|
| Different responses to elevated ozone among cultivars in the photosynthetic characteristics and chlorophyll of rice |
| Received:July 24, 2022 |
| View Full Text View/Add Comment Download reader |
| KeyWord:ozone;rice;photosynthesis;chlorophyll;O3-FACE |
| Author Name | Affiliation | E-mail | | HE Longxin | Key Laboratory of Ecosystem Carbon Source and Sink, China Meteorological Administration（ECSS-CMA）, Key Laboratory of Agrometeorology of Jiangsu Province, School of Applied Meteorology, Nanjing University of Information Science & Technology, Nanjing 210044, China | | | XU Yansen | Key Laboratory of Ecosystem Carbon Source and Sink, China Meteorological Administration（ECSS-CMA）, Key Laboratory of Agrometeorology of Jiangsu Province, School of Applied Meteorology, Nanjing University of Information Science & Technology, Nanjing 210044, China | | | FENG Zhaozhong | Key Laboratory of Ecosystem Carbon Source and Sink, China Meteorological Administration（ECSS-CMA）, Key Laboratory of Agrometeorology of Jiangsu Province, School of Applied Meteorology, Nanjing University of Information Science & Technology, Nanjing 210044, China | zhaozhong.feng@nuist.edu.cn | | ZHANG Han | Key Laboratory of Ecosystem Carbon Source and Sink, China Meteorological Administration（ECSS-CMA）, Key Laboratory of Agrometeorology of Jiangsu Province, School of Applied Meteorology, Nanjing University of Information Science & Technology, Nanjing 210044, China | | | CAO Rong | Key Laboratory of Ecosystem Carbon Source and Sink, China Meteorological Administration（ECSS-CMA）, Key Laboratory of Agrometeorology of Jiangsu Province, School of Applied Meteorology, Nanjing University of Information Science & Technology, Nanjing 210044, China | | | ZHONG Xin | Key Laboratory of Ecosystem Carbon Source and Sink, China Meteorological Administration（ECSS-CMA）, Key Laboratory of Agrometeorology of Jiangsu Province, School of Applied Meteorology, Nanjing University of Information Science & Technology, Nanjing 210044, China | | | MA Yanze | Key Laboratory of Ecosystem Carbon Source and Sink, China Meteorological Administration（ECSS-CMA）, Key Laboratory of Agrometeorology of Jiangsu Province, School of Applied Meteorology, Nanjing University of Information Science & Technology, Nanjing 210044, China | |
|
| Hits: 1569 |
| Download times: 2369 |
| Abstract: |
| It is important to select the most O3-tolerant cultivars to adapt to the high O3 environment. This study assessed the genotypic differences of rice（Oryza sativa L.）exposed to elevated O3 in terms of photosynthetic characteristics and chlorophyll content at the early and middle grain-filling stages（4 hybrid cultivars and 8 inbred cultivars）. There were two O3 treatments（A-O3：Ambient atmosphere; EO3：1.5 times ambient O3 concentration）based on a Free-Air O3 Concentration Enhancement system. The results showed that E-O3 decreased the light-saturated photosynthetic rate（Asat）of hybrid rice by 15.1% and 26.8%, stomatal conductance（gs）by 9.2 % and 27.4%, and Asat of inbred rice by 8.7% and 20.4%, and gs by 20.2% and 13.1% at the early and middle grain-filling stages, respectively. While the Asat and gs of rice decreased during these two periods, the intercellular CO2 concentration（Ci）of leaves of most rice varieties remained almost unchanged and the electron transfer efficiency（ETR）changed at varying degrees, which indicated that the differences in the effects of O3 concentration on different rice varieties was mainly due to the limitation of non-stomatal factors such as ETR and mesophyll cell assimilation ability. Due to the cumulative effect of O3, the total chlorophyll in most of the tested rice cultivars showed significant decreases only at the mid-grain-filling stage, and the instantaneous water use efficiency（WUE）changed from an increase at the early grain filling stage to a decrease at the middle grain filling stage. In conclusion, there are significant differences in photosynthesis responses to E-O3 among cultivars, with hybrid rice being more sensitive than inbred rice, since it is indicated that Yangliangyou 6 is the most sensitive, whereas Huaidao 5 and Nanjing 5055 are more tolerant. |
|
|
|
