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. 2016 Mar 31;7:352. doi: 10.3389/fpls.2016.00352

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Copyright © 2016 McDonald and Ward.

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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Organismal phylogenetic tree. Conceptual phylogenetic tree summarizing the relationships between organisms addressed in this paper and depicting the presence or absence in the genome of each type of ammonium transporter. The archaeal and bacterial branches are collapsed for clarity. AMT = ammonium transporter genes in the AMT clade. MEP = ammonium transporter genes in the MEP (methylammonium permease) clade. Rhesus = Rhesus factor proteins. + indicates one or multiple copies of a transporter of this type is/are present in the genome. ? indicates that genes from a limited number of species, such as Nostoc spp., recovered without support in this group of organisms. h indicates likely horizontal gene transfer into a limited number of species.