Cell autonomous and non-cell autonomous control of rhizobial and mycorrhizal infection in<i>Medicago truncatula</i>

Rival, Pauline; Bono, Jean‐Jacques; Gough, Clare; Bensmihen, Sandra; Rosenberg, Charles

doi:10.4161/psb.22999

Cited by 8 publications

(5 citation statements)

References 21 publications

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“…Myc-LCOs, and DMI3, are also likely to control calcium spiking during mycorrhization (Sieberer et al, 2012;Rival et al, 2013), and Myc-LCOs are proposed to trigger a regulatory mechanism to prevent over-colonization of roots by AM fungi (Lauressergues et al, 2012).…”

Section: Major Responses To Myc-lcos Indicate Important Roles In Cellmentioning

confidence: 99%

Combined genetic and transcriptomic analysis reveals three major signalling pathways activated by Myc‐LCOs in Medicago truncatula

et al. 2015

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SummaryMyc-LCOs are newly identified symbiotic signals produced by arbuscular mycorrhizal (AM) fungi. Like rhizobial Nod factors, they are lipo-chitooligosaccharides that activate the common symbiotic signalling pathway (CSSP) in plants. To increase our limited understanding of the roles of Myc-LCOs we aimed to analyse Myc-LCO-induced transcriptional changes and their genetic control.Whole genome RNA sequencing (RNA-seq) was performed on roots of Medicago truncatula wild-type plants, and dmi3 and nsp1 symbiotic mutants affected in nodulation and mycorrhizal signalling. Plants were treated separately with the two major types of Myc-LCOs, sulphated and nonsulphated.Generalized linear model analysis identified 2201 differentially expressed genes and classified them according to genotype and/or treatment effects. Three genetic pathways for Myc-LCO-regulation of transcriptomic reprogramming were highlighted: DMI3-and NSP1-dependent; DMI3-dependent and NSP1-independent; and DMI3-and NSP1-independent. Comprehensive analysis revealed overlaps with previous AM studies, and highlighted certain functions, especially signalling components and transcription factors.These data provide new insights into mycorrhizal signalling mechanisms, supporting a role for NSP1, and specialisation for NSP1-dependent and -independent pathways downstream of DMI3. Our data also indicate significant Myc-LCO-activated signalling upstream of DMI3 and/or parallel to the CSSP and some constitutive activity of the CSSP.

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Section: Major Responses To Myc-lcos Indicate Important Roles In Cellmentioning

confidence: 99%

Combined genetic and transcriptomic analysis reveals three major signalling pathways activated by Myc‐LCOs in Medicago truncatula

et al. 2015

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“…Initiation of eIT is specifically targeted by AOI in agreement with previous evidence that eIT and cIT formation are under different genetic control (Miri et al ., ) and are mediated by cell‐autonomous mechanisms (Rival et al ., ). Altogether these findings indicate that IT formation is a highly controlled process to which different mechanisms contribute.…”

Section: Discussionmentioning

confidence: 97%

Endosymbiotic Sinorhizobium meliloti modulate Medicago root susceptibility to secondary infection via ethylene

et al. 2019

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Summary A complex network of pathways coordinates nodulation and epidermal root hair infection in the symbiotic interaction between rhizobia and legume plants. Whereas nodule formation was known to be autoregulated, it was so far unclear whether a similar control is exerted on the infection process. We assessed the capacity of Medicago plants nodulated by Sinorhizobium meliloti to modulate root susceptibility to secondary bacterial infection or to purified Nod factors in split‐root and volatile assays using bacterial and plant mutant combinations. Ethylene implication in this process emerged from gas production measurements, use of a chemical inhibitor of ethylene biosynthesis and of a Medicago mutant affected in ethylene signal transduction. We identified a feedback mechanism that we named AOI (for Autoregulation Of Infection) by which endosymbiotic bacteria control secondary infection thread formation by their rhizospheric peers. AOI involves activation of a cyclic adenosine 3′,5′‐monophosphate (cAMP) cascade in endosymbiotic bacteria, which decreases both root infectiveness and root susceptibility to bacterial Nod factors. These latter two effects are mediated by ethylene. AOI is a novel component of the complex regulatory network controlling the interaction between Sinorhizobium meliloti and its host plants that emphasizes the implication of endosymbiotic bacteria in fine‐tuning the interaction.

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“…It was found that root secretions produced relatively more accumulated Nod factors during the early stages of plant growth (early AMF infestation) and relatively less of such signaling substances during later AMF infestation [ 195 ]. AMF may secrete a certain amount of Myc factor at the early stage of infestation to inhibit the accumulation of Rhizobium to the host plant, while the signaling substances produced at the middle stage of infestation changed and the antagonistic effect gradually decreased, showing a progressive synergistic effect on rhizobium [ 196 ]. Although inoculation with AMF showed negative tropism to Rhizobium at the early stage of symbiosis formation, and the two had some antagonistic effects [ 197 ].…”

Section: Plant-amf-rhizobium Work Together To Regulate Metal Homeostasismentioning

confidence: 99%

Signaling and Detoxification Strategies in Plant-Microbes Symbiosis under Heavy Metal Stress: A Mechanistic Understanding

Liu

et al. 2022

Microorganisms

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Plants typically interact with a variety of microorganisms, including bacteria, mycorrhizal fungi, and other organisms, in their above- and below-ground parts. In the biosphere, the interactions of plants with diverse microbes enable them to acquire a wide range of symbiotic advantages, resulting in enhanced plant growth and development and stress tolerance to toxic metals (TMs). Recent studies have shown that certain microorganisms can reduce the accumulation of TMs in plants through various mechanisms and can reduce the bioavailability of TMs in soil. However, relevant progress is lacking in summarization. This review mechanistically summarizes the common mediating pathways, detoxification strategies, and homeostatic mechanisms based on the research progress of the joint prevention and control of TMs by arbuscular mycorrhizal fungi (AMF)-plant and Rhizobium-plant interactions. Given the importance of tripartite mutualism in the plant-microbe system, it is necessary to further explore key signaling molecules to understand the role of plant-microbe mutualism in improving plant tolerance under heavy metal stress in the contaminated soil environments. It is hoped that our findings will be useful in studying plant stress tolerance under a broad range of environmental conditions and will help in developing new technologies for ensuring crop health and performance in future.

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Cell autonomous and non-cell autonomous control of rhizobial and mycorrhizal infection inMedicago truncatula

Abstract: These authors contributed equally to this work.

Cited by 8 publications

References 21 publications

Combined genetic and transcriptomic analysis reveals three major signalling pathways activated by Myc‐LCOs in Medicago truncatula

Combined genetic and transcriptomic analysis reveals three major signalling pathways activated by Myc‐LCOs in Medicago truncatula

Endosymbiotic Sinorhizobium meliloti modulate Medicago root susceptibility to secondary infection via ethylene

Signaling and Detoxification Strategies in Plant-Microbes Symbiosis under Heavy Metal Stress: A Mechanistic Understanding

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