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. 2016 Jun 13;7:835. doi: 10.3389/fpls.2016.00835

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Copyright © 2016 Checcucci, Azzarello, Bazzicalupo, Galardini, Lagomarsino, Mancuso, Marti, Marzano, Mocali, Squartini, Zanardo and Mengoni.

This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) or licensor are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.

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Nitrogen fixation efficiency of nodules. Reduction assay results expressed in terms of nmoles ethylene/h/plant. Box-and-Whisker plots are from 3 to 4 nodules each from different plant.