Photosynthetica, 2008 (vol. 46), issue 2

Photosynthetica 2008, 46(2):318-320 | DOI: 10.1007/s11099-008-0059-z

Elevated CO2 concentration enhances the role of the ear to the flag leaf in determining grain yield of wheat

C. W. Zhu1,*, J. G. Zhu1, G. Liu1, Q. Zeng1, Z. B. Xie1, J. Pang2, Z. Z. Feng2, H. Y. Tang1, L. Wang1
1 State Key Laboratory of Soil and Sustainable Agriculture, Institute of Soil Science, Chinese Academy of Sciences, Nanjing, P.R. China
2 Department of Global Agricultural Sciences, Graduate School of Agricultural and Life Sciences, The University of Tokyo, Tokyo, Japan

Net photosynthetic rate (P N) of ear and flag leaf during grain filling stage and grain yield of plants with non-darkened or darkened flag leaf or darkened ear were examined in two different CO2 concentrations: ambient (AC) and AC+200 µmol mol-1 (EC). Ear showed much higher enhancement (56 %) of P N than flag leaf (23 %) under EC. Moreover, CO2 enrichment shortened the photosynthetic duration of flag leaf relative to ear. In this way the ratio of ear to flag leaf contribution to grain yield increased from 1.18 (AC) to 1.39 (EC).

Keywords: net photosynthetic rate; Triticum aestivum

Received: August 31, 2007; Accepted: February 6, 2008; Published: June 1, 2008Show citation

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Zhu, C.W., Zhu, J.G., Liu, G., Zeng, Q., Xie, Z.B., Pang, J., ... Wang, L. (2008). Elevated CO2 concentration enhances the role of the ear to the flag leaf in determining grain yield of wheat. Photosynthetica, 46(2), 318-320. doi: 10.1007/s11099-008-0059-z.
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