<i>Rhizobium fredii</i> synthesizes an array of lipooligosaccharides, including a novel compound with glucose inserted into the backbone of the molecule

Bec-Ferté, Marie Pierre; Krishnan, Hari B.; Savagnac, Arlette; Pueppke, Steven G.; Promé, Jean‐Claude

doi:10.1016/0014-5793(96)00903-9

Cited by 34 publications

(11 citation statements)

References 23 publications

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“…The symbiotic specificity is determined by exchanging species- specific signals between a host plant and its symbiotic rhizobium (Perret et al, 2000 ). It is well known that rhizobia utilizes surface polysaccharides, secreted proteins/type III secretion system (T3SS) and nod factor to modulate host range (Lerouge et al, 1990 ; Schultze et al, 1992 ; Stacey, 1995 ; Bec-Ferte et al, 1996 ; Deakin and Broughton, 2009 ; Yang et al, 2010 ; Okazaki et al, 2013 ), while the mechanisms underlying the corresponding recognition of these rhizobial signals and compatibility control of the legume–rhizobia interaction in the host legume are not well understood. To unravel such mechanisms, it is critical to investigate the differences of nod factor signaling reception and transduction in the host legume inoculated with different rhizobia strains.…”

Section: Introductionmentioning

confidence: 99%

RNA-Seq Analysis of Differential Gene Expression Responding to Different Rhizobium Strains in Soybean (Glycine max) Roots

Yuan

Chen

et al. 2016

Front. Plant Sci.

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The root nodule symbiosis (RNS) between legume plants and rhizobia is the most efficient and productive source of nitrogen fixation, and has critical importance in agriculture and mesology. Soybean (Glycine max), one of the most important legume crops in the world, establishes a nitrogen-fixing symbiosis with different types of rhizobia, and the efficiency of symbiotic nitrogen fixation in soybean greatly depends on the symbiotic host-specificity. Although, it has been reported that rhizobia use surface polysaccharides, secretion proteins of the type-three secretion systems and nod factors to modulate host range, the host control of nodulation specificity remains poorly understood. In this report, the soybean roots of two symbiotic systems (Bradyrhizobium japonicum strain 113-2-soybean and Sinorhizobium fredii USDA205-soybean)with notable different nodulation phenotypes and the control were studied at five different post-inoculation time points (0.5, 7–24 h, 5, 16, and 21 day) by RNA-seq (Quantification). The results of qPCR analysis of 11 randomly-selected genes agreed with transcriptional profile data for 136 out of 165 (82.42%) data points and quality assessment showed that the sequencing library is of quality and reliable. Three comparisons (control vs. 113-2, control vs. USDA205 and USDA205 vs. 113-2) were made and the differentially expressed genes (DEGs) between them were analyzed. The number of DEGs at 16 days post-inoculation (dpi) was the highest in the three comparisons, and most of the DEGs in USDA205 vs. 113-2 were found at 16 dpi and 21 dpi. 44 go function terms in USDA205 vs. 113-2 were analyzed to evaluate the potential functions of the DEGs, and 10 important KEGG pathway enrichment terms were analyzed in the three comparisons. Some important genes induced in response to different strains (113-2 and USDA205) were identified and analyzed, and these genes primarily encoded soybean resistance proteins, NF-related proteins, nodulins and immunity defense proteins, as well as proteins involving flavonoids/flavone/flavonol biosynthesis and plant-pathogen interaction. Besides, 189 candidate genes are largely expressed in roots and\or nodules. The DEGs uncovered in this study provides molecular candidates for better understanding the mechanisms of symbiotic host-specificity and explaining the different symbiotic effects between soybean roots inoculated with different strains (113-2 and USDA205).

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Section: Introductionmentioning

confidence: 99%

RNA-Seq Analysis of Differential Gene Expression Responding to Different Rhizobium Strains in Soybean (Glycine max) Roots

Yuan

Chen

et al. 2016

Front. Plant Sci.

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“…The best-known bacterially derived signal is the Nod factor, a family of lipo-chitooligosaccharides with various strain-specific chemical decorations (4)(5)(6). The ability to induce the production of bacterial Nod factors in response to hostsecreted flavonoids and to subsequently perceive the signal by the cognate host receptor(s) is widely thought to play a key role in defining the host range (3,(7)(8)(9)(10).…”

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confidence: 99%

R gene-controlled host specificity in the legume–rhizobia symbiosis

Yang

Tang

Gao

et al. 2010

Proc. Natl. Acad. Sci. U.S.A.

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266

268

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Leguminous plants can enter into root nodule symbioses with nitrogen-fixing soil bacteria known as rhizobia. An intriguing but still poorly understood property of the symbiosis is its host specificity, which is controlled at multiple levels involving both rhizobial and host genes. It is widely believed that the host specificity is determined by specific recognition of bacterially derived Nod factors by the cognate host receptor(s). Here we describe the positional cloning of two soybean genes Rj2 and Rfg1 that restrict nodulation with specific strains of Bradyrhizobium japonicum and Sinorhizobium fredii, respectively. We show that Rj2 and Rfg1 are allelic genes encoding a member of the Toll-interleukin receptor/nucleotide-binding site/leucine-rich repeat (TIR-NBS-LRR) class of plant resistance (R) proteins. The involvement of host R genes in the control of genotype-specific infection and nodulation reveals a common recognition mechanism underlying symbiotic and pathogenic host-bacteria interactions and suggests the existence of their cognate avirulence genes derived from rhizobia. This study suggests that establishment of a root nodule symbiosis requires the evasion of plant immune responses triggered by rhizobial effectors.soybean | nodulation | nitrogen fixation | defense

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“…Nod factors isolated from M. loci NZP2213 consist of a dimeric chito-oligosaccharidic backbone [12], whereas a pentameric Nod factor whose middle G1cNAc residue is replaced by a glucosyl group is explored from Sinorhizobium fredii [13]. Rhizobium sp.…”

Section: Nodulating Microsymbiontsmentioning

confidence: 99%