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. 2011 Sep 6;108(7):1347–1353. doi: 10.1093/aob/mcr227

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© The Author 2011. 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 Non-Commercial License (http://creativecommons.org/licenses/by-nc/2.5/) which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited

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Fig. 1. — Relationships between final shoot biomass (B_S) and leaf N pool (N_L) of 200 willow genotypes (means of three replicates) grown experimentally in a glasshouse under well-watered (A) and water-stressed (B) conditions. For ease of comparison, the regression lines for the two water regimes are shown in the same figure in the inset. Broken lines indicate slope of 1, i.e. a hypothetically constant leaf N efficiency (g mmol⁻¹) across all genotypes and treatments. Quadratic regressions: (A) log_e y = 1·192 log_e x – 0·056 (log_e x)² – 0·597, r² = 0·92, P < 0·001, n = 200; (B) log_e y = 1·410 log_e x – 0·480 (log_e x)² – 0·715, r² = 0·71, P < 0·001, n = 200. Note the log_e scales.