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. 2015 Sep 11;209(2):705–720. doi: 10.1111/nph.13630

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© 2015 The Authors. New Phytologist © 2015 New Phytologist Trust

This is an open access article under the terms of the Creative Commons Attribution License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited.

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Azolla root xylem development upon cytokinin and auxin treatments. (a–c) Nomarski interference contrast micrographs of Azolla filiculoides roots treated with solvent (control), 0.5 μM trans‐zeatin (CK) and 0.1 μM IAA; blow‐ups of marked positions along the root show details of the xylem phenotypes, marked with arrowheads. A, root apical cell; PX, protoxylem; MX, metaxylem. (d–i) Quantification of observed alterations in the xylem phenotype after control, 0.5 μM CK and 0.1 μM IAA treatment. Data points are derived from evaluation of at least 40 roots per experiment (n = 40). Root cap (RC).