmed control. Nighttime warming also significantly reduced the grain milling and appearance quality of both varieties. More negative effects of warming on inferior than on superior kernels were found. The above results have important implications for rice variety cultivation in East China.
