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Open AccessArticle

Molecular Changes Concomitant with Vascular System Development in Mature Galls Induced by Root-Knot Nematodes in the Model Tree Host Populus tremula × P. alba

1
Laboratoire de Biotechnologie Végétale, Université libre de Bruxelles (ULB), Rue des Professeurs Jeener et Brachet 12, B-6041 Gosselies, Belgium
2
Unité Mixte de Recherche 1136, INRA-Université de Lorraine, Interactions Arbres-Microorganismes, Laboratoire d’Excellence ARBRE, Centre INRA-Lorraine, 54280 Champenoux, France
3
CNRS, UMR 8576, UGSF—Unité de Glycobiologie Structurale et Fonctionnelle, University of Lille, F-59000 Lille, France
4
VIB Center for Plant Systems Biology, 9052 Ghent, Belgium
5
Department of Plant Biotechnology and Bioinformatics, Ghent University, 9052 Ghent, Belgium
6
VIB Metabolomics Core, 9052 Ghent, Belgium
7
INRA, Université Côte d′Azur, CNRS, ISA, 06903 Sophia Antipolis, France
*
Author to whom correspondence should be addressed.
These authors contributed equally to this article.
Int. J. Mol. Sci. 2020, 21(2), 406; https://doi.org/10.3390/ijms21020406
Received: 14 October 2019 / Revised: 7 January 2020 / Accepted: 7 January 2020 / Published: 9 January 2020
(This article belongs to the Special Issue Woody Formation and Lignin Biosynthesis in Plants)
One of the most striking features occurring in the root-knot nematode Meloidogyne incognita induced galls is the reorganization of the vascular tissues. During the interaction of the model tree species Populus and M. incognita, a pronounced xylem proliferation was previously described in mature galls. To better characterise changes in expression of genes possibly involved in the induction and the formation of the de novo developed vascular tissues occurring in poplar galls, a comparative transcript profiling of 21-day-old galls versus uninfected root of poplar was performed. Genes coding for transcription factors associated with procambium maintenance and vascular differentiation were shown to be differentially regulated, together with genes partaking in phytohormones biosynthesis and signalling. Specific signatures of transcripts associated to primary cell wall biosynthesis and remodelling, as well as secondary cell wall formation (cellulose, xylan and lignin) were revealed in the galls. Ultimately, we show that molecules derived from the monolignol and salicylic acid pathways and related to secondary cell wall deposition accumulate in mature galls. View Full-Text
Keywords: cell wall; gall; metabolomics; Meloidogyne incognita; phloem; Populus; root-knot nematode; transcriptomics; xylem cell wall; gall; metabolomics; Meloidogyne incognita; phloem; Populus; root-knot nematode; transcriptomics; xylem
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Baldacci-Cresp, F.; Behr, M.; Kohler, A.; Badalato, N.; Morreel, K.; Goeminne, G.; Mol, A.; de Almeida Engler, J.; Boerjan, W.; El Jaziri, M.; Baucher, M. Molecular Changes Concomitant with Vascular System Development in Mature Galls Induced by Root-Knot Nematodes in the Model Tree Host Populus tremula × P. alba. Int. J. Mol. Sci. 2020, 21, 406.

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