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Microsymbiont discrimination mediated by a host-secreted peptide in Medicago truncatula

by Zheng, Qiaolin , Wang, Dong , Zhu, Hongyan , Fedorova, Elena , Griffitts, Joel S. , Wang, Qi , Pan, Huairong , Liu, Jinge , Qin, Qiulin , Price, Paul A. , Yang, Shengming , Bisseling, Ton

in Alfalfa / Apoptosis / Bacteria / Bacteroids / Biological Sciences / Cell death / Cloning / Ecological niches / Endosymbionts / EPS / Genetic control / Host plants / Incompatibility / Laboratorium voor Moleculaire biologie / Laboratory of Molecular Biology / Legumes / Medicago truncatula / Nitrogen / Nitrogen fixation / Nitrogen-fixing bacteria / Nitrogenation / Nodules / Peptides / Plant Biology / Root nodules / Senescence / Sinorhizobium meliloti / Symbiosis

2017

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Microsymbiont discrimination mediated by a host-secreted peptide in Medicago truncatula

by Zheng, Qiaolin , Wang, Dong , Zhu, Hongyan , Fedorova, Elena , Griffitts, Joel S. , Wang, Qi , Pan, Huairong , Liu, Jinge , Qin, Qiulin , Price, Paul A. , Yang, Shengming , Bisseling, Ton

2017

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Microsymbiont discrimination mediated by a host-secreted peptide in Medicago truncatula

by Zheng, Qiaolin , Wang, Dong , Zhu, Hongyan , Fedorova, Elena , Griffitts, Joel S. , Wang, Qi , Pan, Huairong , Liu, Jinge , Qin, Qiulin , Price, Paul A. , Yang, Shengming , Bisseling, Ton

2017

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Journal Article

Microsymbiont discrimination mediated by a host-secreted peptide in Medicago truncatula

Zheng, Qiaolin,

Wang, Dong,

Zhu, Hongyan,

Fedorova, Elena,

Griffitts, Joel S.,

Wang, Qi,

Pan, Huairong,

Liu, Jinge,

Qin, Qiulin,

Price, Paul A.,

Yang, Shengming,

Bisseling, Ton

2017

Overview

The legume–rhizobial symbiosis results in the formation of root nodules that provide an ecological niche for nitrogen-fixing bacteria. However, plant–bacteria genotypic interactions can lead to wide variation in nitrogen fixation efficiency, and it is not uncommon that a bacterial strain forms functional (Fix⁺) nodules on one plant genotype but nonfunctional (Fix⁻) nodules on another. Host genetic control of this specificity is unknown. We herein report the cloning of the Medicago truncatula NFS1 gene that regulates the fixation-level incompatibility with the microsymbiont Sinorhizobium meliloti Rm41. We show that NFS1 encodes a nodulespecific cysteine-rich (NCR) peptide. In contrast to the known role of NCR peptides as effectors of endosymbionts’ differentiation to nitrogen-fixing bacteroids, we demonstrate that specific NCRs control discrimination against incompatible microsymbionts. NFS1 provokes bacterial cell death and early nodule senescence in an allele-specific and rhizobial strain-specific manner, and its function is dependent on host genetic background.

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Publisher

National Academy of Sciences

Subject

/ Biological Sciences

/ Cell death

/ Cloning