Gas exchange responses to CO2 concentration instantaneously elevated in flag leaves of winter wheat cultivars released in different years

文献类型： 外文期刊

第一作者： Liu, HQ

作者： Liu, HQ;Jiang, GM;Zhang, QD;Sun, JZ;Guo, RJ;Gao, LM;Bai, KZ;Kuang, TY

作者机构：

关键词： C-i; C-i/C-a; net photosynthetic rate; stomatal conductance; water use efficiency; transpiration rate

期刊名称：PHOTOSYNTHETICA （ 影响因子：3.189； 五年影响因子：3.38 ）

ISSN： 0300-3604

年卷期： 2002 年 40 卷 2 期

页码：

收录情况： SCI

摘要： 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 (P-N) 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 mumol mol(-1), P-N 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 P-N and WUE values under high CO2 concentration, but Yanda 1817 showed the lowest P-N. Stomatal conductance (g(s)) of Nongda 139 and Yanda 1817 declined with increasing CO2 concentration, but g(s) of Jingdong 8 firstly went down and then up as the CO2 concentration further increased. Intercellular CO2 concentration (C-i) 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 C-i of the three wheat cultivars, and Yanda 1817 had the highest C-i value under lower CO2 concentrations. However, Jingdong 8 had the highest P-N and lowest C-i at the highest CO2 concentration which indicates that its photosynthetic potential may be high.

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