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. 2014 Apr 10;15(4):6031–6045. doi: 10.3390/ijms15046031

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© 2014 by the authors; licensee MDPI, Basel, Switzerland

This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution license (http://creativecommons.org/licenses/by/3.0/).

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Figure 2. — Apparent nitrogenase activity (ANA) of M. truncatula sunn plants grown at sufficient P supply (+P) and during P depletion (−P). Data are given as means of six replicates ± SE. Each point represent the integral of the amount of H₂ evolved measured every five minutes over a 24 h period. The dotted line indicates the point in time when treatments began to differ significantly in ANA (t-test, p < 0.05). The colors distinguish the period of significantly different ANA (reddish) from the period of P depletion but not yet different H₂ evolution (blue).