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. 2014 Mar 17;6:plu010. doi: 10.1093/aobpla/plu010

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Published by Oxford University Press on behalf of the Annals of Botany Company.

This is an Open Access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/3.0/), which permits unrestricted reuse, distribution, and reproduction in any medium, provided the original work is properly cited.

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Figure 6. — Age-dependent change of (A) carbon and (B) nitrogen content (%), and (C) C/N ratio of leaf 6 and leaf 10 of tobacco plants grown in 15-L sand culture under ambient (360 ppm) and elevated (700 ppm) CO₂ concentrations (means of n = 3 and standard deviation). Asterisks as in Fig. 1.