Front. Plant Sci. Frontiers in Plant Science Front. Plant Sci. 1664-462X Frontiers Media S.A. 10.3389/fpls.2021.723957 Plant Science Correction Corrigendum: Genes Involved in Stress Response and Especially in Phytoalexin Biosynthesis Are Upregulated in Four Malus Genotypes in Response to Apple Replant Disease Reim Stefanie 1 † Rohr Annmarie-Deetja 2 † Winkelmann Traud 2 * Weiß Stefan 2 Liu Benye 3 Beerhues Ludger 3 Schmitz Michaela 4 Hanke Magda-Viola 1 Flachowsky Henryk 1 1Institute for Breeding Research on Fruit Crops, Julius Kühn-Institut, Federal Research Centre for Cultivated Plants, Dresden, Germany 2Institute of Horticultural Production Systems, Woody Plant and Propagation Physiology Section, Gottfried Wilhelm Leibniz University Hannover, Hanover, Germany 3Institute of Pharmaceutical Biology, Technische Universität Braunschweig, Braunschweig, Germany 4Department of Natural Sciences, Hochschule Bonn-Rhein-Sieg, Rheinbach, Germany

Edited and reviewed by: Giorgio Gambino, National Research Council (CNR), Italy

 *Correspondence: Traud Winkelmann traud.winkelmann@zier.uni-hannover.de

This article was submitted to Plant Pathogen Interactions, a section of the journal Frontiers in Plant Science

†These authors have contributed equally to this work

 28 07 2021 2021 12 723957 11 06 2021 16 06 2021 Copyright © 2021 Reim, Rohr, Winkelmann, Weiß, Liu, Beerhues, Schmitz, Hanke and Flachowsky. 2021 Reim, Rohr, Winkelmann, Weiß, Liu, Beerhues, Schmitz, Hanke and Flachowsky

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 A Corrigendum on Genes Involved in Stress Response and Especially in Phytoalexin Biosynthesis Are Upregulated in Four Malus Genotypes in Response to Apple Replant Disease by Reim, S., Rohr, A.-D., Winkelmann, T., Weiß, S., Liu, B., Beerhues, L., et al. (2020). Front. Plant Sci. 10:1724. doi: 10.3389/fpls.2019.01724 apple replant disease (ARD) gene expression BioMark HD microfluidic system high-throughput qRT-PCR phytoalexins greenhouse bio-test soil properties Malus genotypes

In the original article, there was a mistake in Figure S2 as published. The mistake included the labeling of two steps in the proposed biosynthesis pathway of biphenyl and dibenzofuran phytoalexins. The corrected Figure S2 appears below. Figure S2 has been updated in the original article.

Proposed biosynthetic pathway of biphenyl and dibenzofuran phytoalexins. Solid arrows represent established steps whereas broken arrows mark hypothetical reactions. BIS, biphenyl synthase; OMT, o-methyltransferase; B4H, biphenyl 4-hydroxylase.

In Table S2 of the published article, single amplicon sizes were given incorrectly. They have been corrected, and a corrected Table S2 file is published.

Following a reader's comment, specificity of two primer pairs was tested by sequencing. A paragraph was added to Material And Methods, Primer Selection and RT-qPCR Validation after paragraph 2:

To test the specificity of the primers used to amplify the genes B4Ha and B4Hb (Table S2), an amplicon deep sequencing was conducted. The sequence analysis proved the B4Hb primers to be highly specific. The sequencing results also showed that the B4Ha amplicon is present in both B4Ha and B4Hb. This means that the primers for B4Ha are not gene-specific. This limited specificity should be considered for the interpretation of the respective data.

The authors apologize for these errors and state that they do not change the scientific conclusions of the article in any way. The original article has been updated.

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