期刊
NEW PHYTOLOGIST
卷 221, 期 2, 页码 743-749出版社
WILEY
DOI: 10.1111/nph.15574
关键词
Aphanomyces euteiches; immunity; lipo-chitooligosaccharide (LOS); Medicago truncatula; oomycete; reactive oxygen species (ROS); symbiosis
资金
- Region Occitanie
- CNRS [INEE 36]
- Universite Paul Sabatier
- Ministere de l'Enseignement Superieur et de la Recherche
- French Agence Nationale de la Recherche [ANR-08-BLAN-0208-01, ANR-10-GENM-0007, ANR-14-CE18-0008-01]
- Agence Nationale de la Recherche (ANR) [ANR-14-CE18-0008, ANR-10-GENM-0007, ANR-08-BLAN-0208] Funding Source: Agence Nationale de la Recherche (ANR)
Molecular signals released by microbes at the surface of plant roots and leaves largely determine host responses, notably by triggering either immunity or symbiosis. How these signalling pathways cross-talk upon coincident perception of pathogens and symbionts is poorly described in plants forming symbiosis. Nitrogen fixing symbiotic Rhizobia spp. and arbuscular mycorrhizal fungi produce lipo-chitooligosaccharides (LCOs) to initiate host symbiotic programmes. In Medicago truncatula roots, the perception of LCOs leads to reduced efflux of reactive oxygen species (ROS). By contrast, pathogen perception generally triggers a strong ROS burst and activates defence gene expression. Here we show that incubation of M. truncatula seedlings with culture filtrate (CF) of the legume pathogen Aphanomyces euteiches alone or simultaneously with Sinorhizobium meliloti LCOs, resulted in a strong ROS release. However, this response was completely inhibited if CF was added after pre-incubation of seedlings with LCOs. By contrast, expression of immunity-associated genes in response to CF and disease resistance to A. euteiches remained unaffected by LCO treatment of M. truncatula roots. Our findings suggest that symbiotic plants evolved ROS inhibition response to LCOs to facilitate early steps of symbiosis whilst maintaining a parallel defence mechanisms toward pathogens.
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