Integration of Rps2, Rmd, and Rj2 Into Linkage Group J of the Soybean Molecular Map

Polzin, Kayla M.; Lohnes, D. G.; Nickell, C. D.; Shoemaker, R. C.

doi:10.1093/oxfordjournals.jhered.a111462

Cited by 66 publications

(40 citation statements)

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“…The Rj2 locus was previously mapped to the soybean linkage group J (chromosome 16) (23)(24)(25). We carried out fine mapping of the locus using an F 2 population derived from the cross between L76-1988 and L82-2024 (hereafter referred to as L76 and L82, respectively).…”

mentioning

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.

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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mentioning

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.

266

268

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“…A class 6 RGA mapped to linkage group Ni near Rps1 (35). A large cluster of RGAs representing five of the different classes mapped to linkage group J and encompassed a resistance gene cluster including Rmd, Rps2, and Rj2 (32) composite map shown in Fig. 5 was constructed using the computer program JOINMAP (33) and markers common to both populations.…”

Section: Resultsmentioning

confidence: 99%

Resistance gene analogs are conserved and clustered in soybean

1997

Trends in Genetics

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Sequences of cloned resistance genes from a wide range of plant taxa reveal significant similarities in sequence homology and structural motifs. This is observed among genes conferring resistance to viral, bacterial, and fungal pathogens. In this study, oligonucleotide primers designed for conserved sequences from coding regions of disease resistance genes N (tobacco), RPS2 (Arabidopsis) and L6 (flax) were used to amplify related sequences from soybean [Glycine max (L.) Merr.]. Sequencing of amplification products indicated that at least nine classes of resistance gene analogs (RGAs) were detected. Genetic mapping of members of these classes located them to eight different linkage groups. Several RGA loci mapped near known resistance genes. A bacterial artificial chromosome library of soybean DNA was screened using primers and probes specific for eight RGA classes and clones were identified containing sequences unique to seven classes. Individual bacterial artificial chromosomes contained 2-10 members of single RGA classes. Clustering and sequence similarity of members of RGA classes suggests a common process in their evolution. Our data indicate that it may be possible to use sequence homologies from conserved motifs of cloned resistance genes to identify candidate resistance loci from widely diverse plant taxa.

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“…The first symptom is usually a circular area of white to light gray, superficial powdery growth on the upper leaf surface. A resistant gene, Rmd, was closely mapped with other soybean genes (Rps2 and Rj2 for phytophthora root and stem rot resistance and ineffective bradyrhizobia nodulation, respectively) with flanking markers of RFLP markers A233 and A724 within a 3.8-cM region on LG-J (Polzin et al 1994).…”

Section: Idh2 Fasmentioning

confidence: 99%

“…The recessive gene rj1, which is closely mapped to the f (fasciated stem) and Idh1 (isocitrate dehydrogenase) loci in LG-D1b-W (classical LG 11), controls the nonnodulation in genotypes of T181 and T201 (Devine and Kuykendall 1996). The dominant Rj2 detected in cultivars Hardee and CNS is associated with ineffective nodulation response with Bradyrhizobium japonicum and was mapped in LG-J, which is closely linked to the phytophthora resistance gene Rps2 (Devine et al 1991;Polzin et al 1994). Also, the dominant allele Rj4 showed ineffective nodulation in response to B. elkanii and was mapped in the soybean genetic map (Matthews et al 2001).…”

Section: Nodulation Genesmentioning

confidence: 99%

“…Decreased linolenic acid content will reduce or eliminate the need for hydrogenation and associated trans fatty acid production (List et al 2000). Seven genes for controlling palmitic acid content in soybean have been reported, but only the fap2 contributed by the C1727 genotype and a major gene from N87-2122-4 were mapped on LG-D and A1, respectively (Nickell et al 1994;Li et al 2002). The genes controlling another saturated FA, stearic acid, are Fas, St1, and St2.…”

Section: Genes For Fatty Acid Compositionmentioning

confidence: 99%

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