The mycoparasite Pythium oligandrum induces legume pathogen resistance and shapes rhizosphere microbiota without impacting mutualistic interactions

Frontiers in Plant Science

Plant Science

Elodie Gaulin¹  Kévin Adam¹  Maryam Hashemi¹  Hélène San Clemente¹  Bernard Dumas¹  Mohamed Zouaoui¹  Jean-Malo Couzigou¹  Marielle Aguilar¹  Sébastien Roy²  Thomas Rey³  Rémi Pendaries³  Aurélien Amiel³  Guillaume Marti⁴ 

[1] Laboratoire de Recherche en Sciences Végétales, Université de Toulouse, Centre National de la Recherche Scientifique (CNRS), Université Toulouse III, Toulouse Institut National Polytechnique (INP), Auzeville-Tolosane, France;Laboratoire de Recherche en Sciences Végétales, Université de Toulouse, Centre National de la Recherche Scientifique (CNRS), Université Toulouse III, Toulouse Institut National Polytechnique (INP), Auzeville-Tolosane, France;AGRONUTRITION, Carbonne, France;Laboratoire de Recherche en Sciences Végétales, Université de Toulouse, Centre National de la Recherche Scientifique (CNRS), Université Toulouse III, Toulouse Institut National Polytechnique (INP), Auzeville-Tolosane, France;DE SANGOSSE, Pont-Du-Casse, France;Laboratoire de Recherche en Sciences Végétales, Université de Toulouse, Centre National de la Recherche Scientifique (CNRS), Université Toulouse III, Toulouse Institut National Polytechnique (INP), Auzeville-Tolosane, France;Metatoul-AgromiX Platform, MetaboHUB, National Infrastructure of Metabolomics and Fluxomics, Toulouse, France;

关键词: Pythium oligandrum;    microbiota;    symbiotic interaction;    plant defense;    legumes;    isoflavonoid;   

DOI  :  10.3389/fpls.2023.1156733

 received in 2023-02-01, accepted in 2023-10-02,  发布年份 2023

来源: Frontiers

【 摘 要 】

Pythium oligandrum is a soil-borne oomycete associated with rhizosphere and root tissues. Its ability to enhance plant growth, stimulate plant immunity and parasitize fungal and oomycete preys has led to the development of agricultural biocontrol products. Meanwhile, the effect of P. oligandrum on mutualistic interactions and more generally on root microbial communities has not been investigated. Here, we developed a biological system comprising P. oligandrum interacting with two legume plants, Medicago truncatula and Pisum sativum. P. oligandrum activity was investigated at the transcriptomics level through an RNAseq approach, metabolomics and finally metagenomics to investigate the impact of P. oligandrum on root microbiota. We found that P. oligandrum promotes plant growth in these two species and protects them against infection by the oomycete Aphanomyces euteiches, a devastating legume root pathogen. In addition, P. oligandrum up-regulated more than 1000 genes in M. truncatula roots including genes involved in plant defense and notably in the biosynthesis of antimicrobial compounds and validated the enhanced production of M. truncatula phytoalexins, medicarpin and formononetin. Despite this activation of plant immunity, we found that root colonization by P. oligandrum did not impaired symbiotic interactions, promoting the formation of large and multilobed symbiotic nodules with Ensifer meliloti and did not negatively affect the formation of arbuscular mycorrhizal symbiosis. Finally, metagenomic analyses showed the oomycete modifies the composition of fungal and bacterial communities. Together, our results provide novel insights regarding the involvement of P. oligandrum in the functioning of plant root microbiota.

【 授权许可】

Unknown   
Copyright © 2023 Hashemi, Amiel, Zouaoui, Adam, Clemente, Aguilar, Pendaries, Couzigou, Marti, Gaulin, Roy, Rey and Dumas