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Effect of elevated CO2 on potassium absorption and utilization in different rice varieties
Received:August 20, 2020  
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KeyWord:elevated CO2 concentration;rice;types of varieties;grain yield;potassium absorption;potassium utilization
Author NameAffiliationE-mail
ZHOU Juan Key Laboratory of Crop Genetics and Physiology of Jiangsu Province/Key Laboratory of Crop Physiology, Ecology and Cultivation in Middle and Low Reaches of Yangtze River of Ministry of Agriculture/Co-Innovation Center for Modern Production Technology of Grain Crops, Yangzhou University, Yangzhou 225009, China  
SHU Xiao-wei Key Laboratory of Crop Genetics and Physiology of Jiangsu Province/Key Laboratory of Crop Physiology, Ecology and Cultivation in Middle and Low Reaches of Yangtze River of Ministry of Agriculture/Co-Innovation Center for Modern Production Technology of Grain Crops, Yangzhou University, Yangzhou 225009, China  
XU Gao-ping Key Laboratory of Crop Genetics and Physiology of Jiangsu Province/Key Laboratory of Crop Physiology, Ecology and Cultivation in Middle and Low Reaches of Yangtze River of Ministry of Agriculture/Co-Innovation Center for Modern Production Technology of Grain Crops, Yangzhou University, Yangzhou 225009, China
Crop Research Institute of Tianjin Academy of Agricultural Sciences, Tianjin 300112, China 
 
LAI Shang-kun Key Laboratory of Crop Genetics and Physiology of Jiangsu Province/Key Laboratory of Crop Physiology, Ecology and Cultivation in Middle and Low Reaches of Yangtze River of Ministry of Agriculture/Co-Innovation Center for Modern Production Technology of Grain Crops, Yangzhou University, Yangzhou 225009, China
Suqian Institute of Agricultural Sciences, Jiangsu Academy of Agricultural Sciences, Suqian 223800, China 
 
YANG Lian-xin Key Laboratory of Crop Genetics and Physiology of Jiangsu Province/Key Laboratory of Crop Physiology, Ecology and Cultivation in Middle and Low Reaches of Yangtze River of Ministry of Agriculture/Co-Innovation Center for Modern Production Technology of Grain Crops, Yangzhou University, Yangzhou 225009, China  
DONG Gui-chun Key Laboratory of Crop Genetics and Physiology of Jiangsu Province/Key Laboratory of Crop Physiology, Ecology and Cultivation in Middle and Low Reaches of Yangtze River of Ministry of Agriculture/Co-Innovation Center for Modern Production Technology of Grain Crops, Yangzhou University, Yangzhou 225009, China  
WANG Yu-long Key Laboratory of Crop Genetics and Physiology of Jiangsu Province/Key Laboratory of Crop Physiology, Ecology and Cultivation in Middle and Low Reaches of Yangtze River of Ministry of Agriculture/Co-Innovation Center for Modern Production Technology of Grain Crops, Yangzhou University, Yangzhou 225009, China ylwang@yzu.edu.cn 
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Abstract:
      In order to investigate the effects of FACE(Free Air CO2 Enrichment:an increase of 200 μmol·mol-1 in the atmospheric CO2 concentration) on the grain yield, and potassium(K) absorption and utilization, FACE treatment experiments were conducted on six rice varieties, including conventional japonica rice, hybrid indica rice, and conventional indica rice. Compared with the control treatment, FACE treatment significantly increased rice yield by 24.17% on average, with the largest increment observed in the conventional indica rice. The K uptake at maturity and use efficiency for grain yield under FACE treatment were promoted by 17.88% and 11.80%, respectively. The maximum increment of K uptake at maturity was observed in the hybrid indica rice, and that of K use efficiency for grain yield was observed in conventional indica rice. The K uptake at maturity was the most important contributor to grain yield. FACE treatment reduced the K content of the rice culm and sheath, leaves and total plant at maturity. The K content of total plants was decreased by an average of 8.43% at maturity, with the largest reduction occurring in the conventional indica rice. The K uptake at maturity was affected by the K content of the rice plant. The K uptake in the culm and sheath and panicle significantly increased, whereas that in the leaf slightly decreased following FACE treatment. The K uptake of each rice organ was important to the K uptake of total plant, with that of the culm and sheath showing greater contribution. FACE treatment promoted K uptake from transplantation to tilling, tilling to heading, and heading to maturity. The total K uptake at maturity was mostly affected by K uptake during transplantation to tilling. FACE treatment promoted the translocation of K to the panicle and culm and sheath, while reducing the translocation to the leaves. FACE treatment reduced the translocation of K to the culm and sheath and leaves by 44.04% at the filling grain stage, and increased the translocation of K to the panicle by 55.43%. The largest translocation to the panicle was found in the conventional indica rice. The K translocation amount and ratio were both beneficial to K use efficiency for grain yield. FACE treatment significantly increased the K use efficiency for dry matter production and K harvest index, while decreasing the K requirement per 1 t grain. In summary, FACE treatment significantly increased the grain yield, K uptake at maturity, K use efficiency for grain yield, K use efficiency for dry matter production, K translocation amount and ratio, and the harvest index, while decreasing the K content at maturity and K requirement per 1 t grain. Taken together, the indica rice varieties were more responsive to the elevated CO2 concentration in the atmosphere than the japonica varieties.