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. 2021 Jun 16;8:686110. doi: 10.3389/fmolb.2021.686110

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Copyright © 2021 Worsley, Macey, Prudence, Wilkinson, Murrell and Hutchings.

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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Streptomyces coelicolor M145 and the A. thaliana root endophyte strain Streptomyces M3 show increased root colonization of Arabidopsis thaliana cpr5 plants, which constitutively produce salicylic acid, compared to pad4 and sid2-2 plants, which are deficient in salicylic acid production, and wild-type (wt) Col-0 plants. Root colonization was measured as the average colony forming units (±SE) of Streptomyces bacteria per gram of root, that could be re-isolated from plants four weeks after germination. N = 6 plants per treatment. Plant growth phenotypes are shown for comparison.