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. 2013 Aug 20;64(14):4207–4224. doi: 10.1093/jxb/ert234

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© The Author 2013. Published by Oxford University Press on behalf of the Society for Experimental Biology.

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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Fig. 5. — Activities of nitrate reductase (NR, nmol NO₃ ^– h^–1 (mg protein)^–1), and glutamine synthetase (GS, h^–1 (mg protein)^–1) in roots (A and B) and leaves (C and D) of P. popularis (Pp) and P. alba × P. glandulosa (Pg) exposed to 10, 100, or 1000 μM NH₄NO₃. Bars indicate mean ± SE (n = 6). Different letters on the bars indicate significant difference. P-values of the ANOVAs of species, N treatment, and their interaction are indicated. *P < 0.05; **P < 0.01; ***P < 0.001; ****P < 0.0001; ns, not significant (this figure is available in colour at JXB online).