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. 2014;9(3):e28197.
doi: 10.4161/psb.28197. Epub 2014 Jan 1.

Immunosuppression during Rhizobium-legume symbiosis

Li Luo  1 , Dawei Lu  2
Affiliations

Immunosuppression during Rhizobium-legume symbiosis

Li Luo et al. Plant Signal Behav. 2014.

Abstract

Rhizobium infects host legumes to elicit new plant organs, nodules where dinitrogen is fixed as ammonia that can be directly utilized by plants. The nodulation factor (NF) produced by Rhizobium is one of the determinant signals for rhizobial infection and nodule development. Recently, it was found to suppress the innate immunity on host and nonhost plants as well as its analogs, chitins. Therefore, NF can be recognized as a microbe/pathogen-associated molecular pattern (M/PAMP) like chitin to induce the M/PAMP triggered susceptibility (M/PTS) of host plants to rhizobia. Whether the NF signaling pathway is directly associated with the innate immunity is not clear till now. In fact, other MAMPs such as lipopolysaccharide (LPS), exopolysaccharide (EPS) and cyclic-β-glucan, together with type III secretion system (T3SS) effectors are also required for rhizobial infection or survival in leguminous nodule cells. Interestingly, most of them play similarly negative roles in the innate immunity of host plants, though their signaling is not completely elucidated. Taken together, we believe that the local immunosuppression on host plants induced by Rhizobium is essential for the establishment of their symbiosis.

Keywords: PAMP triggered susceptibility; Rhizobium; immunosuppression; legume; nodulation factor; symbiosis.

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References

    1. Postel S, Kemmerling B. Plant systems for recognition of pathogen-associated molecular patterns. Semin Cell Dev Biol. 2009;20:1025–31. doi: 10.1016/j.semcdb.2009.06.002. - DOI - PubMed
    1. Block A, Alfano JR. Plant targets for Pseudomonas syringae type III effectors: virulence targets or guarded decoys? Curr Opin Microbiol. 2011;14:39–46. doi: 10.1016/j.mib.2010.12.011. - DOI - PMC - PubMed
    1. Rigano LA, Payette C, Brouillard G, Marano MR, Abramowicz L, Torres PS, Yun M, Castagnaro AP, Oirdi ME, Dufour V, et al. Bacterial cyclic beta-(1,2)-glucan acts in systemic suppression of plant immune responses. Plant Cell. 2007;19:2077–89. doi: 10.1105/tpc.106.047944. - DOI - PMC - PubMed
    1. Spaink HP. Root nodulation and infection factors produced by rhizobial bacteria. Annu Rev Microbiol. 2000;54:257–88. doi: 10.1146/annurev.micro.54.1.257. - DOI - PubMed
    1. Gibson KE, Kobayashi H, Walker GC. Molecular determinants of a symbiotic chronic infection. Annu Rev Genet. 2008;42:413–41. doi: 10.1146/annurev.genet.42.110807.091427. - DOI - PMC - PubMed

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