Response of Photosynthesis, Growth, Carbon Isotope Discrimination and Osmotic Tolerance of Rice to Elevated CO2 |
| ------------------------------------------------------------------------------------------ |
|
出 版 社：Acta Botanica Sinica |
|
发表时间：2002 |
|
台 站：鼎湖山森林生态系统定位研究站 |
|
作 者：Peng Changlian、 Duan Jun、 Lin Guizhu、 Chen Yizhu、 Peng Shaolin
|
|
点 击 率：4735 |
| ------------------------------------------------------------------------------------------ |
|
关 键 字：null |
| 摘 要：null |
|
关 键 字(英文)：rice cultivars; elevated CO2; photosynthesis; water use efficiency; 13C discrimination; osmotic tolerance |
| 摘 要(英文)：Four rice (Oryza sativa L.) cultivars "IR72", "Tesanai 2", "Guichao 2" and "Ilyou 4480" were grown in two plastic house (15m*3m) wigh 35 ?ol/mol and 60 ?ol/mol CO2 concentration which was controlled by computer. As compared with rice at ambient 35?ol/mol CO2, the changes in photosynthetic rate at elevated CO2 showed up-regulation("IR72" and "Tesanai 2"),stable (unchanged) in "Guichao 2" and down-regulation type ("IIyou 4480"). Growth rate, panicle weight, integrated water use efficiency (wue) calculated from 13C and the capacity of scavenging DPPH (1, 1-dipheny1-2-picrylhydrazyl) free radical were increased at elevated CO2. An increment in total biomass was obesrved in three cultivars by elevated CO2, with the exception of " IIyou 4480". Ratios of panicale weight/total biomass were altered to different extents in tested cultivars by elevated CO2. When leaf segments were subjected to PEG osmotic stress, the electrolyte leakage rate from leaves grown at elevated CO2 was less than that at 35 ?ol/mol CO2. Those intraspecific variations of rice imply a possibility for selecting cultivars with maximal productivity and high tolerance to stresses adapted to elevated CO2 in the future. |
| ------------------------------------------------------------------------------------------ |
| null |
