Repeated leaf wounding alters the colonization of Medicago truncatula roots by beneficial and pathogenic microorganisms

Plant, Cell & Environment
Ramona LandgrafBettina Hause

Abstract

In nature, plants are subject to various stresses that are often accompanied by wounding of the aboveground tissues. As wounding affects plants locally and systemically, we investigated the impact of leaf wounding on interactions of Medicago truncatula with root-colonizing microorganisms, such as the arbuscular mycorrhizal (AM) fungus Glomus intraradices, the pathogenic oomycete Aphanomyces euteiches and the nitrogen-fixing bacterium Sinorhizobium meliloti. To obtain a long-lasting wound response, repeated wounding was performed and resulted in locally and systemically increased jasmonic acid (JA) levels accompanied by the expression of jasmonate-induced genes, among them the genes encoding allene oxide cyclase 1 (MtAOC1) and a putative cell wall-bound invertase (cwINV). After repeated wounding, colonization with the AM fungus was increased, suggesting a role of jasmonates as positive regulators of mycorrhization, whereas the interaction with the rhizobacterium was not affected. In contrast, wounded plants appeared to be less susceptible to pathogens which might be caused by JA-induced defence mechanisms. The effects of wounding on mycorrhization and pathogen infection could be partially mimicked by foliar application of JA. In...Continue Reading

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Citations

Mar 19, 2013·Journal of Experimental Botany·Matthias Erb, Jing Lu
Apr 9, 2013·Journal of Experimental Botany·Mohammad Reza Bolouri Moghaddam, Wim Van den Ende
Oct 9, 2013·Annual Review of Cell and Developmental Biology·Caroline Gutjahr, Martin Parniske
Jan 23, 2016·Plant Molecular Biology·Amanda RosierHarsh P Bais
Jun 23, 2015·Plant Biotechnology Journal·Chun Yan, Daoxin Xie
Jan 13, 2015·The New Phytologist·María J PozoJosé M García-Garrido
Feb 24, 2015·The New Phytologist·Ricardo A R MachadoMatthias Erb
Jun 19, 2012·Biochimie·Claus WasternackBettina Hause
Oct 8, 2013·Biotechnology Advances·Claus Wasternack
Jul 28, 2018·Physiologia Plantarum·Stefania De DomenicoAngelo Santino
Jan 18, 2020·International Journal of Molecular Sciences·Fatima El AmeranyBettina Hause
Jun 18, 2021·Plant Science : an International Journal of Experimental Plant Biology·Wei ZhangChuan-Chao Dai

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