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| Effects of elevated CO2 on phosphorus absorption and utilization in different rice varieties |
| Received:June 15, 2020 |
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| KeyWord:elevated CO2;rice;variety type;grain yield;phosphorus absorption;phosphorus utilization |
| Author Name | Affiliation | E-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 | | | 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 | | | 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 | gcdong@yzu.edu.cn |
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| Abstract: |
| Six rice varieties, including conventional japonica rice, hybrid indica rice, and conventional indica rice, were used to study the effects of free-air CO2 enrichment(FACE) (atmospheric CO2 concentration increased by 200 μmol·mol-1)on the phosphorus absorption, distribution, transportation, and utilization, and yield of different types of rice. The results showed that FACE significantly increased rice yield by an average of 24.17%; the yields of conventional japonica rice, hybrid indica rice, and conventional indica rice increased by 19.38%, 24.02%, and 29.10%, respectively, under FACE. Furthermore, FACE increased the phosphorus content of plants by 2.51% and 6.07% at the heading and mature stage, respectively. The largest increases in phosphorus content were observed in conventional indica rice and conventional japonica rice at the heading and mature stage, respectively. However, these differences between FACE and the control were not significant. Phosphorus absorption was increased by 25.42% and 32.51% at the heading and mature stage, respectively, under FACE. The largest increases in phosphorus uptakes were observed in conventional indica rice and conventional japonica rice at the heading and mature stage, respectively. The amount of phosphorus taken up during the mature stage was strongly and positively correlated with rice yield(r=0.457**). There were no significant effects of FACE on the proportion of phosphorus in each organ at the heading or mature stage; however, there were significant differences in these proportions among varieties. Stem phosphorus transfer rate and panicle phosphorous content increased by 25.77% and 36.18%, respectively, when plants were subjected to FACE. Conventional indica rice exhibited the largest increases in both of the aforementioned traits. Promoting the transfer of phosphorous to panicles was beneficial for increasing rice yield(r=0.410**). The FACE treatment reduced the phosphorus grain production efficiency and dry matter production efficiency of conventional japonica rice and indica rice but increased the phosphorus dry matter and grain production efficiency of hybrid indica rice. Finally, FACE significantly increased the partial productivity of phosphorus fertilization by 24.17%, with conventional indica rice showing the largest increase. In summary, FACE significantly increased rice yield, phosphorus absorption, phosphorus transfer, and partial productivity of phosphorus fertilization. Significant differences were observed among rice varieties. |
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