Photosynthetica 2002, 40(2):237-242 | DOI: 10.1023/A:1021349825156
Gas Exchange Responses to CO2 Concentration Instantaneously Elevated in Flag Leaves of Winter Wheat Cultivars Released in Different Years
- 1 The Chinese Academy of Sciences, Laboratory of Quantitative Vegetation Ecology, Institute of Botany, Beijing, P.R. China
- 2 The Chinese Academy of Sciences, Laboratory of Basic Research on Photosynthesis, Institute of Botany, Beijing, P.R. China
- 3 Beijing Academy of Agroforestry, Institute of Crop Science, Beijing, P.R. China
Three winter wheat (Triticum aestivum L.) cultivars, representatives of those widely cultivated in Beijing over the past six decades, were grown in the same environmental conditions. Net photosynthetic rate (PN) per unit leaf area and instantaneous water use efficiency (WUE) of flag leaves increased with elevated CO2 concentration. With an increase in CO2 concentration from 360 to 720 µmol mol-1, PN and WUE of Jingdong 8 (released in 1990s and having the highest yield) increased by 173 and 81 %, while those of Nongda 139 (released in 1970s) increased by 88 and 66 %, and Yanda 1817 (released in 1945, with lowest yield) by 76 and 65 %. Jingdong 8 had the highest PN and WUE values under high CO2 concentration, but Yanda 1817 showed the lowest PN. Stomatal conductance (gs) of Nongda 139 and Yanda 1817 declined with increasing CO2 concentration, but gs of Jingdong 8 firstly went down and then up as the CO2 concentration further increased. Intercellular CO2 concentration (Ci) of Jingdong 8 and Nongda 139 increased when CO2 concentration elevated, while that of Yanda 139 increased at the first stage and then declined. Jingdong 8 had the lowest Ci of the three wheat cultivars, and Yanda 1817 had the highest Ci value under lower CO2 concentrations. However, Jingdong 8 had the highest PN and lowest Ci at the highest CO2 concentration which indicates that its photosynthetic potential may be high.
Additional key words: Ci; Ci, Ca; net photosynthetic rate; stomatal conductance; water use efficiency; transpiration rate
Published: June 1, 2002 Show citation
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