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. 2018 Jul 10;6:e5202. doi: 10.7717/peerj.5202

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©2018 Li et al.

This is an open access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, reproduction and adaptation in any medium and for any purpose provided that it is properly attributed. For attribution, the original author(s), title, publication source (PeerJ) and either DOI or URL of the article must be cited.

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Light micrographs of nodule sections produced by S. meliloti CCNWSX0020 wild-type strain and the dmeF mutant with 100 mg/kg nickel (A and B) or cobalt (C and D).