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. 2021 Feb 15;12:628697. doi: 10.3389/fpls.2021.628697

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Copyright © 2021 Serrazina, Machado, Costa, Duque and Malhó.

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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Cytological analysis of transgenic CcAOS Arabidopsis roots inoculated with P. cinnamomi. Images (from line CcAOS1) are representative of the three transgenic lines. Scale Bars = 30 μm. (A,B) One day after inoculation, mycelia develop haustoria (h) on epidermal cells of Ler-0 wild type (A) and transgenic CcAOS (B) roots. Arrows indicate hyphae penetrating the cortex intercellularly. (C,D) Three days after inoculation, stromata (s) develop in cortical cells and hyphae can be observed in the stele (arrow).