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. 2019 Jan 8;9:1901. doi: 10.3389/fpls.2018.01901

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Copyright © 2019 Gauthier-Coles, White and Mathesius.

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) and the copyright owner(s) 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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Model for the observed correlation between the site of nodule organogenesis and cortical response to cytokinin. Nodulating legumes typically form nodules originating predominantly in the cortex, and this correlates with the ability to proliferate cortical cells in response to cytokinin, which then leads to pseudonodule formation. Actinorhizal species that nodulate with Frankia spp. typically form nodules from modified lateral roots. These species lack cortical cytokinin responses and pseudonodule formation.