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. 2017 Jun 21;8:1089. doi: 10.3389/fpls.2017.01089

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Copyright © 2017 Caballo-Ponce, Murillo, Martínez-Gil, Moreno-Pérez, Pintado and Ramos.

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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Symptoms induced by Pseudomonas savastanoi and pathogen visualization within knots. Knots induced by Psv NCPPB 3335 in (A) woody olive trees at 90 days post-inoculation (dpi) and (B) micropropagated (non-woody) olive plants at 28 dpi. (C) Excrescence-like symptoms generated by Psf NCPPB 1006 at 90 dpi in ash. (D) Transverse section of a 30-dpi olive knot stained with xylene blue-pyrofuchsin. White and black arrows indicate newly formed xylem vessels and cavities within the knot, respectively. (E) Detail of bacterial cavity within a 35-dpi olive knot filled with Psv cells.